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Titolo:
Molecular abundances in the atmosphere of the T dwarf G1 229B
Autore:
Saumon, D; Geballe, TR; Leggett, SK; Marley, MS; Freedman, RS; Lodders, K; Fegley, B; Sengupta, SK;
Indirizzi:
Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 & Astron, Nashville, TN 37235 USA Gemini N Observ, Hilo, HI 96720 USA Gemini N Observ Hilo HI USA 96720Gemini N Observ, Hilo, HI 96720 USA Joint Astron Ctr, Hilo, HI 96720 USA Joint Astron Ctr Hilo HI USA 96720Joint Astron Ctr, Hilo, HI 96720 USA New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA New Mexico State Univ Las Cruces NM USA 88003 n, Las Cruces, NM 88003 USA NASA, Ames Res Ctr, Space Phys Res Inst, Moffett Field, CA 94035 USA NASAMoffett Field CA USA 94035 hys Res Inst, Moffett Field, CA 94035 USA Washington Univ, Dept Earth & Planetary Sci, Planetary Chem Lab, St Louis,MO 63130 USA Washington Univ St Louis MO USA 63130 ary Chem Lab, St Louis,MO 63130 USA Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 & Astron, Nashville, TN 37235 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 541, anno: 2000,
parte:, 1
pagine: 374 - 389
SICI:
0004-637X(20000920)541:1<374:MAITAO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
COOL BROWN DWARF; GLIESE 229B; CARBON-MONOXIDE; GIANT PLANETS; CHEMISTRY; SPECTRUM; JUPITER; METHANE; DISCOVERY; MODELS;
Keywords:
stars : abundances; stars : atmospheres; stars : individual (G1 229B); stars : low-mass, brown dwarfs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Saumon, D Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 Nashville, TN 37235 USA
Citazione:
D. Saumon et al., "Molecular abundances in the atmosphere of the T dwarf G1 229B", ASTROPHYS J, 541(1), 2000, pp. 374-389

Abstract

We present new high-resolution infrared spectra of the T dwarf Gliese 229Bin the J, H, and K bandpasses. We analyze each of these as well as previously published spectra to determine its metallicity and the abundances of NH, and CO in terms of the surface gravity of G1 229B, which remains poorly constrained. The metallicity increases with increasing gravity and is below the solar value unless G1 229B is a high-gravity brown dwarf with log g (cgs) approximate to 5.5. The NH3 abundance is determined from both the Hand the K-band spectra, which probe two different levels in the atmosphere. We find that the abundance from the K-band data is well below that expected from chemical equilibrium, which we interpret as strong evidence for dynamicaltransport of NH3 in the atmosphere. This is consistent with the previous detection of CO and provides additional constraints on the dynamics of the atmosphere of this T dwarf.

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Documento generato il 25/02/18 alle ore 12:42:11