A systematic fitting scheme for caustic‐crossing microlensing events
Identifieur interne : 001F38 ( Istex/Corpus ); précédent : 001F37; suivant : 001F39A systematic fitting scheme for caustic‐crossing microlensing events
Auteurs : N. Kains ; A. Cassan ; K. Horne ; M. D. Albrow ; S. Dieters ; P. Fouqué ; J. Greenhill ; A. Udalski ; M. Zub ; D. P. Bennett ; M. Dominik ; J. Donatowicz ; D. Kubas ; Y. Tsapras ; T. Anguita ; V. Batista ; J. Beaulieu ; S. Brillant ; M. Bode ; D. M. Bramich ; M. Burgdorf ; J. A. R. Caldwell ; K. H. Cook ; Ch. Coutures ; D. Dominis Prester ; U. G. J Rgensen ; S. Kane ; J. B. Marquette ; R. Martin ; J. Menzies ; K. R. Pollard ; N. Rattenbury ; K. C. Sahu ; C. Snodgrass ; I. Steele ; C. Vinter ; J. Wambsganss ; A. Williams ; M. Kubiak ; G. Pietrzy Ski ; I. Soszy Ski ; O. Szewczyk ; M. K. Szyma Ski ; K. Ulaczyk ; Ł. WyrzykowskiSource :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2009-05-11.
English descriptors
- KwdEn :
- Acta astron, Algorithm, Angular radius, Basis functions, Best model, Binary, Binary system, Cassan, Caustic, Caustic crossings, Caustic entry, Caustic exit, Closest approach, Contour lines, Danish telescope, Data points, Data sets, Different parameters, Dominik, Error bars, Fractional distance, Galactic, Galactic bulge, Galactic centre, Galactic model, Genetic algorithm, Journal compilation, Lens, Lens components, Lens experiment, Lens mass, Lens velocity, Lensing, Lensing system, Light curve, Light curves, Lled circles, Local minima, Logarithmic scale, Mass ratio, Mcmc algorithm, Microlensing, Microlensing event, Microlensing events, Mnras, Model parameters, Modelling, Notre dame, Ogle, Ogle data, Parameter, Parameter space, Parametrization, Physical parameter distributions, Physical parameters, Physical properties, Possible models, Primary lens component, Primary mass, Probability densities, Rescaling factors, Source centre, Source magnitude, Source size, Tting, Tting approach, Tting process, Tting scheme, Uta.
- Teeft :
- Acta astron, Algorithm, Angular radius, Basis functions, Best model, Binary, Binary system, Cassan, Caustic, Caustic crossings, Caustic entry, Caustic exit, Closest approach, Contour lines, Danish telescope, Data points, Data sets, Different parameters, Dominik, Error bars, Fractional distance, Galactic, Galactic bulge, Galactic centre, Galactic model, Genetic algorithm, Journal compilation, Lens, Lens components, Lens experiment, Lens mass, Lens velocity, Lensing, Lensing system, Light curve, Light curves, Lled circles, Local minima, Logarithmic scale, Mass ratio, Mcmc algorithm, Microlensing, Microlensing event, Microlensing events, Mnras, Model parameters, Modelling, Notre dame, Ogle, Ogle data, Parameter, Parameter space, Parametrization, Physical parameter distributions, Physical parameters, Physical properties, Possible models, Primary lens component, Primary mass, Probability densities, Rescaling factors, Source centre, Source magnitude, Source size, Tting, Tting approach, Tting process, Tting scheme, Uta.
Abstract
We outline a method for fitting binary‐lens caustic‐crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE‐2007‐BLG‐472, a double‐peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low‐χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.
Url:
DOI: 10.1111/j.1365-2966.2009.14615.x
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ISTEX:A58495A9D89736795A70613A60FEB6D8FE0ABF1ELe document en format XML
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Cassan</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Horne, K" sort="Horne, K" uniqKey="Horne K" first="K." last="Horne">K. Horne</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</mods:affiliation></affiliation></author><author><name sortKey="Albrow, M D" sort="Albrow, M D" uniqKey="Albrow M" first="M. D." last="Albrow">M. D. 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Fouqué</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>LATT, Université de Toulouse, CNRS, 14 avenue Edouard Belin, F‐31400 Toulouse, France</mods:affiliation></affiliation></author><author><name sortKey="Greenhill, J" sort="Greenhill, J" uniqKey="Greenhill J" first="J." last="Greenhill">J. Greenhill</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia</mods:affiliation></affiliation></author><author><name sortKey="Udalski, A" sort="Udalski, A" uniqKey="Udalski A" first="A." last="Udalski">A. Udalski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Zub, M" sort="Zub, M" uniqKey="Zub M" first="M." last="Zub">M. Zub</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Bennett, D P" sort="Bennett, D P" uniqKey="Bennett D" first="D. P." last="Bennett">D. P. Bennett</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA</mods:affiliation></affiliation></author><author><name sortKey="Dominik, M" sort="Dominik, M" uniqKey="Dominik M" first="M." last="Dominik">M. Dominik</name><affiliation><mods:affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</mods:affiliation></affiliation></author><author><name sortKey="Donatowicz, J" sort="Donatowicz, J" uniqKey="Donatowicz J" first="J." last="Donatowicz">J. Donatowicz</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</mods:affiliation></affiliation></author><author><name sortKey="Kubas, D" sort="Kubas, D" uniqKey="Kubas D" first="D." last="Kubas">D. Kubas</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</mods:affiliation></affiliation></author><author><name sortKey="Tsapras, Y" sort="Tsapras, Y" uniqKey="Tsapras Y" first="Y." last="Tsapras">Y. Tsapras</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation></author><author><name sortKey="Anguita, T" sort="Anguita, T" uniqKey="Anguita T" first="T." last="Anguita">T. Anguita</name><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Batista, V" sort="Batista, V" uniqKey="Batista V" first="V." last="Batista">V. Batista</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Beaulieu, J" sort="Beaulieu, J" uniqKey="Beaulieu J" first="J." last="Beaulieu">J. Beaulieu</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Brillant, S" sort="Brillant, S" uniqKey="Brillant S" first="S." last="Brillant">S. Brillant</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</mods:affiliation></affiliation></author><author><name sortKey="Bode, M" sort="Bode, M" uniqKey="Bode M" first="M." last="Bode">M. Bode</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation></author><author><name sortKey="Bramich, D M" sort="Bramich, D M" uniqKey="Bramich D" first="D. M." last="Bramich">D. M. Bramich</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Isaac Newton Group of Telescopes, Apartado de Correos 321, E‐38700 Santa Cruz de La Palma, Spain</mods:affiliation></affiliation></author><author><name sortKey="Burgdorf, M" sort="Burgdorf, M" uniqKey="Burgdorf M" first="M." last="Burgdorf">M. Burgdorf</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation></author><author><name sortKey="Caldwell, J A R" sort="Caldwell, J A R" uniqKey="Caldwell J" first="J. A. R." last="Caldwell">J. A. R. Caldwell</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA</mods:affiliation></affiliation></author><author><name sortKey="Cook, K H" sort="Cook, K H" uniqKey="Cook K" first="K. H." last="Cook">K. H. Cook</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA</mods:affiliation></affiliation></author><author><name sortKey="Coutures, Ch" sort="Coutures, Ch" uniqKey="Coutures C" first="Ch." last="Coutures">Ch. Coutures</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>DSM/DAPNIA, CEA Saclay, 91191 Gif‐sur‐Yvette cedex, France</mods:affiliation></affiliation></author><author><name sortKey="Dominis Prester, D" sort="Dominis Prester, D" uniqKey="Dominis Prester D" first="D." last="Dominis Prester">D. Dominis Prester</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia</mods:affiliation></affiliation></author><author><name sortKey="J Rgensen, U G" sort="J Rgensen, U G" uniqKey="J Rgensen U" first="U. G." last="J Rgensen">U. G. J Rgensen</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</mods:affiliation></affiliation></author><author><name sortKey="Kane, S" sort="Kane, S" uniqKey="Kane S" first="S." last="Kane">S. Kane</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125, USA</mods:affiliation></affiliation></author><author><name sortKey="Marquette, J B" sort="Marquette, J B" uniqKey="Marquette J" first="J. B." last="Marquette">J. B. Marquette</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Martin, R" sort="Martin, R" uniqKey="Martin R" first="R." last="Martin">R. Martin</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</mods:affiliation></affiliation></author><author><name sortKey="Menzies, J" sort="Menzies, J" uniqKey="Menzies J" first="J." last="Menzies">J. Menzies</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation></affiliation></author><author><name sortKey="Pollard, K R" sort="Pollard, K R" uniqKey="Pollard K" first="K. R." last="Pollard">K. R. Pollard</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</mods:affiliation></affiliation></author><author><name sortKey="Rattenbury, N" sort="Rattenbury, N" uniqKey="Rattenbury N" first="N." last="Rattenbury">N. Rattenbury</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL</mods:affiliation></affiliation></author><author><name sortKey="Sahu, K C" sort="Sahu, K C" uniqKey="Sahu K" first="K. C." last="Sahu">K. C. Sahu</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA</mods:affiliation></affiliation></author><author><name sortKey="Snodgrass, C" sort="Snodgrass, C" uniqKey="Snodgrass C" first="C." last="Snodgrass">C. Snodgrass</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</mods:affiliation></affiliation></author><author><name sortKey="Steele, I" sort="Steele, I" uniqKey="Steele I" first="I." last="Steele">I. Steele</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</mods:affiliation></affiliation></author><author><name sortKey="Vinter, C" sort="Vinter, C" uniqKey="Vinter C" first="C." last="Vinter">C. Vinter</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</mods:affiliation></affiliation></author><author><name sortKey="Wambsganss, J" sort="Wambsganss, J" uniqKey="Wambsganss J" first="J." last="Wambsganss">J. Wambsganss</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Williams, A" sort="Williams, A" uniqKey="Williams A" first="A." last="Williams">A. Williams</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</mods:affiliation></affiliation></author><author><name sortKey="Kubiak, M" sort="Kubiak, M" uniqKey="Kubiak M" first="M." last="Kubiak">M. Kubiak</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Pietrzy Ski, G" sort="Pietrzy Ski, G" uniqKey="Pietrzy Ski G" first="G." last="Pietrzy Ski">G. Pietrzy Ski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation><affiliation><mods:affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</mods:affiliation></affiliation></author><author><name sortKey="Soszy Ski, I" sort="Soszy Ski, I" uniqKey="Soszy Ski I" first="I." last="Soszy Ski">I. Soszy Ski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Szewczyk, O" sort="Szewczyk, O" uniqKey="Szewczyk O" first="O." last="Szewczyk">O. Szewczyk</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation><affiliation><mods:affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</mods:affiliation></affiliation></author><author><name sortKey="Szyma Ski, M K" sort="Szyma Ski, M K" uniqKey="Szyma Ski M" first="M. K." last="Szyma Ski">M. K. Szyma Ski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Ulaczyk, K" sort="Ulaczyk, K" uniqKey="Ulaczyk K" first="K." last="Ulaczyk">K. Ulaczyk</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Wyrzykowski, L" sort="Wyrzykowski, L" uniqKey="Wyrzykowski L" first="Ł." last="Wyrzykowski">Ł. Wyrzykowski</name><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:A58495A9D89736795A70613A60FEB6D8FE0ABF1E</idno><date when="2009" year="2009">2009</date><idno type="doi">10.1111/j.1365-2966.2009.14615.x</idno><idno type="url">https://api.istex.fr/document/A58495A9D89736795A70613A60FEB6D8FE0ABF1E/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001F38</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001F38</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main">A systematic fitting scheme for caustic‐crossing microlensing events</title><author><name sortKey="Kains, N" sort="Kains, N" uniqKey="Kains N" first="N." last="Kains">N. Kains</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: nk87@st‐and.ac.uk</mods:affiliation></affiliation></author><author><name sortKey="Cassan, A" sort="Cassan, A" uniqKey="Cassan A" first="A." last="Cassan">A. Cassan</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Horne, K" sort="Horne, K" uniqKey="Horne K" first="K." last="Horne">K. Horne</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</mods:affiliation></affiliation></author><author><name sortKey="Albrow, M D" sort="Albrow, M D" uniqKey="Albrow M" first="M. D." last="Albrow">M. D. Albrow</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</mods:affiliation></affiliation></author><author><name sortKey="Dieters, S" sort="Dieters, S" uniqKey="Dieters S" first="S." last="Dieters">S. Dieters</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Fouque, P" sort="Fouque, P" uniqKey="Fouque P" first="P." last="Fouqué">P. Fouqué</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>LATT, Université de Toulouse, CNRS, 14 avenue Edouard Belin, F‐31400 Toulouse, France</mods:affiliation></affiliation></author><author><name sortKey="Greenhill, J" sort="Greenhill, J" uniqKey="Greenhill J" first="J." last="Greenhill">J. Greenhill</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia</mods:affiliation></affiliation></author><author><name sortKey="Udalski, A" sort="Udalski, A" uniqKey="Udalski A" first="A." last="Udalski">A. Udalski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Zub, M" sort="Zub, M" uniqKey="Zub M" first="M." last="Zub">M. Zub</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Bennett, D P" sort="Bennett, D P" uniqKey="Bennett D" first="D. P." last="Bennett">D. P. Bennett</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA</mods:affiliation></affiliation></author><author><name sortKey="Dominik, M" sort="Dominik, M" uniqKey="Dominik M" first="M." last="Dominik">M. Dominik</name><affiliation><mods:affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</mods:affiliation></affiliation></author><author><name sortKey="Donatowicz, J" sort="Donatowicz, J" uniqKey="Donatowicz J" first="J." last="Donatowicz">J. Donatowicz</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</mods:affiliation></affiliation></author><author><name sortKey="Kubas, D" sort="Kubas, D" uniqKey="Kubas D" first="D." last="Kubas">D. Kubas</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</mods:affiliation></affiliation></author><author><name sortKey="Tsapras, Y" sort="Tsapras, Y" uniqKey="Tsapras Y" first="Y." last="Tsapras">Y. Tsapras</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation></author><author><name sortKey="Anguita, T" sort="Anguita, T" uniqKey="Anguita T" first="T." last="Anguita">T. Anguita</name><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Batista, V" sort="Batista, V" uniqKey="Batista V" first="V." last="Batista">V. Batista</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Beaulieu, J" sort="Beaulieu, J" uniqKey="Beaulieu J" first="J." last="Beaulieu">J. Beaulieu</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Brillant, S" sort="Brillant, S" uniqKey="Brillant S" first="S." last="Brillant">S. Brillant</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</mods:affiliation></affiliation></author><author><name sortKey="Bode, M" sort="Bode, M" uniqKey="Bode M" first="M." last="Bode">M. Bode</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation></author><author><name sortKey="Bramich, D M" sort="Bramich, D M" uniqKey="Bramich D" first="D. M." last="Bramich">D. M. Bramich</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Isaac Newton Group of Telescopes, Apartado de Correos 321, E‐38700 Santa Cruz de La Palma, Spain</mods:affiliation></affiliation></author><author><name sortKey="Burgdorf, M" sort="Burgdorf, M" uniqKey="Burgdorf M" first="M." last="Burgdorf">M. Burgdorf</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation></author><author><name sortKey="Caldwell, J A R" sort="Caldwell, J A R" uniqKey="Caldwell J" first="J. A. R." last="Caldwell">J. A. R. Caldwell</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA</mods:affiliation></affiliation></author><author><name sortKey="Cook, K H" sort="Cook, K H" uniqKey="Cook K" first="K. H." last="Cook">K. H. Cook</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA</mods:affiliation></affiliation></author><author><name sortKey="Coutures, Ch" sort="Coutures, Ch" uniqKey="Coutures C" first="Ch." last="Coutures">Ch. Coutures</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>DSM/DAPNIA, CEA Saclay, 91191 Gif‐sur‐Yvette cedex, France</mods:affiliation></affiliation></author><author><name sortKey="Dominis Prester, D" sort="Dominis Prester, D" uniqKey="Dominis Prester D" first="D." last="Dominis Prester">D. Dominis Prester</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia</mods:affiliation></affiliation></author><author><name sortKey="J Rgensen, U G" sort="J Rgensen, U G" uniqKey="J Rgensen U" first="U. G." last="J Rgensen">U. G. J Rgensen</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</mods:affiliation></affiliation></author><author><name sortKey="Kane, S" sort="Kane, S" uniqKey="Kane S" first="S." last="Kane">S. Kane</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125, USA</mods:affiliation></affiliation></author><author><name sortKey="Marquette, J B" sort="Marquette, J B" uniqKey="Marquette J" first="J. B." last="Marquette">J. B. Marquette</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Martin, R" sort="Martin, R" uniqKey="Martin R" first="R." last="Martin">R. Martin</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</mods:affiliation></affiliation></author><author><name sortKey="Menzies, J" sort="Menzies, J" uniqKey="Menzies J" first="J." last="Menzies">J. Menzies</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation></affiliation></author><author><name sortKey="Pollard, K R" sort="Pollard, K R" uniqKey="Pollard K" first="K. R." last="Pollard">K. R. Pollard</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</mods:affiliation></affiliation></author><author><name sortKey="Rattenbury, N" sort="Rattenbury, N" uniqKey="Rattenbury N" first="N." last="Rattenbury">N. Rattenbury</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL</mods:affiliation></affiliation></author><author><name sortKey="Sahu, K C" sort="Sahu, K C" uniqKey="Sahu K" first="K. C." last="Sahu">K. C. Sahu</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA</mods:affiliation></affiliation></author><author><name sortKey="Snodgrass, C" sort="Snodgrass, C" uniqKey="Snodgrass C" first="C." last="Snodgrass">C. Snodgrass</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</mods:affiliation></affiliation></author><author><name sortKey="Steele, I" sort="Steele, I" uniqKey="Steele I" first="I." last="Steele">I. Steele</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</mods:affiliation></affiliation></author><author><name sortKey="Vinter, C" sort="Vinter, C" uniqKey="Vinter C" first="C." last="Vinter">C. Vinter</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</mods:affiliation></affiliation></author><author><name sortKey="Wambsganss, J" sort="Wambsganss, J" uniqKey="Wambsganss J" first="J." last="Wambsganss">J. Wambsganss</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</mods:affiliation></affiliation></author><author><name sortKey="Williams, A" sort="Williams, A" uniqKey="Williams A" first="A." last="Williams">A. Williams</name><affiliation><mods:affiliation>PLANET/RoboNet Collaborations</mods:affiliation></affiliation><affiliation><mods:affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</mods:affiliation></affiliation></author><author><name sortKey="Kubiak, M" sort="Kubiak, M" uniqKey="Kubiak M" first="M." last="Kubiak">M. Kubiak</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Pietrzy Ski, G" sort="Pietrzy Ski, G" uniqKey="Pietrzy Ski G" first="G." last="Pietrzy Ski">G. Pietrzy Ski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation><affiliation><mods:affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</mods:affiliation></affiliation></author><author><name sortKey="Soszy Ski, I" sort="Soszy Ski, I" uniqKey="Soszy Ski I" first="I." last="Soszy Ski">I. Soszy Ski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Szewczyk, O" sort="Szewczyk, O" uniqKey="Szewczyk O" first="O." last="Szewczyk">O. Szewczyk</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation><affiliation><mods:affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</mods:affiliation></affiliation></author><author><name sortKey="Szyma Ski, M K" sort="Szyma Ski, M K" uniqKey="Szyma Ski M" first="M. K." last="Szyma Ski">M. K. Szyma Ski</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Ulaczyk, K" sort="Ulaczyk, K" uniqKey="Ulaczyk K" first="K." last="Ulaczyk">K. Ulaczyk</name><affiliation><mods:affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</mods:affiliation></affiliation><affiliation><mods:affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</mods:affiliation></affiliation></author><author><name sortKey="Wyrzykowski, L" sort="Wyrzykowski, L" uniqKey="Wyrzykowski L" first="Ł." last="Wyrzykowski">Ł. Wyrzykowski</name><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</mods:affiliation></affiliation><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><biblScope unit="vol">395</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="787">787</biblScope><biblScope unit="page" to="796">796</biblScope><biblScope unit="page-count">10</biblScope><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-05-11">2009-05-11</date></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acta astron</term><term>Algorithm</term><term>Angular radius</term><term>Basis functions</term><term>Best model</term><term>Binary</term><term>Binary system</term><term>Cassan</term><term>Caustic</term><term>Caustic crossings</term><term>Caustic entry</term><term>Caustic exit</term><term>Closest approach</term><term>Contour lines</term><term>Danish telescope</term><term>Data points</term><term>Data sets</term><term>Different parameters</term><term>Dominik</term><term>Error bars</term><term>Fractional distance</term><term>Galactic</term><term>Galactic bulge</term><term>Galactic centre</term><term>Galactic model</term><term>Genetic algorithm</term><term>Journal compilation</term><term>Lens</term><term>Lens components</term><term>Lens experiment</term><term>Lens mass</term><term>Lens velocity</term><term>Lensing</term><term>Lensing system</term><term>Light curve</term><term>Light curves</term><term>Lled circles</term><term>Local minima</term><term>Logarithmic scale</term><term>Mass ratio</term><term>Mcmc algorithm</term><term>Microlensing</term><term>Microlensing event</term><term>Microlensing events</term><term>Mnras</term><term>Model parameters</term><term>Modelling</term><term>Notre dame</term><term>Ogle</term><term>Ogle data</term><term>Parameter</term><term>Parameter space</term><term>Parametrization</term><term>Physical parameter distributions</term><term>Physical parameters</term><term>Physical properties</term><term>Possible models</term><term>Primary lens component</term><term>Primary mass</term><term>Probability densities</term><term>Rescaling factors</term><term>Source centre</term><term>Source magnitude</term><term>Source size</term><term>Tting</term><term>Tting approach</term><term>Tting process</term><term>Tting scheme</term><term>Uta</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Acta astron</term><term>Algorithm</term><term>Angular radius</term><term>Basis functions</term><term>Best model</term><term>Binary</term><term>Binary system</term><term>Cassan</term><term>Caustic</term><term>Caustic crossings</term><term>Caustic entry</term><term>Caustic exit</term><term>Closest approach</term><term>Contour lines</term><term>Danish telescope</term><term>Data points</term><term>Data sets</term><term>Different parameters</term><term>Dominik</term><term>Error bars</term><term>Fractional distance</term><term>Galactic</term><term>Galactic bulge</term><term>Galactic centre</term><term>Galactic model</term><term>Genetic algorithm</term><term>Journal compilation</term><term>Lens</term><term>Lens components</term><term>Lens experiment</term><term>Lens mass</term><term>Lens velocity</term><term>Lensing</term><term>Lensing system</term><term>Light curve</term><term>Light curves</term><term>Lled circles</term><term>Local minima</term><term>Logarithmic scale</term><term>Mass ratio</term><term>Mcmc algorithm</term><term>Microlensing</term><term>Microlensing event</term><term>Microlensing events</term><term>Mnras</term><term>Model parameters</term><term>Modelling</term><term>Notre dame</term><term>Ogle</term><term>Ogle data</term><term>Parameter</term><term>Parameter space</term><term>Parametrization</term><term>Physical parameter distributions</term><term>Physical parameters</term><term>Physical properties</term><term>Possible models</term><term>Primary lens component</term><term>Primary mass</term><term>Probability densities</term><term>Rescaling factors</term><term>Source centre</term><term>Source magnitude</term><term>Source size</term><term>Tting</term><term>Tting approach</term><term>Tting process</term><term>Tting scheme</term><term>Uta</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We outline a method for fitting binary‐lens caustic‐crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE‐2007‐BLG‐472, a double‐peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low‐χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.</div></front></TEI><istex><corpusName>wiley</corpusName><keywords><teeft><json:string>caustic</json:string><json:string>parameter space</json:string><json:string>microlensing</json:string><json:string>tting</json:string><json:string>ogle</json:string><json:string>mnras</json:string><json:string>dominik</json:string><json:string>light curve</json:string><json:string>cassan</json:string><json:string>journal compilation</json:string><json:string>modelling</json:string><json:string>uta</json:string><json:string>parametrization</json:string><json:string>lensing</json:string><json:string>binary</json:string><json:string>physical properties</json:string><json:string>probability densities</json:string><json:string>caustic entry</json:string><json:string>microlensing events</json:string><json:string>mass ratio</json:string><json:string>galactic</json:string><json:string>best model</json:string><json:string>caustic exit</json:string><json:string>error bars</json:string><json:string>data sets</json:string><json:string>algorithm</json:string><json:string>parameter</json:string><json:string>lled circles</json:string><json:string>galactic model</json:string><json:string>lensing system</json:string><json:string>possible models</json:string><json:string>danish telescope</json:string><json:string>model parameters</json:string><json:string>data points</json:string><json:string>tting process</json:string><json:string>physical parameters</json:string><json:string>source size</json:string><json:string>light curves</json:string><json:string>lens components</json:string><json:string>closest approach</json:string><json:string>local minima</json:string><json:string>genetic algorithm</json:string><json:string>microlensing event</json:string><json:string>caustic crossings</json:string><json:string>ogle data</json:string><json:string>basis functions</json:string><json:string>acta astron</json:string><json:string>notre dame</json:string><json:string>rescaling factors</json:string><json:string>contour lines</json:string><json:string>tting scheme</json:string><json:string>tting approach</json:string><json:string>binary system</json:string><json:string>mcmc algorithm</json:string><json:string>source magnitude</json:string><json:string>physical parameter distributions</json:string><json:string>fractional distance</json:string><json:string>angular radius</json:string><json:string>primary lens component</json:string><json:string>logarithmic scale</json:string><json:string>galactic centre</json:string><json:string>lens experiment</json:string><json:string>galactic bulge</json:string><json:string>primary mass</json:string><json:string>lens velocity</json:string><json:string>different parameters</json:string><json:string>lens mass</json:string><json:string>source centre</json:string><json:string>lens</json:string></teeft></keywords><author><json:item><name>N. Kains</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</json:string><json:string>E-mail: nk87@st‐and.ac.uk</json:string></affiliations></json:item><json:item><name>A. Cassan</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</json:string></affiliations></json:item><json:item><name>K. Horne</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</json:string></affiliations></json:item><json:item><name>M. D. Albrow</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</json:string></affiliations></json:item><json:item><name>S. Dieters</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</json:string></affiliations></json:item><json:item><name>P. Fouqué</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>LATT, Université de Toulouse, CNRS, 14 avenue Edouard Belin, F‐31400 Toulouse, France</json:string></affiliations></json:item><json:item><name>J. Greenhill</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia</json:string></affiliations></json:item><json:item><name>A. Udalski</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string></affiliations></json:item><json:item><name>M. Zub</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</json:string></affiliations></json:item><json:item><name>D. P. Bennett</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA</json:string></affiliations></json:item><json:item><name>M. Dominik</name><affiliations><json:string>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</json:string></affiliations></json:item><json:item><name>J. Donatowicz</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</json:string></affiliations></json:item><json:item><name>D. Kubas</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</json:string></affiliations></json:item><json:item><name>Y. Tsapras</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</json:string></affiliations></json:item><json:item><name>T. Anguita</name><affiliations><json:string>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</json:string></affiliations></json:item><json:item><name>V. Batista</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</json:string></affiliations></json:item><json:item><name>J.‐P. Beaulieu</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</json:string></affiliations></json:item><json:item><name>S. Brillant</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</json:string></affiliations></json:item><json:item><name>M. Bode</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</json:string></affiliations></json:item><json:item><name>D. M. 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Cook</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA</json:string></affiliations></json:item><json:item><name>Ch. Coutures</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>DSM/DAPNIA, CEA Saclay, 91191 Gif‐sur‐Yvette cedex, France</json:string></affiliations></json:item><json:item><name>D. Dominis Prester</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia</json:string></affiliations></json:item><json:item><name>U. G. Jørgensen</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</json:string></affiliations></json:item><json:item><name>S. Kane</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125, USA</json:string></affiliations></json:item><json:item><name>J. B. Marquette</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</json:string></affiliations></json:item><json:item><name>R. Martin</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</json:string></affiliations></json:item><json:item><name>J. Menzies</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</json:string></affiliations></json:item><json:item><name>K. R. Pollard</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</json:string></affiliations></json:item><json:item><name>N. Rattenbury</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL</json:string></affiliations></json:item><json:item><name>K. C. Sahu</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA</json:string></affiliations></json:item><json:item><name>C. Snodgrass</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</json:string></affiliations></json:item><json:item><name>I. Steele</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</json:string></affiliations></json:item><json:item><name>C. Vinter</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</json:string></affiliations></json:item><json:item><name>J. Wambsganss</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</json:string></affiliations></json:item><json:item><name>A. Williams</name><affiliations><json:string>PLANET/RoboNet Collaborations</json:string><json:string>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</json:string></affiliations></json:item><json:item><name>M. Kubiak</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string></affiliations></json:item><json:item><name>G. Pietrzyński</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string><json:string>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</json:string></affiliations></json:item><json:item><name>I. Soszyński</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string></affiliations></json:item><json:item><name>O. Szewczyk</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string><json:string>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</json:string></affiliations></json:item><json:item><name>M. K. Szymański</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string></affiliations></json:item><json:item><name>K. Ulaczyk</name><affiliations><json:string>Optical Gravitational Lens Experiment (OGLE) Collaboration</json:string><json:string>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</json:string></affiliations></json:item><json:item><name>Ł. Wyrzykowski</name><affiliations><json:string>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</json:string><json:string>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>gravitational lensing</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>methods: miscellaneous</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>binaries: general</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>planetary systems</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Galaxy: bulge</value></json:item></subject><articleId><json:string>MNR14615</json:string></articleId><arkIstex>ark:/67375/WNG-MF2DW5XM-8</arkIstex><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>We outline a method for fitting binary‐lens caustic‐crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE‐2007‐BLG‐472, a double‐peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low‐χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.</abstract><qualityIndicators><refBibsNative>true</refBibsNative><abstractWordCount>144</abstractWordCount><abstractCharCount>931</abstractCharCount><keywordCount>5</keywordCount><score>8.728</score><pdfWordCount>6256</pdfWordCount><pdfCharCount>33689</pdfCharCount><pdfVersion>1.4</pdfVersion><pdfPageCount>10</pdfPageCount><pdfPageSize>595.274 x 782.286 pts</pdfPageSize></qualityIndicators><title>A systematic fitting scheme for caustic‐crossing microlensing events</title><genre><json:string>article</json:string></genre><host><title>Monthly Notices of the Royal Astronomical Society</title><language><json:string>unknown</json:string></language><doi><json:string>10.1111/(ISSN)1365-2966</json:string></doi><issn><json:string>0035-8711</json:string></issn><eissn><json:string>1365-2966</json:string></eissn><publisherId><json:string>MNR</json:string></publisherId><volume>395</volume><issue>2</issue><pages><first>787</first><last>796</last><total>10</total></pages><genre><json:string>journal</json:string></genre></host><namedEntities><unitex><date><json:string>2009</json:string><json:string>2007</json:string><json:string>2003</json:string><json:string>2008</json:string></date><geogName></geogName><orgName><json:string>Lawrence Livermore National Laboratory, IGPP, PO Box</json:string><json:string>University of Canterbury</json:string><json:string>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB</json:string><json:string>Heidelberg University</json:string><json:string>Astrophysics Research Institute, Liverpool John Moores University</json:string><json:string>Royal Society University Research Fellow</json:string><json:string>Warsaw University</json:string><json:string>International Max Planck Research School for Astronomy and Cosmic Physics</json:string><json:string>Department of Physics and Astronomy</json:string><json:string>University of Heidelberg</json:string><json:string>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej</json:string><json:string>University of Manchester</json:string><json:string>Department of Physics, University of Notre Dame</json:string><json:string>Department of Computing, Technical University of Vienna, Wiedner Hauptstr</json:string><json:string>Exoplanet Science Institute, Caltech, MS</json:string><json:string>Physics Department, Faculty of Arts and Sciences</json:string><json:string>University of Rijeka</json:string><json:string>University of Tasmania</json:string></orgName><orgName_funder></orgName_funder><orgName_provider></orgName_provider><persName><json:string>A. 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Kains et al.</json:string><json:string>Dominik 2006</json:string><json:string>Dominik 1998</json:string><json:string>Holtzman et al. 1998</json:string><json:string>Kubas et al. (2005)</json:string><json:string>Holtzman et al. 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Journal compilation © 2009 RAS</licence></availability><date type="published" when="2009-05-11"></date></publicationStmt><notesStmt><note type="content-type" subtype="article" source="article" scheme="https://content-type.data.istex.fr/ark:/67375/XTP-6N5SZHKN-D">article</note><note type="publication-type" subtype="journal" scheme="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</note></notesStmt><sourceDesc><biblStruct type="article"><analytic><title level="a" type="main">A systematic fitting scheme for caustic‐crossing microlensing events</title><title level="a" type="short">Systematic fitting of microlensing events</title><author xml:id="author-0000" role="corresp"><persName><forename type="first">N.</forename><surname>Kains</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</affiliation><affiliation>E‐mail: nk87@st‐and.ac.uk</affiliation></author><author xml:id="author-0001"><persName><forename type="first">A.</forename><surname>Cassan</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany<address><country key="DE"></country></address></affiliation></author><author xml:id="author-0002"><persName><forename type="first">K.</forename><surname>Horne</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</affiliation></author><author xml:id="author-0003"><persName><forename type="first">M. 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Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation></author><author xml:id="author-0008"><persName><forename type="first">M.</forename><surname>Zub</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany<address><country key="DE"></country></address></affiliation><note type="foot">Member of International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg.</note></author><author xml:id="author-0009"><persName><forename type="first">D. P.</forename><surname>Bennett</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA<address><country key="US"></country></address></affiliation></author><author xml:id="author-0010"><persName><forename type="first">M.</forename><surname>Dominik</surname></persName><affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</affiliation><note type="foot">Royal Society University Research Fellow.</note></author><author xml:id="author-0011"><persName><forename type="first">J.</forename><surname>Donatowicz</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria<address><country key="AT"></country></address></affiliation></author><author xml:id="author-0012"><persName><forename type="first">D.</forename><surname>Kubas</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile<address><country key="CL"></country></address></affiliation></author><author xml:id="author-0013"><persName><forename type="first">Y.</forename><surname>Tsapras</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</affiliation></author><author xml:id="author-0014"><persName><forename type="first">T.</forename><surname>Anguita</surname></persName><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany<address><country key="DE"></country></address></affiliation></author><author xml:id="author-0015"><persName><forename type="first">V.</forename><surname>Batista</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France<address><country key="FR"></country></address></affiliation></author><author xml:id="author-0016"><persName><forename type="first">J.‐P.</forename><surname>Beaulieu</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France<address><country key="FR"></country></address></affiliation></author><author xml:id="author-0017"><persName><forename type="first">S.</forename><surname>Brillant</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile<address><country key="CL"></country></address></affiliation></author><author xml:id="author-0018"><persName><forename type="first">M.</forename><surname>Bode</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</affiliation></author><author xml:id="author-0019"><persName><forename type="first">D. M.</forename><surname>Bramich</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Isaac Newton Group of Telescopes, Apartado de Correos 321, E‐38700 Santa Cruz de La Palma, Spain<address><country key="ES"></country></address></affiliation></author><author xml:id="author-0020"><persName><forename type="first">M.</forename><surname>Burgdorf</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</affiliation></author><author xml:id="author-0021"><persName><forename type="first">J. A. R.</forename><surname>Caldwell</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA<address><country key="US"></country></address></affiliation></author><author xml:id="author-0022"><persName><forename type="first">K. H.</forename><surname>Cook</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA<address><country key="US"></country></address></affiliation></author><author xml:id="author-0023"><persName><forename type="first">Ch.</forename><surname>Coutures</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>DSM/DAPNIA, CEA Saclay, 91191 Gif‐sur‐Yvette cedex, France<address><country key="FR"></country></address></affiliation></author><author xml:id="author-0024"><persName><forename type="first">D.</forename><surname>Dominis Prester</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia<address><country key="HR"></country></address></affiliation></author><author xml:id="author-0025"><persName><forename type="first">U. G.</forename><surname>Jørgensen</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark<address><country key="DK"></country></address></affiliation></author><author xml:id="author-0026"><persName><forename type="first">S.</forename><surname>Kane</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125, USA<address><country key="US"></country></address></affiliation></author><author xml:id="author-0027"><persName><forename type="first">J. 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R.</forename><surname>Pollard</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand<address><country key="NZ"></country></address></affiliation></author><author xml:id="author-0031"><persName><forename type="first">N.</forename><surname>Rattenbury</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL</affiliation></author><author xml:id="author-0032"><persName><forename type="first">K. C.</forename><surname>Sahu</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA<address><country key="US"></country></address></affiliation></author><author xml:id="author-0033"><persName><forename type="first">C.</forename><surname>Snodgrass</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile<address><country key="CL"></country></address></affiliation></author><author xml:id="author-0034"><persName><forename type="first">I.</forename><surname>Steele</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria<address><country key="AT"></country></address></affiliation></author><author xml:id="author-0035"><persName><forename type="first">C.</forename><surname>Vinter</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark<address><country key="DK"></country></address></affiliation></author><author xml:id="author-0036"><persName><forename type="first">J.</forename><surname>Wambsganss</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany<address><country key="DE"></country></address></affiliation></author><author xml:id="author-0037"><persName><forename type="first">A.</forename><surname>Williams</surname></persName><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia<address><country key="AU"></country></address></affiliation></author><author xml:id="author-0038"><persName><forename type="first">M.</forename><surname>Kubiak</surname></persName><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation></author><author xml:id="author-0039"><persName><forename type="first">G.</forename><surname>Pietrzyński</surname></persName><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation><affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile<address><country key="CL"></country></address></affiliation></author><author xml:id="author-0040"><persName><forename type="first">I.</forename><surname>Soszyński</surname></persName><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation></author><author xml:id="author-0041"><persName><forename type="first">O.</forename><surname>Szewczyk</surname></persName><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation><affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile<address><country key="CL"></country></address></affiliation></author><author xml:id="author-0042"><persName><forename type="first">M. K.</forename><surname>Szymański</surname></persName><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation></author><author xml:id="author-0043"><persName><forename type="first">K.</forename><surname>Ulaczyk</surname></persName><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland<address><country key="PL"></country></address></affiliation></author><author xml:id="author-0044"><persName><forename type="first">Ł.</forename><surname>Wyrzykowski</surname></persName><affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</affiliation><affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</affiliation></author><idno type="istex">A58495A9D89736795A70613A60FEB6D8FE0ABF1E</idno><idno type="ark">ark:/67375/WNG-MF2DW5XM-8</idno><idno type="DOI">10.1111/j.1365-2966.2009.14615.x</idno><idno type="unit">MNR14615</idno><idno type="toTypesetVersion">file:MNR.MNR14615.pdf</idno></analytic><monogr><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="pISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><idno type="book-DOI">10.1111/(ISSN)1365-2966</idno><idno type="book-part-DOI">10.1111/mnr.2009.395.issue-2</idno><idno type="product">MNR</idno><idno type="publisherDivision">ST</idno><imprint><biblScope unit="vol">395</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="787">787</biblScope><biblScope unit="page" to="796">796</biblScope><biblScope unit="page-count">10</biblScope><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-05-11"></date></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><abstract xml:lang="en" style="main"><head>ABSTRACT</head><p>We outline a method for fitting binary‐lens caustic‐crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE‐2007‐BLG‐472, a double‐peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low‐<emph><span>χ<hi rend="superscript">2</hi></span></emph> regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.</p></abstract><textClass><keywords xml:lang="en"><term xml:id="k1">gravitational lensing</term><term xml:id="k2">methods: miscellaneous</term><term xml:id="k3">binaries: general</term><term xml:id="k4">planetary systems</term><term xml:id="k5">Galaxy: bulge</term></keywords><keywords rend="tocHeading1"><term>Papers</term></keywords></textClass><langUsage><language ident="en"></language></langUsage></profileDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/A58495A9D89736795A70613A60FEB6D8FE0ABF1E/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1365-2966</doi><issn type="print">0035-8711</issn><issn type="electronic">1365-2966</issn><idGroup><id type="product" value="MNR"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY">Monthly Notices of the Royal Astronomical Society</title></titleGroup></publicationMeta><publicationMeta level="part" position="05002"><doi origin="wiley">10.1111/mnr.2009.395.issue-2</doi><numberingGroup><numbering type="journalVolume" number="395">395</numbering><numbering type="journalIssue" number="2">2</numbering></numberingGroup><coverDate startDate="2009-05-11">May 2009</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="15" status="forIssue"><doi origin="wiley">10.1111/j.1365-2966.2009.14615.x</doi><idGroup><id type="unit" value="MNR14615"></id></idGroup><countGroup><count type="pageTotal" number="10"></count></countGroup><titleGroup><title type="tocHeading1">Papers</title></titleGroup><copyright>© 2009 The Authors. Journal compilation © 2009 RAS</copyright><eventGroup><event type="firstOnline" date="2009-04-08"></event><event type="publishedOnlineFinalForm" date="2009-04-24"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.6 mode:FullText source:FullText result:FullText" date="2010-04-21"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-02-02"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-31"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="787">787</numbering><numbering type="pageLast" number="796">796</numbering></numberingGroup><correspondenceTo>
E‐mail: <email normalForm="nk87@st-and.ac.uk">nk87@st‐and.ac.uk</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:MNR.MNR14615.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Accepted 2009 February 9. Received 2009 February 9; in original form 2008 November 12</unparsedEditorialHistory><countGroup><count type="figureTotal" number="11"></count><count type="tableTotal" number="2"></count><count type="formulaTotal" number="209"></count><count type="referenceTotal" number="26"></count><count type="linksCrossRef" number="128"></count></countGroup><titleGroup><title type="main">A systematic fitting scheme for caustic‐crossing microlensing events</title><title type="shortAuthors"><i>N. Kains et al.</i></title><title type="short"><i>Systematic fitting of microlensing events</i></title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1 #a2" corresponding="yes"><personName><givenNames>N.</givenNames><familyName>Kains</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a1 #a3"><personName><givenNames>A.</givenNames><familyName>Cassan</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a1 #a2"><personName><givenNames>K.</givenNames><familyName>Horne</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a1 #a4"><personName><givenNames>M. 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Ujazdowskie 4, 00‐478 Warszawa, Poland</unparsedAffiliation></affiliation><affiliation xml:id="a10" countryCode="US"><unparsedAffiliation>Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA</unparsedAffiliation></affiliation><affiliation xml:id="a11" countryCode="AT"><unparsedAffiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</unparsedAffiliation></affiliation><affiliation xml:id="a12" countryCode="CL"><unparsedAffiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</unparsedAffiliation></affiliation><affiliation xml:id="a13"><unparsedAffiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</unparsedAffiliation></affiliation><affiliation xml:id="a14" countryCode="ES"><unparsedAffiliation>Isaac Newton Group of Telescopes, Apartado de Correos 321, E‐38700 Santa Cruz de La Palma, Spain</unparsedAffiliation></affiliation><affiliation xml:id="a15" countryCode="US"><unparsedAffiliation>McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA</unparsedAffiliation></affiliation><affiliation xml:id="a16" countryCode="US"><unparsedAffiliation>Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA</unparsedAffiliation></affiliation><affiliation xml:id="a17" countryCode="FR"><unparsedAffiliation>DSM/DAPNIA, CEA Saclay, 91191 Gif‐sur‐Yvette cedex, France</unparsedAffiliation></affiliation><affiliation xml:id="a18" countryCode="HR"><unparsedAffiliation>Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia</unparsedAffiliation></affiliation><affiliation xml:id="a19" countryCode="DK"><unparsedAffiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</unparsedAffiliation></affiliation><affiliation xml:id="a20" countryCode="US"><unparsedAffiliation>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125, USA</unparsedAffiliation></affiliation><affiliation xml:id="a21" countryCode="AU"><unparsedAffiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</unparsedAffiliation></affiliation><affiliation xml:id="a22" countryCode="ZA"><unparsedAffiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</unparsedAffiliation></affiliation><affiliation xml:id="a23"><unparsedAffiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL</unparsedAffiliation></affiliation><affiliation xml:id="a24" countryCode="US"><unparsedAffiliation>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA</unparsedAffiliation></affiliation><affiliation xml:id="a25" countryCode="CL"><unparsedAffiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</unparsedAffiliation></affiliation><affiliation xml:id="a26"><unparsedAffiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">gravitational lensing</keyword><keyword xml:id="k2">methods: miscellaneous</keyword><keyword xml:id="k3">binaries: general</keyword><keyword xml:id="k4">planetary systems</keyword><keyword xml:id="k5">Galaxy: bulge</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">ABSTRACT</title><p>We outline a method for fitting binary‐lens caustic‐crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE‐2007‐BLG‐472, a double‐peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low‐<span type="mathematics">χ<sup>2</sup></span> regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.</p></abstract></abstractGroup></contentMeta><noteGroup><note xml:id="fn3"><label>†</label><p>Member of International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg.</p></note><note xml:id="fn4"><label>‡</label><p>Royal Society University Research Fellow.</p></note></noteGroup></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>A systematic fitting scheme for caustic‐crossing microlensing events</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Systematic fitting of microlensing events</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>A systematic fitting scheme for caustic‐crossing microlensing events</title></titleInfo><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Kains</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</affiliation><affiliation>E-mail: nk87@st‐and.ac.uk</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Cassan</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K.</namePart><namePart type="family">Horne</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews KY16 9SS</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M. D.</namePart><namePart type="family">Albrow</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">Dieters</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">P.</namePart><namePart type="family">Fouqué</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>LATT, Université de Toulouse, CNRS, 14 avenue Edouard Belin, F‐31400 Toulouse, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Greenhill</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Udalski</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Zub</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</affiliation><description>Member of International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg.</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D. 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M.</namePart><namePart type="family">Bramich</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Isaac Newton Group of Telescopes, Apartado de Correos 321, E‐38700 Santa Cruz de La Palma, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Burgdorf</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. A. R.</namePart><namePart type="family">Caldwell</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K. H.</namePart><namePart type="family">Cook</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Ch.</namePart><namePart type="family">Coutures</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>DSM/DAPNIA, CEA Saclay, 91191 Gif‐sur‐Yvette cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D.</namePart><namePart type="family">Dominis Prester</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Physics Department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">U. G.</namePart><namePart type="family">Jørgensen</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">Kane</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. B.</namePart><namePart type="family">Marquette</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Boulevard Arago, 75014 Paris, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R.</namePart><namePart type="family">Martin</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Menzies</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K. R.</namePart><namePart type="family">Pollard</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Rattenbury</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K. C.</namePart><namePart type="family">Sahu</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Snodgrass</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">I.</namePart><namePart type="family">Steele</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Department of Computing, Technical University of Vienna, Wiedner Hauptstr. 10, Vienna A‐1040, Austria</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Vinter</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, DK‐2100 Copenhagen, Denmark</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Wambsganss</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Astronomisches Rechen‐Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University, Mönchhofstraße 12‐14, 69120 Heidelberg, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Williams</namePart><affiliation>PLANET/RoboNet Collaborations</affiliation><affiliation>Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Kubiak</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G.</namePart><namePart type="family">Pietrzyński</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">I.</namePart><namePart type="family">Soszyński</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">O.</namePart><namePart type="family">Szewczyk</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><affiliation>Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160‐C, Concepción, Chile</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M. K.</namePart><namePart type="family">Szymański</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K.</namePart><namePart type="family">Ulaczyk</namePart><affiliation>Optical Gravitational Lens Experiment (OGLE) Collaboration</affiliation><affiliation>Warsaw University Observatory, Al. Ujazdowskie 4, 00‐478 Warszawa, Poland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Ł.</namePart><namePart type="family">Wyrzykowski</namePart><affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD</affiliation><affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-6N5SZHKN-D">article</genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2009-05-11</dateIssued><edition>Accepted 2009 February 9. Received 2009 February 9; in original form 2008 November 12</edition><copyrightDate encoding="w3cdtf">2009</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><extent unit="figures">11</extent><extent unit="tables">2</extent><extent unit="formulas">209</extent><extent unit="references">26</extent><extent unit="linksCrossRef">128</extent></physicalDescription><abstract lang="en">We outline a method for fitting binary‐lens caustic‐crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE‐2007‐BLG‐472, a double‐peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low‐χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event.</abstract><subject lang="en"><genre>keywords</genre><topic>gravitational lensing</topic><topic>methods: miscellaneous</topic><topic>binaries: general</topic><topic>planetary systems</topic><topic>Galaxy: bulge</topic></subject><relatedItem type="host"><titleInfo><title>Monthly Notices of the Royal Astronomical Society</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><identifier type="ISSN">0035-8711</identifier><identifier type="eISSN">1365-2966</identifier><identifier type="DOI">10.1111/(ISSN)1365-2966</identifier><identifier type="PublisherID">MNR</identifier><part><date>2009</date><detail type="volume"><caption>vol.</caption><number>395</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>787</start><end>796</end><total>10</total></extent></part></relatedItem><identifier type="istex">A58495A9D89736795A70613A60FEB6D8FE0ABF1E</identifier><identifier type="ark">ark:/67375/WNG-MF2DW5XM-8</identifier><identifier type="DOI">10.1111/j.1365-2966.2009.14615.x</identifier><identifier type="ArticleID">MNR14615</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2009 The Authors. 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