Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
Identifieur interne : 000D58 ( Istex/Curation ); précédent : 000D57; suivant : 000D59Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
Auteurs : D. J. Pinfield [Royaume-Uni] ; B. Burningham ; M. Tamura [Japon] ; S. K. Leggett [États-Unis] ; N. Lodieu [Espagne] ; P. W. Lucas ; D. J. Mortlock ; S. J. Warren ; D. Homeier [Allemagne] ; M. Ishii [États-Unis] ; N. R. Deacon [Pays-Bas] ; R. G. Mcmahon ; P. C. Hewett ; M. R. Zapatero Osori [Espagne] ; E. L. Martin [Espagne] ; H. R. A. Jones ; B. P. Venemans ; A. C. Day-Jones ; P. D. Dobbie [Australie] ; S. L. Folkes ; S. Dye ; F. Allard [France] ; I. Baraffe [France] ; D. Barrado Y Navascués [Espagne] ; S. L. Casewell ; K. Chiu ; G. Chabrier [France] ; F. Clarke [Chili] ; S. T. Hodgkin ; A. Magazzù [Espagne] ; M. J. Mccaughrean ; T. Nakajima [Japon] ; Y. Pavlenko [Ukraine] ; C. G. Tinney [Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-10-11.
Abstract
We present the discovery of 15 new T2.5–T7.5 dwarfs (with estimated distances ∼24–93 pc), identified in the first three main data releases of the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey. This brings the total number of T dwarfs discovered in the Large Area Survey (LAS) (to date) to 28. These discoveries are confirmed by near-infrared spectroscopy, from which we derive spectral types on the unified scheme of Burgasser et al. Seven of the new T dwarfs have spectral types of T2.5–T4.5, five have spectral types of T5–T5.5, one is a T6.5p and two are T7–7.5. We assess spectral morphology and colours to identify T dwarfs in our sample that may have non-typical physical properties (by comparison to solar neighbourhood populations), and find that three of these new T dwarfs may have unusual metallicity, two may have low surface gravity, and one may have high surface gravity. The colours of the full sample of LAS T dwarfs show a possible trend to bluer Y−J with decreasing effective temperature, and some interesting colour changes in J−H and z−J (deserving further investigation) beyond T8. The LAS T dwarf sample from the first and second main data releases show good evidence for a good level of completion to J= 19. By accounting for the main sources of incompleteness (selection, follow-up and spatial) as well as the effects of unresolved binarity, Malmquist and Eddington bias, we estimate that there are 17 ± 4 ≥ T 4 dwarfs in the J≤ 19 volume of the LAS second data release. This value is most consistent with theoretical predictions if the substellar mass function exponent α (dN/dm∝m−α) lies between −1.0 and 0. This is consistent with the latest 2-Micron All Sky Survey (2MASS)/Sloan Digital Sky Survey (SDSS) constraint (which is based on lower number statistics) and is significantly lower than the α∼ 1.0 suggested by L dwarf field populations, which is possibly a result of the lower mass range probed by the T dwarf class.
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DOI: 10.1111/j.1365-2966.2008.13729.x
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D. J. Pinfield<affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: D.J.Pinfield@herts.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation><affiliation><mods:affiliation>Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ</mods:affiliation><wicri:noCountry code="subField">2AZ</wicri:noCountry></affiliation><affiliation><mods:affiliation>Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ</mods:affiliation><wicri:noCountry code="subField">2AZ</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation><affiliation><mods:affiliation>Cardif University, School of Physics & Astronomy, Queens Buildings, The Parade, Cardiff CF24 3AA</mods:affiliation><wicri:noCountry code="subField">3AA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation><affiliation><mods:affiliation>School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL</mods:affiliation><wicri:noCountry code="subField">4QL</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL</mods:affiliation><wicri:noCountry code="subField">4QL</wicri:noCountry></affiliation>Le document en format XML
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Allard</name><affiliation wicri:level="1"><mods:affiliation>Centre de Recherche Astrophysique de Lyon, UMR5574, CNRS, Universite de Lyon, Ecole Normale Superieure, 46 Allee d'Italie, F-69364 Lyon Cedex 07, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre de Recherche Astrophysique de Lyon, UMR5574, CNRS, Universite de Lyon, Ecole Normale Superieure, 46 Allee d'Italie, F-69364 Lyon Cedex 07</wicri:regionArea></affiliation></author><author><name sortKey="Baraffe, I" sort="Baraffe, I" uniqKey="Baraffe I" first="I." last="Baraffe">I. Baraffe</name><affiliation wicri:level="1"><mods:affiliation>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07</wicri:regionArea></affiliation></author><author><name sortKey="Barrado Y Navascues, D" sort="Barrado Y Navascues, D" uniqKey="Barrado Y Navascues D" first="D." last="Barrado Y Navascués">D. Barrado Y Navascués</name><affiliation wicri:level="1"><mods:affiliation>Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, PO Box 50727, E-2808 Madrid, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, PO Box 50727, E-2808 Madrid</wicri:regionArea></affiliation></author><author><name sortKey="Casewell, S L" sort="Casewell, S L" uniqKey="Casewell S" first="S. L." last="Casewell">S. L. Casewell</name><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation></author><author><name sortKey="Chiu, K" sort="Chiu, K" uniqKey="Chiu K" first="K." last="Chiu">K. Chiu</name><affiliation><mods:affiliation>School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL</mods:affiliation><wicri:noCountry code="subField">4QL</wicri:noCountry></affiliation></author><author><name sortKey="Chabrier, G" sort="Chabrier, G" uniqKey="Chabrier G" first="G." last="Chabrier">G. Chabrier</name><affiliation wicri:level="1"><mods:affiliation>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07</wicri:regionArea></affiliation></author><author><name sortKey="Clarke, F" sort="Clarke, F" uniqKey="Clarke F" first="F." last="Clarke">F. Clarke</name><affiliation wicri:level="1"><mods:affiliation>European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile</mods:affiliation><country xml:lang="fr">Chili</country><wicri:regionArea>European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19</wicri:regionArea></affiliation></author><author><name sortKey="Hodgkin, S T" sort="Hodgkin, S T" uniqKey="Hodgkin S" first="S. T." last="Hodgkin">S. T. Hodgkin</name><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Magazzu, A" sort="Magazzu, A" uniqKey="Magazzu A" first="A." last="Magazzù">A. Magazzù</name><affiliation wicri:level="1"><mods:affiliation>Fundación Galileo Galilei-INAF, Apartado 565, E-38700 Santa Cruz de La Palma, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Fundación Galileo Galilei-INAF, Apartado 565, E-38700 Santa Cruz de La Palma</wicri:regionArea></affiliation></author><author><name sortKey="Mccaughrean, M J" sort="Mccaughrean, M J" uniqKey="Mccaughrean M" first="M. J." last="Mccaughrean">M. J. Mccaughrean</name><affiliation><mods:affiliation>School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL</mods:affiliation><wicri:noCountry code="subField">4QL</wicri:noCountry></affiliation></author><author><name sortKey="Nakajima, T" sort="Nakajima, T" uniqKey="Nakajima T" first="T." last="Nakajima">T. Nakajima</name><affiliation wicri:level="1"><mods:affiliation>National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>National Astronomical Observatory, Mitaka, Tokyo 181-8588</wicri:regionArea></affiliation></author><author><name sortKey="Pavlenko, Y" sort="Pavlenko, Y" uniqKey="Pavlenko Y" first="Y." last="Pavlenko">Y. Pavlenko</name><affiliation wicri:level="1"><mods:affiliation>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho 27, Kyiv-127 03680, Ukraine</mods:affiliation><country xml:lang="fr">Ukraine</country><wicri:regionArea>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho 27, Kyiv-127 03680</wicri:regionArea></affiliation></author><author><name sortKey="Tinney, C G" sort="Tinney, C G" uniqKey="Tinney C" first="C. G." last="Tinney">C. G. Tinney</name><affiliation wicri:level="1"><mods:affiliation>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:486B8773293118A6D1EC9DCCE7E16884CAAF569C</idno><date when="2008" year="2008">2008</date><idno type="doi">10.1111/j.1365-2966.2008.13729.x</idno><idno type="url">https://api.istex.fr/document/486B8773293118A6D1EC9DCCE7E16884CAAF569C/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000D58</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000D58</idno><idno type="wicri:Area/Istex/Curation">000D58</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey</title><author><name sortKey="Pinfield, D J" sort="Pinfield, D J" uniqKey="Pinfield D" first="D. J." last="Pinfield">D. J. Pinfield</name><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: D.J.Pinfield@herts.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation><affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: D.J.Pinfield@herts.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation></author><author><name sortKey="Burningham, B" sort="Burningham, B" uniqKey="Burningham B" first="B." last="Burningham">B. Burningham</name><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Tamura, M" sort="Tamura, M" uniqKey="Tamura M" first="M." last="Tamura">M. Tamura</name><affiliation wicri:level="1"><mods:affiliation>National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>National Astronomical Observatory, Mitaka, Tokyo 181-8588</wicri:regionArea></affiliation></author><author><name sortKey="Leggett, S K" sort="Leggett, S K" uniqKey="Leggett S" first="S. K." last="Leggett">S. K. Leggett</name><affiliation wicri:level="1"><mods:affiliation>Gemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Gemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720</wicri:regionArea></affiliation></author><author><name sortKey="Lodieu, N" sort="Lodieu, N" uniqKey="Lodieu N" first="N." last="Lodieu">N. Lodieu</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Instituto de Astrofísica de Canarias, 38200 La Laguna</wicri:regionArea></affiliation></author><author><name sortKey="Lucas, P W" sort="Lucas, P W" uniqKey="Lucas P" first="P. W." last="Lucas">P. W. Lucas</name><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Mortlock, D J" sort="Mortlock, D J" uniqKey="Mortlock D" first="D. J." last="Mortlock">D. J. Mortlock</name><affiliation><mods:affiliation>Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ</mods:affiliation><wicri:noCountry code="subField">2AZ</wicri:noCountry></affiliation></author><author><name sortKey="Warren, S J" sort="Warren, S J" uniqKey="Warren S" first="S. J." last="Warren">S. J. Warren</name><affiliation><mods:affiliation>Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ</mods:affiliation><wicri:noCountry code="subField">2AZ</wicri:noCountry></affiliation></author><author><name sortKey="Homeier, D" sort="Homeier, D" uniqKey="Homeier D" first="D." last="Homeier">D. Homeier</name><affiliation wicri:level="1"><mods:affiliation>Institut fur Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1, 37077 Gottingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut fur Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1, 37077 Gottingen</wicri:regionArea></affiliation></author><author><name sortKey="Ishii, M" sort="Ishii, M" uniqKey="Ishii M" first="M." last="Ishii">M. Ishii</name><affiliation wicri:level="1"><mods:affiliation>Subaru Telescope, 650 North A'ohoku Place, Hilo, HI 96720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Subaru Telescope, 650 North A'ohoku Place, Hilo, HI 96720</wicri:regionArea></affiliation></author><author><name sortKey="Deacon, N R" sort="Deacon, N R" uniqKey="Deacon N" first="N. R." last="Deacon">N. R. Deacon</name><affiliation wicri:level="1"><mods:affiliation>Department of Astrophysics, Faculty of Science, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands</mods:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Department of Astrophysics, Faculty of Science, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen</wicri:regionArea></affiliation></author><author><name sortKey="Mcmahon, R G" sort="Mcmahon, R G" uniqKey="Mcmahon R" first="R. G." last="Mcmahon">R. G. Mcmahon</name><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Hewett, P C" sort="Hewett, P C" uniqKey="Hewett P" first="P. C." last="Hewett">P. C. Hewett</name><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Osori, M R Zapatero" sort="Osori, M R Zapatero" uniqKey="Osori M" first="M. R. Zapatero" last="Osori">M. R. Zapatero Osori</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Instituto de Astrofísica de Canarias, 38200 La Laguna</wicri:regionArea></affiliation></author><author><name sortKey="Martin, E L" sort="Martin, E L" uniqKey="Martin E" first="E. L." last="Martin">E. L. Martin</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Instituto de Astrofísica de Canarias, 38200 La Laguna</wicri:regionArea></affiliation></author><author><name sortKey="Jones, H R A" sort="Jones, H R A" uniqKey="Jones H" first="H. R. A." last="Jones">H. R. A. Jones</name><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Venemans, B P" sort="Venemans, B P" uniqKey="Venemans B" first="B. P." last="Venemans">B. P. Venemans</name><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Day Jones, A C" sort="Day Jones, A C" uniqKey="Day Jones A" first="A. C." last="Day-Jones">A. C. Day-Jones</name><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Dobbie, P D" sort="Dobbie, P D" uniqKey="Dobbie P" first="P. D." last="Dobbie">P. D. Dobbie</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, PO Box 296, Epping 1710, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, PO Box 296, Epping 1710</wicri:regionArea></affiliation></author><author><name sortKey="Folkes, S L" sort="Folkes, S L" uniqKey="Folkes S" first="S. L." last="Folkes">S. L. Folkes</name><affiliation><mods:affiliation>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Dye, S" sort="Dye, S" uniqKey="Dye S" first="S." last="Dye">S. Dye</name><affiliation><mods:affiliation>Cardif University, School of Physics & Astronomy, Queens Buildings, The Parade, Cardiff CF24 3AA</mods:affiliation><wicri:noCountry code="subField">3AA</wicri:noCountry></affiliation></author><author><name sortKey="Allard, F" sort="Allard, F" uniqKey="Allard F" first="F." last="Allard">F. Allard</name><affiliation wicri:level="1"><mods:affiliation>Centre de Recherche Astrophysique de Lyon, UMR5574, CNRS, Universite de Lyon, Ecole Normale Superieure, 46 Allee d'Italie, F-69364 Lyon Cedex 07, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre de Recherche Astrophysique de Lyon, UMR5574, CNRS, Universite de Lyon, Ecole Normale Superieure, 46 Allee d'Italie, F-69364 Lyon Cedex 07</wicri:regionArea></affiliation></author><author><name sortKey="Baraffe, I" sort="Baraffe, I" uniqKey="Baraffe I" first="I." last="Baraffe">I. Baraffe</name><affiliation wicri:level="1"><mods:affiliation>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07</wicri:regionArea></affiliation></author><author><name sortKey="Barrado Y Navascues, D" sort="Barrado Y Navascues, D" uniqKey="Barrado Y Navascues D" first="D." last="Barrado Y Navascués">D. Barrado Y Navascués</name><affiliation wicri:level="1"><mods:affiliation>Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, PO Box 50727, E-2808 Madrid, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, PO Box 50727, E-2808 Madrid</wicri:regionArea></affiliation></author><author><name sortKey="Casewell, S L" sort="Casewell, S L" uniqKey="Casewell S" first="S. L." last="Casewell">S. L. Casewell</name><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation></author><author><name sortKey="Chiu, K" sort="Chiu, K" uniqKey="Chiu K" first="K." last="Chiu">K. Chiu</name><affiliation><mods:affiliation>School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL</mods:affiliation><wicri:noCountry code="subField">4QL</wicri:noCountry></affiliation></author><author><name sortKey="Chabrier, G" sort="Chabrier, G" uniqKey="Chabrier G" first="G." last="Chabrier">G. Chabrier</name><affiliation wicri:level="1"><mods:affiliation>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>C.R.A.L. (UMR 5574 CNRS), Ecole Normale Superieure, F-69364 Lyon Cedex 07</wicri:regionArea></affiliation></author><author><name sortKey="Clarke, F" sort="Clarke, F" uniqKey="Clarke F" first="F." last="Clarke">F. Clarke</name><affiliation wicri:level="1"><mods:affiliation>European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile</mods:affiliation><country xml:lang="fr">Chili</country><wicri:regionArea>European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19</wicri:regionArea></affiliation></author><author><name sortKey="Hodgkin, S T" sort="Hodgkin, S T" uniqKey="Hodgkin S" first="S. T." last="Hodgkin">S. T. Hodgkin</name><affiliation><mods:affiliation>Institute of Astronomy, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Magazzu, A" sort="Magazzu, A" uniqKey="Magazzu A" first="A." last="Magazzù">A. Magazzù</name><affiliation wicri:level="1"><mods:affiliation>Fundación Galileo Galilei-INAF, Apartado 565, E-38700 Santa Cruz de La Palma, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Fundación Galileo Galilei-INAF, Apartado 565, E-38700 Santa Cruz de La Palma</wicri:regionArea></affiliation></author><author><name sortKey="Mccaughrean, M J" sort="Mccaughrean, M J" uniqKey="Mccaughrean M" first="M. J." last="Mccaughrean">M. J. Mccaughrean</name><affiliation><mods:affiliation>School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL</mods:affiliation><wicri:noCountry code="subField">4QL</wicri:noCountry></affiliation></author><author><name sortKey="Nakajima, T" sort="Nakajima, T" uniqKey="Nakajima T" first="T." last="Nakajima">T. Nakajima</name><affiliation wicri:level="1"><mods:affiliation>National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>National Astronomical Observatory, Mitaka, Tokyo 181-8588</wicri:regionArea></affiliation></author><author><name sortKey="Pavlenko, Y" sort="Pavlenko, Y" uniqKey="Pavlenko Y" first="Y." last="Pavlenko">Y. Pavlenko</name><affiliation wicri:level="1"><mods:affiliation>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho 27, Kyiv-127 03680, Ukraine</mods:affiliation><country xml:lang="fr">Ukraine</country><wicri:regionArea>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho 27, Kyiv-127 03680</wicri:regionArea></affiliation></author><author><name sortKey="Tinney, C G" sort="Tinney, C G" uniqKey="Tinney C" first="C. G." last="Tinney">C. G. Tinney</name><affiliation wicri:level="1"><mods:affiliation>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2008-10-11">2008-10-11</date><biblScope unit="volume">390</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="304">304</biblScope><biblScope unit="page" to="322">322</biblScope></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">We present the discovery of 15 new T2.5–T7.5 dwarfs (with estimated distances ∼24–93 pc), identified in the first three main data releases of the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey. This brings the total number of T dwarfs discovered in the Large Area Survey (LAS) (to date) to 28. These discoveries are confirmed by near-infrared spectroscopy, from which we derive spectral types on the unified scheme of Burgasser et al. Seven of the new T dwarfs have spectral types of T2.5–T4.5, five have spectral types of T5–T5.5, one is a T6.5p and two are T7–7.5. We assess spectral morphology and colours to identify T dwarfs in our sample that may have non-typical physical properties (by comparison to solar neighbourhood populations), and find that three of these new T dwarfs may have unusual metallicity, two may have low surface gravity, and one may have high surface gravity. The colours of the full sample of LAS T dwarfs show a possible trend to bluer Y−J with decreasing effective temperature, and some interesting colour changes in J−H and z−J (deserving further investigation) beyond T8. The LAS T dwarf sample from the first and second main data releases show good evidence for a good level of completion to J= 19. By accounting for the main sources of incompleteness (selection, follow-up and spatial) as well as the effects of unresolved binarity, Malmquist and Eddington bias, we estimate that there are 17 ± 4 ≥ T 4 dwarfs in the J≤ 19 volume of the LAS second data release. This value is most consistent with theoretical predictions if the substellar mass function exponent α (dN/dm∝m−α) lies between −1.0 and 0. This is consistent with the latest 2-Micron All Sky Survey (2MASS)/Sloan Digital Sky Survey (SDSS) constraint (which is based on lower number statistics) and is significantly lower than the α∼ 1.0 suggested by L dwarf field populations, which is possibly a result of the lower mass range probed by the T dwarf class.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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