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Eight new T4.5–T7.5 dwarfs discovered in the UKIDSS Large Area Survey Data Release 1

Identifieur interne : 009172 ( Main/Exploration ); précédent : 009171; suivant : 009173

Eight new T4.5–T7.5 dwarfs discovered in the UKIDSS Large Area Survey Data Release 1

Auteurs : N. Lodieu [Espagne] ; D. J. Pinfield ; S. K. Leggett [États-Unis] ; R. F. Jameson ; D. J. Mortlock ; S. J. Warren ; B. Burningham ; P. W. Lucas ; K. Chiu ; M. C. Liu [États-Unis, Espagne] ; B. P. Venemans ; R. G. Mcmahon ; F. Allard [France] ; I. Baraffe [France] ; D. Barrado Y Navascués [Espagne] ; G. Carraro [Chili] ; S. L. Casewell ; G. Chabrier ; R. J. Chappelle [République tchèque] ; F. Clarke [Royaume-Uni] ; A. C. Day-Jones ; N. R. Deacon [Pays-Bas] ; P. D. Dobbie [Australie] ; S. L. Folkes ; N. C. Hambly ; P. C. Hewett ; S. T. Hodgkin ; H. R. A. Jones ; T. R. Kendall ; A. Magazzù [Espagne] ; E. L. Martín [Espagne] ; M. J. Mccaughrean ; T. Nakajima [Japon] ; Y. Pavlenko [Ukraine] ; M. Tamura [Japon] ; C. G. Tinney [Australie] ; M. R. Zapatero Osorio [Espagne]

Source :

RBID : ISTEX:32DF31BCABDFEF6F46FD80FF8D429E0047EAF81C

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English descriptors

Abstract

We present eight new T4.5–T7.5 dwarfs identified in the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) Data Release 1 (DR1). In addition we have recovered the T4.5 dwarf SDSS J020742.91+000056.2 and the T8.5 dwarf ULAS J003402.77−005206.7. Photometric candidates were picked up in two‐colour diagrams over 190 deg2 (DR1) and selected in at least two filters. All candidates exhibit near‐infrared spectra with strong methane and water absorption bands characteristic of T dwarfs and the derived spectral types follow the unified scheme of Burgasser et al.. We have found six new T4.5–T5.5 dwarfs, one T7 dwarf, one T7.5 dwarf and recovered a T4.5 dwarf and a T8.5 dwarf. We provide distance estimates which lie in the 15–85 pc range; the T7.5 and T8.5 dwarfs are probably within 25 pc of the Sun. We conclude with a discussion of the number of T dwarfs expected after completion of the LAS, comparing these initial results to theoretical simulations.

Url:
DOI: 10.1111/j.1365-2966.2007.12023.x


Affiliations:


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Le document en format XML

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<author>
<name sortKey="Mccaughrean, M J" sort="Mccaughrean, M J" uniqKey="Mccaughrean M" first="M. J." last="Mccaughrean">M. J. Mccaughrean</name>
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<name sortKey="Nakajima, T" sort="Nakajima, T" uniqKey="Nakajima T" first="T." last="Nakajima">T. Nakajima</name>
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<wicri:regionArea>National Astronomical Observatory, Mitaka, Tokyo 181‐8588</wicri:regionArea>
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<region type="région">Région de Kantō</region>
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<author>
<name sortKey="Pavlenko, Y" sort="Pavlenko, Y" uniqKey="Pavlenko Y" first="Y." last="Pavlenko">Y. Pavlenko</name>
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<country xml:lang="fr">Ukraine</country>
<wicri:regionArea>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho 27, Kyiv‐127 03680</wicri:regionArea>
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</author>
<author>
<name sortKey="Tamura, M" sort="Tamura, M" uniqKey="Tamura M" first="M." last="Tamura">M. Tamura</name>
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<wicri:regionArea>National Astronomical Observatory, Mitaka, Tokyo 181‐8588</wicri:regionArea>
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<name sortKey="Tinney, C G" sort="Tinney, C G" uniqKey="Tinney C" first="C. G." last="Tinney">C. G. Tinney</name>
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<wicri:regionArea>Anglo‐Australian Observatory, PO Box 296, Epping 1710</wicri:regionArea>
<wicri:noRegion>Epping 1710</wicri:noRegion>
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<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>
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<wicri:regionArea>Instituto de Astrofísica de Canarias, Vía Láctea s/n, E‐38205 La Laguna, Tenerife</wicri:regionArea>
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<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>
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<publisher>Blackwell Publishing Ltd</publisher>
<pubPlace>Oxford, UK</pubPlace>
<date type="published" when="2007-08-21">2007-08-21</date>
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<idno type="ISSN">0035-8711</idno>
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<idno type="ISSN">0035-8711</idno>
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<keywords scheme="KwdEn" xml:lang="en">
<term>Absolute magnitude</term>
<term>Absorption band</term>
<term>Allard</term>
<term>Arcsec</term>
<term>Astronomy research council</term>
<term>Binary systems</term>
<term>Brown dwarf stars</term>
<term>Burgasser</term>
<term>Colour cuts</term>
<term>Colours</term>
<term>Czech republic</term>
<term>Data release</term>
<term>Deacon hambly</term>
<term>Deg2</term>
<term>Distance estimates</term>
<term>Dwarf</term>
<term>Dwarf candidates</term>
<term>Dwarf ulas</term>
<term>Geballe</term>
<term>Gemini</term>
<term>Gemini observatory</term>
<term>Greater distance</term>
<term>Hambly</term>
<term>Hewett</term>
<term>Individual exposure times</term>
<term>Infrared star</term>
<term>Infrared surveys</term>
<term>Joint astronomy centre</term>
<term>Journal compilation</term>
<term>Kirkpatrick</term>
<term>Large area survey</term>
<term>Leggett</term>
<term>Low-mass stars</term>
<term>Marley</term>
<term>Mass function</term>
<term>Methane</term>
<term>Mnras</term>
<term>Near infrared spectrum</term>
<term>Nearby stars</term>
<term>Number density</term>
<term>Particle physics</term>
<term>Photometric</term>
<term>Photometry</term>
<term>Point sources</term>
<term>Proper motion</term>
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<term>Méthane</term>
<term>Naine brune</term>
<term>Soleil</term>
<term>Spectre IR proche</term>
<term>Type spectral</term>
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<term>Absolute magnitude</term>
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<term>Arcsec</term>
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<term>Data release</term>
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<term>Gemini</term>
<term>Gemini observatory</term>
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<term>Photometry</term>
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<term>Spectral</term>
<term>Spectral indices</term>
<term>Spectral type</term>
<term>Spectral types</term>
<term>Spectroscopic</term>
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<front>
<div type="abstract" xml:lang="en">We present eight new T4.5–T7.5 dwarfs identified in the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) Data Release 1 (DR1). In addition we have recovered the T4.5 dwarf SDSS J020742.91+000056.2 and the T8.5 dwarf ULAS J003402.77−005206.7. Photometric candidates were picked up in two‐colour diagrams over 190 deg2 (DR1) and selected in at least two filters. All candidates exhibit near‐infrared spectra with strong methane and water absorption bands characteristic of T dwarfs and the derived spectral types follow the unified scheme of Burgasser et al.. We have found six new T4.5–T5.5 dwarfs, one T7 dwarf, one T7.5 dwarf and recovered a T4.5 dwarf and a T8.5 dwarf. We provide distance estimates which lie in the 15–85 pc range; the T7.5 and T8.5 dwarfs are probably within 25 pc of the Sun. We conclude with a discussion of the number of T dwarfs expected after completion of the LAS, comparing these initial results to theoretical simulations.</div>
</front>
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<li>Pays-Bas</li>
<li>Royaume-Uni</li>
<li>République tchèque</li>
<li>Ukraine</li>
<li>États-Unis</li>
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<li>Angleterre</li>
<li>Hawaï</li>
<li>Oxfordshire</li>
<li>Région de Kantō</li>
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