Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-21
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures, Review to be published in "High Resolution Infrared Spectroscopy in Astronomy", Proceedings of the ESO Wo
Scientific paper
10.1007/10995082_74
Brown dwarfs bridge the gap between the stellar and planetary mass regimes. Evolving from conditions very similar to the lowest-mass stars, the atmospheres of older brown dwarfs closely resemble those expected in close-in extrasolar giant planets, and with cooler BDs still being discovered, more and more approach the properties of gas giants at wider separation. Interpreting the spectra of BDs is therefore a crucial step towards understanding and predicting the spectral and thermal properties of EGPs. Essential properties of substellar atmospheres are massive molecular line-blanketing and the condensation of species with decreasing Teff, changing the chemical equilibrium composition and causing absorption from dust grains. More complex details involve the distribution of dust clouds over the surface giving rise to temporal variability, and possible deviations from chemical equilibrium conditions. In the case of close-in EGPs and some BDs in binary systems, the effect of irradiation from the primary significantly affects the spectral properties and thermal evolution.
Allard France
Barman Travis S.
Baron Edward A.
Hauschildt Peter. H.
Homeier Derek
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