Non-equilibrium chemistry in the atmospheres of brown dwarfs

Details Non-equilibrium chemistry in the atmospheres of brown dwarfs Non-equilibrium chemistry in the atmospheres of brown dwarfs

2002-07-02

arxiv.org/abs/astro-ph/0207070v1

Astronomy and Astrophysics

Astrophysics

9 pages, 4 figures, to appear in the proceedings of the IAU symposium 211 on "Brown dwarfs"

Scientific paper

Carbon monoxide and ammonia have been detected in the spectrum of Gl 229B at abundances that differ substantially from those obtained from chemical equilibrium. Vertical mixing in the atmosphere is a mechanism that can drive slowly reacting species out of chemical equilibrium. We explore the effects of vertical mixing as a function of mixing efficiency and effective temperature on the chemical abundances in the atmospheres of brown dwarfs and on their spectra. The models compare favorably with the observational evidence and indicate that vertical mixing plays an important role in brown dwarf atmospheres.

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