Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-24T21:41:21.287Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Barshay, S. S. & Lewis, J. S. 1978, Icarus, 33, 593 Google Scholar
Burrows, A., Marley, M. S., Hubbard, W. B., Lunine, J. I., Guillot, T., Saumon, D., Freedman, R. S., Sudarsky, D., & Sharp, C. 1997, ApJ, 491, 856 Google Scholar
Fegley, B. Jr., & Lodders, K. 1994, Icarus, 110, 117 Google Scholar
Fegley, B. Jr., & Lodders, K. 1996, ApJ, 472, L37 CrossRefGoogle Scholar
Fegley, B. Jr., & Prinn, R. G. 1985, ApJ, 299, 1067 Google Scholar
Golimowski, D. A., 2002, in preparation Google Scholar
Griffith, C. A. & Yelle, R. V. 1999, ApJ, 519, L85 Google Scholar
Kirkpatrick, J. D., Reid, I. N., Liebert, J., Cutri, R. M., Nelson, B., Beichman, C. A., Dahn, C. C., Monet, D. G., Gizis, J. E. & Skrutskie, M. F. 1999, ApJ, 519, 834 Google Scholar
Leggett, S. K. et al. 2002, ApJ, 564, 452 Google Scholar
Leggett, S.K., Toomey, D.W., Geballe, T.R. & Brown, R.H. 1999, ApJ, 517, L139 CrossRefGoogle Scholar
Lodders, K. & Fegley, B. Jr. 1994, Icarus, 112, 368 CrossRefGoogle Scholar
Lodders, K. & Fegley, B. Jr. 2002, Icarus, 155, 393 Google Scholar
Marley, M. S., Saumon, D., Guillot, T., Freedman, R. S., Hubbard, W. B., Burrows, A. & Lunine, J. I. 1996, Science, 272, 1919 Google Scholar
Nakajima, T., Oppenheimer, B. R., Kulkarni, S. R., Golimowski, D. A., Matthews, K., & Durrance, S. T. 1995, Nature, 378, 463 CrossRefGoogle Scholar
Noll, K. S., Geballe, T. R. & Marley, M. S. 1997, ApJ, 489, L87 Google Scholar
Oppenheimer, B. R., Kulkarni, S. R., Matthews, K. & Nakajima, T. 1995, Science, 270, 1478 Google Scholar
Oppenheimer, B. R., Kulkarni, S. R., Matthews, K. & van Kerkwijk, M. H. 1998, ApJ, 502, 932 Google Scholar
Prinn, R. G. & Barshay, S. S. 1977, Science, 198, 1031 Google Scholar
Saumon, D., Geballe, T. R., Leggett, S. K., Marley, M. S., Freedman, R. S., Lodders, K., Fegley, B. Jr. & Sengupta, S. K. 2000, ApJ, 541, 374 Google Scholar