Two T dwarfs from the UKIDSS early data release
Identifieur interne : 009267 ( Main/Exploration ); précédent : 009266; suivant : 009268Two T dwarfs from the UKIDSS early data release
Auteurs : T. R. Kendall [Royaume-Uni] ; M. Tamura [Japon] ; C. G. Tinney [Australie] ; E. L. Martfn [Espagne, États-Unis] ; M. Ishii [États-Unis] ; D. J. Pinfield [Royaume-Uni] ; P. W. Lucas [Royaume-Uni] ; H. R. A. Jones [Royaume-Uni] ; S. K. Leggett [États-Unis] ; S. Dye [Royaume-Uni] ; P. C. Hewett [Royaume-Uni] ; F. Allard [France] ; I. Baraffe [France] ; D. Barrado Y Navascues [Espagne] ; G. Carraro [Italie] ; S. L. Casewell [Royaume-Uni] ; G. Chabrier [France] ; R. J. Chappelle [République tchèque] ; F. Clarke [Chili] ; A. Day-Jones [Royaume-Uni] ; N. Deacon [Royaume-Uni, Pays-Bas] ; P. D. Dobbie [Royaume-Uni] ; S. Folkes [Royaume-Uni] ; N. C. Hambly [Royaume-Uni] ; S. T. Hodgkin [Royaume-Uni] ; T. Nakajima [Japon] ; R. F. Jameson [Royaume-Uni] ; N. Lodieu [Royaume-Uni] ; A. Magazzu [Espagne] ; M. J. Mccaughrean [Royaume-Uni] ; Y. V. Pavlenko [Ukraine] ; N. Tadashi [Japon] ; M. R. Zapatero Osorio [Espagne]Source :
- Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2007.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Spectrométrie.
English descriptors
- KwdEn :
Abstract
Context. We report on the first ultracool dwarf discoveries from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey Early Data Release (LAS EDR), in particular the discovery of T dwarfs which are fainter and more distant than those found using the 2MASS and SDSS surveys. Aims. We aim to show that our methodologies for searching the ∼27 deg2 of the LAS EDR are successful for finding both L and T dwarfs via cross-correlation with the Sloan Digital Sky Survey (SDSS) DR4 release. While the area searched so far is small, the numbers of objects found shows great promise for near-future releases of the LAS and great potential for finding large numbers of such dwarfs. Methods. Ultracool dwarfs are selected by combinations of their YJH(K) UKIDSS colours and SDSS DR4 z - J and i - z colours, or, lower limits on these red optical/infrared colours in the case of DR4 dropouts. After passing visual inspection tests, candidates have been followed up by methane imaging and spectroscopy at 4 m and 8 m-class facilities. Results. Our main result is the discovery following CH4 imaging and spectroscopy of a T4.5 dwarf, ULAS 1452+0655, lying ∼80 pc distant. A further T dwarf candidate, ULAS J 1301+0023, has very similar CH4 colours but has not yet been confirmed spectroscopically. We also report on the identification of a brighter L0 dwarf, and on the selection of a list of LAS objects designed to probe for T-like dwarfs to the survey J-band limit. Conclusions. Our findings indicate that the combination of the UKIDSS LAS and SDSS surveys provide an excellent tool for identifying L and T dwarfs down to much fainter limits than previously possible. Our discovery of one confirmed and one probable T dwarf in the EDR is consistent with expectations from the previously measured T dwarf density on the sky.
Affiliations:
- Australie, Chili, Espagne, France, Italie, Japon, Pays-Bas, Royaume-Uni, République tchèque, Ukraine, États-Unis
- Auvergne-Rhône-Alpes, Canaries, Communauté de Madrid, Rhône-Alpes, Région de Kantō, Vénétie
- Lyon, Padoue, Tokyo
- Université de Padoue
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Carraro</name><affiliation wicri:level="4"><inist:fA14 i1="12"><s1>Dipartmento di Astronomia, Universitá di Padova, Vicolo Osservatorio 5</s1><s2>35122 Padova</s2><s3>ITA</s3><sZ>15 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>35122 Padova</wicri:noRegion><orgName type="university">Université de Padoue</orgName><placeName><settlement type="city">Padoue</settlement><region type="region" nuts="2">Vénétie</region></placeName></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 wicri:level="1"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Chabrier, G" sort="Chabrier, G" uniqKey="Chabrier G" first="G." last="Chabrier">G. Chabrier</name><affiliation wicri:level="3"><inist:fA14 i1="10"><s1>C.R.A.L. (UMR 5574 CNRS), École Normale Supérieure</s1><s2>69364 Lyon</s2><s3>FRA</s3><sZ>12 aut.</sZ><sZ>13 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Lyon</settlement></placeName></affiliation></author><author><name sortKey="Chappelle, R J" sort="Chappelle, R J" uniqKey="Chappelle R" first="R. J." last="Chappelle">R. J. 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Day-Jones</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></affiliation></author><author><name sortKey="Deacon, N" sort="Deacon, N" uniqKey="Deacon N" first="N." last="Deacon">N. Deacon</name><affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Scottish Universities Physics Alliance, Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Blackford Hill</s1><s2>Edinburgh, EH9 3HJ</s2><s3>GBR</s3><sZ>21 aut.</sZ><sZ>24 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Edinburgh, EH9 3HJ</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Department of Astrophysics, Faculty of Science, Radboud University Nijmegen, PO Box 9010</s1><s2>6500 GL Nijmegen</s2><s3>NLD</s3><sZ>21 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>6500 GL Nijmegen</wicri:noRegion></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"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Folkes, S" sort="Folkes, S" uniqKey="Folkes S" first="S." last="Folkes">S. Folkes</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></affiliation></author><author><name sortKey="Hambly, N C" sort="Hambly, N C" uniqKey="Hambly N" first="N. C." last="Hambly">N. C. Hambly</name><affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Scottish Universities Physics Alliance, Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Blackford Hill</s1><s2>Edinburgh, EH9 3HJ</s2><s3>GBR</s3><sZ>21 aut.</sZ><sZ>24 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Edinburgh, EH9 3HJ</wicri:noRegion></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 wicri:level="1"><inist:fA14 i1="09"><s1>Inst. of Astronomy, Madingley Rd</s1><s2>Cambridge CB3 0HA</s2><s3>GBR</s3><sZ>11 aut.</sZ><sZ>25 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion></affiliation></author><author><name sortKey="Nakajima, T" sort="Nakajima, T" uniqKey="Nakajima T" first="T." last="Nakajima">T. Nakajima</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Astronomical Observatory of Japan, 2-21-1 Osawa</s1><s2>Mitaka, Tokyo 181-8588</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>26 aut.</sZ><sZ>32 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></affiliation></author><author><name sortKey="Jameson, R F" sort="Jameson, R F" uniqKey="Jameson R" first="R. F." last="Jameson">R. F. Jameson</name><affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Lodieu, N" sort="Lodieu, N" uniqKey="Lodieu N" first="N." last="Lodieu">N. Lodieu</name><affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Magazzu, A" sort="Magazzu, A" uniqKey="Magazzu A" first="A." last="Magazzu">A. Magazzu</name><affiliation wicri:level="2"><inist:fA14 i1="18"><s1>Fundación Galileo Galilei-INAF, Apartado 565</s1><s2>38700 Santa Cruz de La Palma</s2><s3>ESP</s3><sZ>29 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Canaries</region></placeName></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 wicri:level="1"><inist:fA14 i1="19"><s1>University of Exeter, School of Physics, Stocker Road</s1><s2>Exeter, EX4 4QL</s2><s3>GBR</s3><sZ>30 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Exeter, EX4 4QL</wicri:noRegion></affiliation></author><author><name sortKey="Pavlenko, Y V" sort="Pavlenko, Y V" uniqKey="Pavlenko Y" first="Y. V." last="Pavlenko">Y. V. Pavlenko</name><affiliation wicri:level="1"><inist:fA14 i1="20"><s1>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho</s1><s2>Kyiv, 03680</s2><s3>UKR</s3><sZ>31 aut.</sZ></inist:fA14><country>Ukraine</country><wicri:noRegion>Kyiv, 03680</wicri:noRegion></affiliation></author><author><name sortKey="Tadashi, N" sort="Tadashi, N" uniqKey="Tadashi N" first="N." last="Tadashi">N. Tadashi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Astronomical Observatory of Japan, 2-21-1 Osawa</s1><s2>Mitaka, Tokyo 181-8588</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>26 aut.</sZ><sZ>32 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></affiliation></author><author><name sortKey="Zapatero Osorio, M R" sort="Zapatero Osorio, M R" uniqKey="Zapatero Osorio M" first="M. R." last="Zapatero Osorio">M. R. Zapatero Osorio</name><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Instituto de Astrofisica de Canarias</s1><s2>38200 La Laguna</s2><s3>ESP</s3><sZ>4 aut.</sZ><sZ>33 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Canaries</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0224244</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0224244 INIST</idno><idno type="RBID">Pascal:07-0224244</idno><idno type="wicri:Area/PascalFrancis/Corpus">003C59</idno><idno type="wicri:Area/PascalFrancis/Curation">002429</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">003531</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">003531</idno><idno type="wicri:doubleKey">0004-6361:2007:Kendall T:two:t:dwarfs</idno><idno type="wicri:Area/Main/Merge">009C43</idno><idno type="wicri:Area/Main/Curation">009267</idno><idno type="wicri:Area/Main/Exploration">009267</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Two T dwarfs from the UKIDSS early data release</title><author><name sortKey="Kendall, T R" sort="Kendall, T R" uniqKey="Kendall T" first="T. R." last="Kendall">T. R. Kendall</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></affiliation></author><author><name sortKey="Tamura, M" sort="Tamura, M" uniqKey="Tamura M" first="M." last="Tamura">M. Tamura</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Astronomical Observatory of Japan, 2-21-1 Osawa</s1><s2>Mitaka, Tokyo 181-8588</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>26 aut.</sZ><sZ>32 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></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"><inist:fA14 i1="03"><s1>Anglo-Australian Observatory, PO Box 296</s1><s2>Epping 1710</s2><s3>AUS</s3><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Epping 1710</wicri:noRegion></affiliation></author><author><name sortKey="Martfn, E L" sort="Martfn, E L" uniqKey="Martfn E" first="E. L." last="Martfn">E. L. Martfn</name><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Instituto de Astrofisica de Canarias</s1><s2>38200 La Laguna</s2><s3>ESP</s3><sZ>4 aut.</sZ><sZ>33 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Canaries</region></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>University of Central Florida, Physics Dept., PO Box 162385</s1><s2>Orlando, FL 32816-2385</s2><s3>USA</s3><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Orlando, FL 32816-2385</wicri:noRegion></affiliation></author><author><name sortKey="Ishii, M" sort="Ishii, M" uniqKey="Ishii M" first="M." last="Ishii">M. Ishii</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Subaru Telescope, 650 North A'ohoku Place</s1><s2>Hilo, Hi 96720</s2><s3>USA</s3><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Hilo, Hi 96720</wicri:noRegion></affiliation></author><author><name sortKey="Pinfield, D J" sort="Pinfield, D J" uniqKey="Pinfield D" first="D. J." last="Pinfield">D. J. Pinfield</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></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 wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></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 wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></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"><inist:fA14 i1="07"><s1>Gemini Observatory, 670 North A'oholu Place</s1><s2>Hilo, Hawai'i 96720</s2><s3>USA</s3><sZ>9 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Hilo, Hawai'i 96720</wicri:noRegion></affiliation></author><author><name sortKey="Dye, S" sort="Dye, S" uniqKey="Dye S" first="S." last="Dye">S. Dye</name><affiliation wicri:level="1"><inist:fA14 i1="08"><s1>School of Physics & Astronomy, Cardiff University, 5, The Parade</s1><s2>Cardiff, CF24 3AA, Wales</s2><s3>GBR</s3><sZ>10 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cardiff, CF24 3AA, Wales</wicri:noRegion></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 wicri:level="1"><inist:fA14 i1="09"><s1>Inst. of Astronomy, Madingley Rd</s1><s2>Cambridge CB3 0HA</s2><s3>GBR</s3><sZ>11 aut.</sZ><sZ>25 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion></affiliation></author><author><name sortKey="Allard, F" sort="Allard, F" uniqKey="Allard F" first="F." last="Allard">F. Allard</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>C.R.A.L. (UMR 5574 CNRS), École Normale Supérieure</s1><s2>69364 Lyon</s2><s3>FRA</s3><sZ>12 aut.</sZ><sZ>13 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>69364 Lyon</wicri:noRegion><placeName><settlement type="city">Lyon</settlement><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region></placeName></affiliation></author><author><name sortKey="Baraffe, I" sort="Baraffe, I" uniqKey="Baraffe I" first="I." last="Baraffe">I. Baraffe</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>C.R.A.L. (UMR 5574 CNRS), École Normale Supérieure</s1><s2>69364 Lyon</s2><s3>FRA</s3><sZ>12 aut.</sZ><sZ>13 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>69364 Lyon</wicri:noRegion><placeName><settlement type="city">Lyon</settlement><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region></placeName></affiliation></author><author><name sortKey="Barrado Y Navascues, D" sort="Barrado Y Navascues, D" uniqKey="Barrado Y Navascues D" first="D." last="Barrado Y Navascues">D. Barrado Y Navascues</name><affiliation wicri:level="2"><inist:fA14 i1="11"><s1>Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, PO Box 50727</s1><s2>28080 Madrid</s2><s3>ESP</s3><sZ>14 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></affiliation></author><author><name sortKey="Carraro, G" sort="Carraro, G" uniqKey="Carraro G" first="G." last="Carraro">G. Carraro</name><affiliation wicri:level="4"><inist:fA14 i1="12"><s1>Dipartmento di Astronomia, Universitá di Padova, Vicolo Osservatorio 5</s1><s2>35122 Padova</s2><s3>ITA</s3><sZ>15 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>35122 Padova</wicri:noRegion><orgName type="university">Université de Padoue</orgName><placeName><settlement type="city">Padoue</settlement><region type="region" nuts="2">Vénétie</region></placeName></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 wicri:level="1"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Chabrier, G" sort="Chabrier, G" uniqKey="Chabrier G" first="G." last="Chabrier">G. Chabrier</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>C.R.A.L. (UMR 5574 CNRS), École Normale Supérieure</s1><s2>69364 Lyon</s2><s3>FRA</s3><sZ>12 aut.</sZ><sZ>13 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>69364 Lyon</wicri:noRegion><placeName><settlement type="city">Lyon</settlement><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region></placeName></affiliation></author><author><name sortKey="Chappelle, R J" sort="Chappelle, R J" uniqKey="Chappelle R" first="R. J." last="Chappelle">R. J. Chappelle</name><affiliation wicri:level="1"><inist:fA14 i1="14"><s1>Astronomical Institute, Academy of Sciences of the Czech Republic, Bocni II/1401a</s1><s2>141 31 Prague</s2><s3>CZE</s3><sZ>18 aut.</sZ></inist:fA14><country>République tchèque</country><wicri:noRegion>141 31 Prague</wicri:noRegion></affiliation></author><author><name sortKey="Clarke, F" sort="Clarke, F" uniqKey="Clarke F" first="F." last="Clarke">F. Clarke</name><affiliation wicri:level="1"><inist:fA14 i1="15"><s1>European Southern Observatory, Alonso de Cordova 3107, Casilla 19001</s1><s2>Santiago</s2><s3>CHL</s3><sZ>19 aut.</sZ></inist:fA14><country>Chili</country><wicri:noRegion>Santiago</wicri:noRegion></affiliation></author><author><name sortKey="Day Jones, A" sort="Day Jones, A" uniqKey="Day Jones A" first="A." last="Day-Jones">A. Day-Jones</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></affiliation></author><author><name sortKey="Deacon, N" sort="Deacon, N" uniqKey="Deacon N" first="N." last="Deacon">N. Deacon</name><affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Scottish Universities Physics Alliance, Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Blackford Hill</s1><s2>Edinburgh, EH9 3HJ</s2><s3>GBR</s3><sZ>21 aut.</sZ><sZ>24 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Edinburgh, EH9 3HJ</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Department of Astrophysics, Faculty of Science, Radboud University Nijmegen, PO Box 9010</s1><s2>6500 GL Nijmegen</s2><s3>NLD</s3><sZ>21 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>6500 GL Nijmegen</wicri:noRegion></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"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Folkes, S" sort="Folkes, S" uniqKey="Folkes S" first="S." last="Folkes">S. Folkes</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, College Lane</s1><s2>Hatfield AL109AB</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ><sZ>8 aut.</sZ><sZ>20 aut.</sZ><sZ>23 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Hatfield AL109AB</wicri:noRegion></affiliation></author><author><name sortKey="Hambly, N C" sort="Hambly, N C" uniqKey="Hambly N" first="N. C." last="Hambly">N. C. Hambly</name><affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Scottish Universities Physics Alliance, Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Blackford Hill</s1><s2>Edinburgh, EH9 3HJ</s2><s3>GBR</s3><sZ>21 aut.</sZ><sZ>24 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Edinburgh, EH9 3HJ</wicri:noRegion></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 wicri:level="1"><inist:fA14 i1="09"><s1>Inst. of Astronomy, Madingley Rd</s1><s2>Cambridge CB3 0HA</s2><s3>GBR</s3><sZ>11 aut.</sZ><sZ>25 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion></affiliation></author><author><name sortKey="Nakajima, T" sort="Nakajima, T" uniqKey="Nakajima T" first="T." last="Nakajima">T. Nakajima</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Astronomical Observatory of Japan, 2-21-1 Osawa</s1><s2>Mitaka, Tokyo 181-8588</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>26 aut.</sZ><sZ>32 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></affiliation></author><author><name sortKey="Jameson, R F" sort="Jameson, R F" uniqKey="Jameson R" first="R. F." last="Jameson">R. F. Jameson</name><affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Lodieu, N" sort="Lodieu, N" uniqKey="Lodieu N" first="N." last="Lodieu">N. Lodieu</name><affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Dept. of Physics & Astronomy, University of Leicester</s1><s2>LEI 7RH</s2><s3>GBR</s3><sZ>16 aut.</sZ><sZ>22 aut.</sZ><sZ>27 aut.</sZ><sZ>28 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>LEI 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Magazzu, A" sort="Magazzu, A" uniqKey="Magazzu A" first="A." last="Magazzu">A. Magazzu</name><affiliation wicri:level="2"><inist:fA14 i1="18"><s1>Fundación Galileo Galilei-INAF, Apartado 565</s1><s2>38700 Santa Cruz de La Palma</s2><s3>ESP</s3><sZ>29 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Canaries</region></placeName></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 wicri:level="1"><inist:fA14 i1="19"><s1>University of Exeter, School of Physics, Stocker Road</s1><s2>Exeter, EX4 4QL</s2><s3>GBR</s3><sZ>30 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Exeter, EX4 4QL</wicri:noRegion></affiliation></author><author><name sortKey="Pavlenko, Y V" sort="Pavlenko, Y V" uniqKey="Pavlenko Y" first="Y. V." last="Pavlenko">Y. V. Pavlenko</name><affiliation wicri:level="1"><inist:fA14 i1="20"><s1>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho</s1><s2>Kyiv, 03680</s2><s3>UKR</s3><sZ>31 aut.</sZ></inist:fA14><country>Ukraine</country><wicri:noRegion>Kyiv, 03680</wicri:noRegion></affiliation></author><author><name sortKey="Tadashi, N" sort="Tadashi, N" uniqKey="Tadashi N" first="N." last="Tadashi">N. Tadashi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>National Astronomical Observatory of Japan, 2-21-1 Osawa</s1><s2>Mitaka, Tokyo 181-8588</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>26 aut.</sZ><sZ>32 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></affiliation></author><author><name sortKey="Zapatero Osorio, M R" sort="Zapatero Osorio, M R" uniqKey="Zapatero Osorio M" first="M. R." last="Zapatero Osorio">M. R. Zapatero Osorio</name><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Instituto de Astrofisica de Canarias</s1><s2>38200 La Laguna</s2><s3>ESP</s3><sZ>4 aut.</sZ><sZ>33 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Canaries</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Brown dwarf stars</term><term>Color</term><term>Cross correlations</term><term>Infrared star</term><term>Infrared surveys</term><term>Low-mass stars</term><term>Lower bound</term><term>Methane</term><term>Sky surveys</term><term>Spectroscopy</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude IR</term><term>Etude ciel</term><term>Corrélation croisée</term><term>Couleur</term><term>Borne inférieure</term><term>Méthane</term><term>Spectrométrie</term><term>Etoile IR</term><term>Etoile faible masse</term><term>Naine brune</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Spectrométrie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Context. We report on the first ultracool dwarf discoveries from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey Early Data Release (LAS EDR), in particular the discovery of T dwarfs which are fainter and more distant than those found using the 2MASS and SDSS surveys. Aims. We aim to show that our methodologies for searching the ∼27 deg2 of the LAS EDR are successful for finding both L and T dwarfs via cross-correlation with the Sloan Digital Sky Survey (SDSS) DR4 release. While the area searched so far is small, the numbers of objects found shows great promise for near-future releases of the LAS and great potential for finding large numbers of such dwarfs. Methods. Ultracool dwarfs are selected by combinations of their YJH(K) UKIDSS colours and SDSS DR4 <sub>z</sub> - J and i - z colours, or, lower limits on these red optical/infrared colours in the case of DR4 dropouts. After passing visual inspection tests, candidates have been followed up by methane imaging and spectroscopy at 4 m and 8 m-class facilities. Results. Our main result is the discovery following CH<sub>4</sub> imaging and spectroscopy of a T4.5 dwarf, ULAS 1452+0655, lying ∼80 pc distant. A further T dwarf candidate, ULAS J 1301+0023, has very similar CH<sub>4</sub> colours but has not yet been confirmed spectroscopically. We also report on the identification of a brighter L0 dwarf, and on the selection of a list of LAS objects designed to probe for T-like dwarfs to the survey J-band limit. Conclusions. Our findings indicate that the combination of the UKIDSS LAS and SDSS surveys provide an excellent tool for identifying L and T dwarfs down to much fainter limits than previously possible. Our discovery of one confirmed and one probable T dwarf in the EDR is consistent with expectations from the previously measured T dwarf density on the sky.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Chili</li><li>Espagne</li><li>France</li><li>Italie</li><li>Japon</li><li>Pays-Bas</li><li>Royaume-Uni</li><li>République tchèque</li><li>Ukraine</li><li>États-Unis</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Canaries</li><li>Communauté de Madrid</li><li>Rhône-Alpes</li><li>Région de Kantō</li><li>Vénétie</li></region><settlement><li>Lyon</li><li>Padoue</li><li>Tokyo</li></settlement><orgName><li>Université de Padoue</li></orgName></list><tree><country name="Royaume-Uni"><noRegion><name sortKey="Kendall, T R" sort="Kendall, T R" uniqKey="Kendall T" first="T. R." last="Kendall">T. R. Kendall</name></noRegion><name sortKey="Casewell, S L" sort="Casewell, S L" uniqKey="Casewell S" first="S. L." last="Casewell">S. L. Casewell</name><name sortKey="Day Jones, A" sort="Day Jones, A" uniqKey="Day Jones A" first="A." last="Day-Jones">A. Day-Jones</name><name sortKey="Deacon, N" sort="Deacon, N" uniqKey="Deacon N" first="N." last="Deacon">N. Deacon</name><name sortKey="Dobbie, P D" sort="Dobbie, P D" uniqKey="Dobbie P" first="P. D." last="Dobbie">P. D. Dobbie</name><name sortKey="Dye, S" sort="Dye, S" uniqKey="Dye S" first="S." last="Dye">S. Dye</name><name sortKey="Folkes, S" sort="Folkes, S" uniqKey="Folkes S" first="S." last="Folkes">S. Folkes</name><name sortKey="Hambly, N C" sort="Hambly, N C" uniqKey="Hambly N" first="N. C." last="Hambly">N. C. Hambly</name><name sortKey="Hewett, P C" sort="Hewett, P C" uniqKey="Hewett P" first="P. C." last="Hewett">P. C. Hewett</name><name sortKey="Hodgkin, S T" sort="Hodgkin, S T" uniqKey="Hodgkin S" first="S. T." last="Hodgkin">S. T. Hodgkin</name><name sortKey="Jameson, R F" sort="Jameson, R F" uniqKey="Jameson R" first="R. F." last="Jameson">R. F. Jameson</name><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><name sortKey="Lodieu, N" sort="Lodieu, N" uniqKey="Lodieu N" first="N." last="Lodieu">N. Lodieu</name><name sortKey="Lucas, P W" sort="Lucas, P W" uniqKey="Lucas P" first="P. W." last="Lucas">P. W. Lucas</name><name sortKey="Mccaughrean, M J" sort="Mccaughrean, M J" uniqKey="Mccaughrean M" first="M. J." last="Mccaughrean">M. J. Mccaughrean</name><name sortKey="Pinfield, D J" sort="Pinfield, D J" uniqKey="Pinfield D" first="D. J." last="Pinfield">D. J. Pinfield</name></country><country name="Japon"><region name="Région de Kantō"><name sortKey="Tamura, M" sort="Tamura, M" uniqKey="Tamura M" first="M." last="Tamura">M. Tamura</name></region><name sortKey="Nakajima, T" sort="Nakajima, T" uniqKey="Nakajima T" first="T." last="Nakajima">T. Nakajima</name><name sortKey="Tadashi, N" sort="Tadashi, N" uniqKey="Tadashi N" first="N." last="Tadashi">N. Tadashi</name></country><country name="Australie"><noRegion><name sortKey="Tinney, C G" sort="Tinney, C G" uniqKey="Tinney C" first="C. G." last="Tinney">C. G. Tinney</name></noRegion></country><country name="Espagne"><region name="Canaries"><name sortKey="Martfn, E L" sort="Martfn, E L" uniqKey="Martfn E" first="E. L." last="Martfn">E. L. Martfn</name></region><name sortKey="Barrado Y Navascues, D" sort="Barrado Y Navascues, D" uniqKey="Barrado Y Navascues D" first="D." last="Barrado Y Navascues">D. Barrado Y Navascues</name><name sortKey="Magazzu, A" sort="Magazzu, A" uniqKey="Magazzu A" first="A." last="Magazzu">A. Magazzu</name><name sortKey="Zapatero Osorio, M R" sort="Zapatero Osorio, M R" uniqKey="Zapatero Osorio M" first="M. R." last="Zapatero Osorio">M. R. Zapatero Osorio</name></country><country name="États-Unis"><noRegion><name sortKey="Martfn, E L" sort="Martfn, E L" uniqKey="Martfn E" first="E. L." last="Martfn">E. L. Martfn</name></noRegion><name sortKey="Ishii, M" sort="Ishii, M" uniqKey="Ishii M" first="M." last="Ishii">M. Ishii</name><name sortKey="Leggett, S K" sort="Leggett, S K" uniqKey="Leggett S" first="S. K." last="Leggett">S. K. Leggett</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Allard, F" sort="Allard, F" uniqKey="Allard F" first="F." last="Allard">F. Allard</name></region><name sortKey="Baraffe, I" sort="Baraffe, I" uniqKey="Baraffe I" first="I." last="Baraffe">I. Baraffe</name><name sortKey="Chabrier, G" sort="Chabrier, G" uniqKey="Chabrier G" first="G." last="Chabrier">G. Chabrier</name></country><country name="Italie"><region name="Vénétie"><name sortKey="Carraro, G" sort="Carraro, G" uniqKey="Carraro G" first="G." last="Carraro">G. Carraro</name></region></country><country name="République tchèque"><noRegion><name sortKey="Chappelle, R J" sort="Chappelle, R J" uniqKey="Chappelle R" first="R. J." last="Chappelle">R. J. Chappelle</name></noRegion></country><country name="Chili"><noRegion><name sortKey="Clarke, F" sort="Clarke, F" uniqKey="Clarke F" first="F." last="Clarke">F. Clarke</name></noRegion></country><country name="Pays-Bas"><noRegion><name sortKey="Deacon, N" sort="Deacon, N" uniqKey="Deacon N" first="N." last="Deacon">N. Deacon</name></noRegion></country><country name="Ukraine"><noRegion><name sortKey="Pavlenko, Y V" sort="Pavlenko, Y V" uniqKey="Pavlenko Y" first="Y. V." last="Pavlenko">Y. V. Pavlenko</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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