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Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey

Identifieur interne : 008820 ( Main/Exploration ); précédent : 008819; suivant : 008821

Fifteen 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 :

RBID : ISTEX:04A8ACBF7D50C78B2AE8871DDA5F20C4712A17E3

Descripteurs français

English descriptors

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.

Url:
DOI: 10.1111/j.1365-2966.2008.13729.x


Affiliations:


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<name sortKey="Mccaughrean, M J" sort="Mccaughrean, M J" uniqKey="Mccaughrean M" first="M. J." last="Mccaughrean">M. J. Mccaughrean</name>
<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">
<country xml:lang="fr">Japon</country>
<wicri:regionArea>National Astronomical Observatory, Mitaka, Tokyo 181‐8588</wicri:regionArea>
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<settlement type="city">Tokyo</settlement>
<region type="région">Région de Kantō</region>
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</affiliation>
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<author>
<name sortKey="Pavlenko, Y" sort="Pavlenko, Y" uniqKey="Pavlenko Y" first="Y." last="Pavlenko">Y. Pavlenko</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Ukraine</country>
<wicri:regionArea>Main Astronomical Observatory, National Academy of Sciences, Zabolotnoho 27, Kyiv‐127 03680</wicri:regionArea>
<wicri:noRegion>Kyiv‐127 03680</wicri:noRegion>
</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">
<country xml:lang="fr">Australie</country>
<wicri:regionArea>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052</wicri:regionArea>
<wicri:noRegion>NSW 2052</wicri:noRegion>
</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">390</biblScope>
<biblScope unit="issue">1</biblScope>
<biblScope unit="page" from="304">304</biblScope>
<biblScope unit="page" to="322">322</biblScope>
<biblScope unit="page-count">19</biblScope>
<publisher>Blackwell Publishing Ltd</publisher>
<pubPlace>Oxford, UK</pubPlace>
<date type="published" when="2008-10-11">2008-10-11</date>
</imprint>
<idno type="ISSN">0035-8711</idno>
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<seriesStmt>
<idno type="ISSN">0035-8711</idno>
</seriesStmt>
</fileDesc>
<profileDesc>
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<keywords scheme="KwdEn" xml:lang="en">
<term>2mass</term>
<term>Abba pattern</term>
<term>Ames</term>
<term>Ames models</term>
<term>Arcsec</term>
<term>Binary</term>
<term>Birth rate</term>
<term>Bluer</term>
<term>Brown dwarf stars</term>
<term>Burgasser</term>
<term>Chiu</term>
<term>Color</term>
<term>Colour</term>
<term>Colours</term>
<term>Constraint</term>
<term>Data release</term>
<term>Deacon hambly</term>
<term>Deg2</term>
<term>Depth limit</term>
<term>Distance constraints</term>
<term>Dwarf</term>
<term>Dwarf candidates</term>
<term>Dwarf numbers</term>
<term>Dwarf population</term>
<term>Dwarf populations</term>
<term>Dwarf sample</term>
<term>Dwarf spectra</term>
<term>Effective temperature</term>
<term>Geballe</term>
<term>Gemini</term>
<term>Gemini observatory</term>
<term>Gnirs</term>
<term>Good level</term>
<term>Hambly</term>
<term>Hewett</term>
<term>Individual exposure times</term>
<term>Infrared star</term>
<term>Infrared surveys</term>
<term>Journal compilation</term>
<term>July</term>
<term>Kendall</term>
<term>Kirkpatrick</term>
<term>Larger volume</term>
<term>Leggett</term>
<term>Liris</term>
<term>Lodieu</term>
<term>Low-mass stars</term>
<term>Lower teff</term>
<term>Lter</term>
<term>Marley</term>
<term>Mass function</term>
<term>Metallicity</term>
<term>Mnras</term>
<term>Model predictions</term>
<term>Morphology</term>
<term>National science foundation</term>
<term>Optical photometry</term>
<term>Optical sources</term>
<term>Photometric</term>
<term>Photometry</term>
<term>Physical properties</term>
<term>Proc</term>
<term>Saumon</term>
<term>Sdss</term>
<term>Search criteria</term>
<term>Secondary standards</term>
<term>Sky surveys</term>
<term>Solar neighborhood</term>
<term>Source density</term>
<term>Spectral</term>
<term>Spectral morphology</term>
<term>Spectral peaks</term>
<term>Spectral type</term>
<term>Spectral type range</term>
<term>Spectral types</term>
<term>Spectroscopic</term>
<term>Spectroscopy</term>
<term>Subaru telescope</term>
<term>Substellar</term>
<term>Substellar mass function</term>
<term>Surface gravity</term>
<term>Teff</term>
<term>Telluric</term>
<term>Telluric absorption</term>
<term>Texp</term>
<term>Theoretical predictions</term>
<term>Ukidss</term>
<term>Ukirt</term>
<term>Ulas</term>
<term>Unresolved binaries</term>
<term>Unresolved binarity</term>
<term>Unusual metallicity</term>
<term>Wavelength</term>
<term>Wavelength calibration</term>
<term>Wfcam</term>
<term>Yjhk</term>
<term>Zemmi</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr">
<term>Couleur</term>
<term>Etoile IR</term>
<term>Etoile faible masse</term>
<term>Etude IR</term>
<term>Etude ciel</term>
<term>Fonction masse</term>
<term>Gravité surface</term>
<term>Morphologie</term>
<term>Métallicité</term>
<term>Naine brune</term>
<term>Propriété physique</term>
<term>Spectrométrie</term>
<term>Température effective</term>
<term>Type spectral</term>
<term>Voisinage solaire</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en">
<term>2mass</term>
<term>Abba pattern</term>
<term>Ames</term>
<term>Ames models</term>
<term>Arcsec</term>
<term>Binary</term>
<term>Birth rate</term>
<term>Bluer</term>
<term>Burgasser</term>
<term>Chiu</term>
<term>Colour</term>
<term>Colours</term>
<term>Constraint</term>
<term>Data release</term>
<term>Deacon hambly</term>
<term>Deg2</term>
<term>Depth limit</term>
<term>Distance constraints</term>
<term>Dwarf</term>
<term>Dwarf candidates</term>
<term>Dwarf numbers</term>
<term>Dwarf population</term>
<term>Dwarf populations</term>
<term>Dwarf sample</term>
<term>Dwarf spectra</term>
<term>Geballe</term>
<term>Gemini</term>
<term>Gemini observatory</term>
<term>Gnirs</term>
<term>Good level</term>
<term>Hambly</term>
<term>Hewett</term>
<term>Individual exposure times</term>
<term>Journal compilation</term>
<term>July</term>
<term>Kendall</term>
<term>Kirkpatrick</term>
<term>Larger volume</term>
<term>Leggett</term>
<term>Liris</term>
<term>Lodieu</term>
<term>Lower teff</term>
<term>Lter</term>
<term>Marley</term>
<term>Metallicity</term>
<term>Mnras</term>
<term>Model predictions</term>
<term>National science foundation</term>
<term>Optical photometry</term>
<term>Optical sources</term>
<term>Photometric</term>
<term>Photometry</term>
<term>Physical properties</term>
<term>Proc</term>
<term>Saumon</term>
<term>Sdss</term>
<term>Search criteria</term>
<term>Secondary standards</term>
<term>Source density</term>
<term>Spectral</term>
<term>Spectral morphology</term>
<term>Spectral peaks</term>
<term>Spectral type</term>
<term>Spectral type range</term>
<term>Spectral types</term>
<term>Spectroscopic</term>
<term>Subaru telescope</term>
<term>Substellar</term>
<term>Substellar mass function</term>
<term>Surface gravity</term>
<term>Teff</term>
<term>Telluric</term>
<term>Telluric absorption</term>
<term>Texp</term>
<term>Theoretical predictions</term>
<term>Ukidss</term>
<term>Ukirt</term>
<term>Ulas</term>
<term>Unresolved binaries</term>
<term>Unresolved binarity</term>
<term>Unusual metallicity</term>
<term>Wavelength</term>
<term>Wavelength calibration</term>
<term>Wfcam</term>
<term>Yjhk</term>
<term>Zemmi</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr">
<term>Spectrométrie</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">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>
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<list>
<country>
<li>Allemagne</li>
<li>Australie</li>
<li>Chili</li>
<li>Espagne</li>
<li>France</li>
<li>Japon</li>
<li>Pays-Bas</li>
<li>Royaume-Uni</li>
<li>Ukraine</li>
<li>États-Unis</li>
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<li>Auvergne-Rhône-Alpes</li>
<li>Basse-Saxe</li>
<li>Hawaï</li>
<li>Rhône-Alpes</li>
<li>Région de Kantō</li>
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<li>Lyon</li>
<li>Tokyo</li>
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<country name="Japon">
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<name sortKey="Tamura, M" sort="Tamura, M" uniqKey="Tamura M" first="M." last="Tamura">M. Tamura</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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<name sortKey="Homeier, D" sort="Homeier, D" uniqKey="Homeier D" first="D." last="Homeier">D. Homeier</name>
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<name sortKey="Pavlenko, Y" sort="Pavlenko, Y" uniqKey="Pavlenko Y" first="Y." last="Pavlenko">Y. Pavlenko</name>
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