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Non-equilibrium Chemistry in the Atmospheres of Brown Dwarfs

Published online by Cambridge University Press:  26 May 2016

D. Saumon ,
M. S. Marley ,
K. Lodders  and
R. S. Freedman
D. Saumon
Affiliation:
Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235
M. S. Marley
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035
K. Lodders
Affiliation:
Dept. of Earth & Planetary Science, Washington University, St-Louis, MO 63130–4899
R. S. Freedman
Affiliation:
The Space Physics Research Institute, NASA Ames Research Center, Moffett Field, CA 94035

Abstract

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Carbon monoxide and ammonia have been detected in the spectrum of G1 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.

Type
Part 7. Atmospheres and Internal Structure
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 345 - 353
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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