AustralieFrV1, Main, Exploration, bibRecord, 005869

THE PROPERTIES OF THE 500 K DWARF UGPS J072227.51-054031.2 AND A STUDY OF THE FAR-RED FLUX OF COLD BROWN DWARFS

Identifieur interne : 005869 ( Main/Exploration ); précédent : 005868; suivant : 005870

THE PROPERTIES OF THE 500 K DWARF UGPS J072227.51-054031.2 AND A STUDY OF THE FAR-RED FLUX OF COLD BROWN DWARFS

Auteurs : S. K. Leggett [États-Unis] ; D. Saumon [États-Unis] ; M. S. Marley [États-Unis] ; K. Lodders [États-Unis] ; J. Canty [Royaume-Uni] ; P. Lucas [Royaume-Uni] ; R. L. Smart [Italie] ; C. G. Tinney [Australie] ; D. Homeier [France] ; F. Allard [France] ; Ben Burningham [Royaume-Uni] ; A. Day-Jones [Chili] ; B. Fecley [États-Unis] ; Miki Ishii [États-Unis] ; H. R. A. Jones [Royaume-Uni] ; F. Marocco [Royaume-Uni] ; D. J. Pinfield [Royaume-Uni] ; M. Tamura [Japon]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:12-0333193

Descripteurs français

Pascal (Inist)
- Naine brune, Photométrie, Couleur, Saturation, Astrométrie, Densité spectrale énergie, Modèle, Age, Cinématique, Champ proche, Soleil, Rotateur, Mélangeage, Spectre optique, Température atmosphérique, Profil raie, Abondance stellaire.

English descriptors

KwdEn :
- Age, Astrometry, Atmospheric temperature, Brown dwarf stars, Color, Kinematics, Line shape, Mixing, Models, Near field, Optical spectrum, Photometry, Rotator, Saturation, Spectral energy distribution, Stellar abundance, Sun.

Abstract

We present i and z photometry for 25 T dwarfs and 1 L dwarf. Combined with published photometry, the data show that the i - z, z - Y, and z - J colors of T dwarfs are very red, and continue to increase through to the late-type T dwarfs, with a hint of a saturation for the latest types with T_eff ≃ 600 K. We present new 0.7-1.0 μm and 2.8-4.2 μm spectra for the very late type T dwarf UGPS J072227.51-054031.2, as well as improved astrometry for this dwarf. Examination of the spectral energy distribution using new and published data, with Saumon & Marley models, shows that the dwarf has T_eff = 505 ± 10 K, a mass of 3-11 M_Jupiter, and an age between 60 Myr and 1 Gyr. This young age is consistent with the thin disk kinematics of the dwarf. The mass range overlaps with that usually considered to be planetary, despite this being an unbound object discovered in the field near the Sun. This apparently young rapid rotator is also undergoing vigorous atmospheric mixing, as determined by the IRAC and WISE 4.5 μm photometry and the Saumon & Marley models. The optical spectrum for this 500 K object shows clearly detected lines of the neutral alkalis Cs and Rb, which are emitted from deep atmospheric layers with temperatures of 900-1200 K.

Affiliations:

Australie, Chili, France, Italie, Japon, Royaume-Uni, États-Unis
Auvergne-Rhône-Alpes, Rhône-Alpes, Région de Kantō
Lyon, Tokyo

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Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">THE PROPERTIES OF THE 500 K DWARF UGPS J072227.51-054031.2 AND A STUDY OF THE FAR-RED FLUX OF COLD BROWN DWARFS</title>
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<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="09"><s1>Universidad de Chile, Camino el Observatorio No. 1515, Santiago</s1>
<s2>Casilla 36-D</s2>
<s3>CHL</s3>
<sZ>12 aut.</sZ>
</inist:fA14>
<country>Chili</country>
<wicri:noRegion>Casilla 36-D</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Fecley, B" sort="Fecley, B" uniqKey="Fecley B" first="B." last="Fecley">B. Fecley</name>
<affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Planetary Chemistry Laboratory, Department of Earth and Planetary Sciences, McDonnell Center for the Space Sciences, Washington University</s1>
<s2>St. Louis, MO 63130-4899</s2>
<s3>USA</s3>
<sZ>4 aut.</sZ>
<sZ>13 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>St. Louis, MO 63130-4899</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Ishii, Miki" sort="Ishii, Miki" uniqKey="Ishii M" first="Miki" last="Ishii">Miki Ishii</name>
<affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place</s1>
<s2>Hilo, HI 96720</s2>
<s3>USA</s3>
<sZ>14 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>Hilo, HI 96720</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="05"><s1>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire</s1>
<s2>Hatfield AL10 9AB</s2>
<s3>GBR</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>11 aut.</sZ>
<sZ>15 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
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<country>Royaume-Uni</country>
<wicri:noRegion>Hatfield AL10 9AB</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Marocco, F" sort="Marocco, F" uniqKey="Marocco F" first="F." last="Marocco">F. Marocco</name>
<affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire</s1>
<s2>Hatfield AL10 9AB</s2>
<s3>GBR</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>11 aut.</sZ>
<sZ>15 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
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<country>Royaume-Uni</country>
<wicri:noRegion>Hatfield AL10 9AB</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="05"><s1>Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire</s1>
<s2>Hatfield AL10 9AB</s2>
<s3>GBR</s3>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>11 aut.</sZ>
<sZ>15 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
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<country>Royaume-Uni</country>
<wicri:noRegion>Hatfield AL10 9AB</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="11"><s1>National Astronomical Observatory of Japan, 2-21-1 Osawa</s1>
<s2>Mitaka, Tokyo 181-8588</s2>
<s3>JPN</s3>
<sZ>18 aut.</sZ>
</inist:fA14>
<country>Japon</country>
<placeName><settlement type="city">Tokyo</settlement>
<region type="région">Région de Kantō</region>
</placeName>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">The Astrophysical journal</title>
<title level="j" type="abbreviated">Astrophys. j.</title>
<idno type="ISSN">0004-637X</idno>
<imprint><date when="2012">2012</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt><title level="j" type="main">The Astrophysical journal</title>
<title level="j" type="abbreviated">Astrophys. j.</title>
<idno type="ISSN">0004-637X</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Age</term>
<term>Astrometry</term>
<term>Atmospheric temperature</term>
<term>Brown dwarf stars</term>
<term>Color</term>
<term>Kinematics</term>
<term>Line shape</term>
<term>Mixing</term>
<term>Models</term>
<term>Near field</term>
<term>Optical spectrum</term>
<term>Photometry</term>
<term>Rotator</term>
<term>Saturation</term>
<term>Spectral energy distribution</term>
<term>Stellar abundance</term>
<term>Sun</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Naine brune</term>
<term>Photométrie</term>
<term>Couleur</term>
<term>Saturation</term>
<term>Astrométrie</term>
<term>Densité spectrale énergie</term>
<term>Modèle</term>
<term>Age</term>
<term>Cinématique</term>
<term>Champ proche</term>
<term>Soleil</term>
<term>Rotateur</term>
<term>Mélangeage</term>
<term>Spectre optique</term>
<term>Température atmosphérique</term>
<term>Profil raie</term>
<term>Abondance stellaire</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">We present i and z photometry for 25 T dwarfs and 1 L dwarf. Combined with published photometry, the data show that the i - z, z - Y, and z - J colors of T dwarfs are very red, and continue to increase through to the late-type T dwarfs, with a hint of a saturation for the latest types with T<sub>eff</sub>
 ≃ 600 K. We present new 0.7-1.0 μm and 2.8-4.2 μm spectra for the very late type T dwarf UGPS J072227.51-054031.2, as well as improved astrometry for this dwarf. Examination of the spectral energy distribution using new and published data, with Saumon & Marley models, shows that the dwarf has T<sub>eff</sub>
 = 505 ± 10 K, a mass of 3-11 M<sub>Jupiter</sub>
, and an age between 60 Myr and 1 Gyr. This young age is consistent with the thin disk kinematics of the dwarf. The mass range overlaps with that usually considered to be planetary, despite this being an unbound object discovered in the field near the Sun. This apparently young rapid rotator is also undergoing vigorous atmospheric mixing, as determined by the IRAC and WISE 4.5 μm photometry and the Saumon & Marley models. The optical spectrum for this 500 K object shows clearly detected lines of the neutral alkalis Cs and Rb, which are emitted from deep atmospheric layers with temperatures of 900-1200 K.</div>
</front>
</TEI>
<affiliations><list><country><li>Australie</li>
<li>Chili</li>
<li>France</li>
<li>Italie</li>
<li>Japon</li>
<li>Royaume-Uni</li>
<li>États-Unis</li>
</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Rhône-Alpes</li>
<li>Région de Kantō</li>
</region>
<settlement><li>Lyon</li>
<li>Tokyo</li>
</settlement>
</list>
<tree><country name="États-Unis"><noRegion><name sortKey="Leggett, S K" sort="Leggett, S K" uniqKey="Leggett S" first="S. K." last="Leggett">S. K. Leggett</name>
</noRegion>
<name sortKey="Fecley, B" sort="Fecley, B" uniqKey="Fecley B" first="B." last="Fecley">B. Fecley</name>
<name sortKey="Ishii, Miki" sort="Ishii, Miki" uniqKey="Ishii M" first="Miki" last="Ishii">Miki Ishii</name>
<name sortKey="Lodders, K" sort="Lodders, K" uniqKey="Lodders K" first="K." last="Lodders">K. Lodders</name>
<name sortKey="Marley, M S" sort="Marley, M S" uniqKey="Marley M" first="M. S." last="Marley">M. S. Marley</name>
<name sortKey="Saumon, D" sort="Saumon, D" uniqKey="Saumon D" first="D." last="Saumon">D. Saumon</name>
</country>
<country name="Royaume-Uni"><noRegion><name sortKey="Canty, J" sort="Canty, J" uniqKey="Canty J" first="J." last="Canty">J. Canty</name>
</noRegion>
<name sortKey="Burningham, Ben" sort="Burningham, Ben" uniqKey="Burningham B" first="Ben" last="Burningham">Ben Burningham</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="Lucas, P" sort="Lucas, P" uniqKey="Lucas P" first="P." last="Lucas">P. Lucas</name>
<name sortKey="Marocco, F" sort="Marocco, F" uniqKey="Marocco F" first="F." last="Marocco">F. Marocco</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="Italie"><noRegion><name sortKey="Smart, R L" sort="Smart, R L" uniqKey="Smart R" first="R. L." last="Smart">R. L. Smart</name>
</noRegion>
</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="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Homeier, D" sort="Homeier, D" uniqKey="Homeier D" first="D." last="Homeier">D. Homeier</name>
</region>
<name sortKey="Allard, F" sort="Allard, F" uniqKey="Allard F" first="F." last="Allard">F. Allard</name>
</country>
<country name="Chili"><noRegion><name sortKey="Day Jones, A" sort="Day Jones, A" uniqKey="Day Jones A" first="A." last="Day-Jones">A. Day-Jones</name>
</noRegion>
</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>
</country>
</tree>
</affiliations>
</record>

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THE PROPERTIES OF THE 500 K DWARF UGPS J072227.51-054031.2 AND A STUDY OF THE FAR-RED FLUX OF COLD BROWN DWARFS

THE PROPERTIES OF THE 500 K DWARF UGPS J072227.51-054031.2 AND A STUDY OF THE FAR-RED FLUX OF COLD BROWN DWARFS

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