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Chemical composition of dust clouds in turbulent brown dwarf atmospheres

Published online by Cambridge University Press:  01 August 2006

Christiane Helling
Christiane Helling*
Affiliation:
Research and Scientific Support Department ESTEC/ESA, PO Box 299, 2200 AG Noordwijk, The Netherlands email: chelling@esa.int
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Abstract

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Brown dwarf atmospheres are largely convective. These convective gas flows collide and feed back a whole spectrum of turbulent fluctuations into the atmospheric fluid field. Resulting non-static density and temperature fields influence the local chemistry concerning gas phase and dust formation. Numerical simulations are used to show the large and inhomogeneous changes of the gas phase chemistry in a turbulent dust forming cloud region of a brown dwarf atmosphere. The relaxation time scale of the gas phase composition towards steady state is considerably longer than for the dust component.

Keywords

Turbulenceconvectionastrochemistrymethods: numericalstars: low-massbrown dwarfsinfrared: stars

Information

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 224 - 226
Copyright
Copyright © International Astronomical Union 2007

References

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