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Difference imaging photometry of blended gravitational microlensing events with a numerical kernel

Identifieur interne : 002C00 ( PascalFrancis/Checkpoint ); précédent : 002B99; suivant : 002C01

Difference imaging photometry of blended gravitational microlensing events with a numerical kernel

Auteurs : M. D. Albrow [Nouvelle-Zélande] ; K. Home [Royaume-Uni] ; D. M. Bramich [Espagne] ; P. Fouque [France] ; V. R. Miller [Nouvelle-Zélande] ; J.-P. Beaulieu [France] ; C. Coutures [France] ; J. Menzies [Afrique du Sud] ; A. Williams [Australie] ; V. Batista [France] ; D. P. Bennett [États-Unis] ; S. Brillant [Chili] ; A. Cassan [Allemagne] ; S. Dieters [France] ; D. Dominis Prester [Croatie] ; J. Donatowicz [Autriche] ; J. Greenhill [Australie] ; N. Kains [Royaume-Uni] ; S. R. Kane [États-Unis] ; D. Kubas [Chili] ; J. B. Marquette [France] ; K. R. Pollard [Nouvelle-Zélande] ; K. C. Sahu [États-Unis] ; Y. Tsapras [États-Unis, Royaume-Uni] ; J. Wambsganss [Allemagne] ; M. Zub [Allemagne]

Source :

RBID : Pascal:09-0360685

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English descriptors

Abstract

The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to ISIS2, is demonstrated.


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Pascal:09-0360685

Le document en format XML

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<name sortKey="Zub, M" sort="Zub, M" uniqKey="Zub M" first="M." last="Zub">M. Zub</name>
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<title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title>
<title level="j" type="abbreviated">Mon. Not. R. Astron. Soc.</title>
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<date when="2009">2009</date>
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<term>Algorithms</term>
<term>Image processing</term>
<term>Microlenses</term>
<term>Performance</term>
<term>Photometry</term>
<term>Planets</term>
<term>Statistical method</term>
<term>Uncertainty</term>
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<term>Photométrie</term>
<term>Microlentille</term>
<term>Planète</term>
<term>Algorithme</term>
<term>Incertitude</term>
<term>Performance</term>
<term>Méthode statistique</term>
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<front>
<div type="abstract" xml:lang="en">The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to ISIS2, is demonstrated.</div>
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<s1>Perth Observatory, Walnut Road</s1>
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<s1>University of Notre Dame, Department of Physics, 225 Nieuwland Science Hall</s1>
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<s1>Astronomisches Rechen-Institut (ARI), Zentrum fur Astronomie (ZAH), Heidelberg University, Monchhofstrasse 12-14</s1>
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<sZ>25 aut.</sZ>
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<s1>Department of Physics, University of Rijeka, Omladinska 14</s1>
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</fA14>
<fA14 i1="13">
<s1>Technical University of Vienna, Department of Computing, Wiedner Hauptstrasse 10</s1>
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<s3>AUT</s3>
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</fA14>
<fA14 i1="14">
<s1>University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart</s1>
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<sZ>17 aut.</sZ>
</fA14>
<fA14 i1="15">
<s1>NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue</s1>
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<s1>Space Telescope Science Institute, 3700 San Martin Drive</s1>
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<s1>Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102</s1>
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<s3>USA</s3>
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<s1>Astrophysics Research Institute, Liverpool John Moores University</s1>
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<s1>2099-2105</s1>
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<s0>ENG</s0>
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<s1>© 2009 INIST-CNRS. All rights reserved.</s1>
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<s0>Monthly Notices of the Royal Astronomical Society</s0>
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<s0>GBR</s0>
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<s0>The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to ISIS2, is demonstrated.</s0>
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