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The need for small-scale turbulence in atmospheres of substellar objects

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0506204v1.pdf (466.1Kb)
Date
09/06/2005
Author
Helling, Christiane
Keywords
QB Astronomy
QC Physics
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Abstract
Brown dwarfs and giant gas planets are substellar objects whose spectral appearance is determined by the chemical composition of the gas and the solids/liquids in the atmosphere. Atmospheres of substellar objects possess two major scale regimes: large-scale convective motions + gravitational settling and small-scale turbulence + dust formation. Turbulence initiates dust formation spot-like on small scale, while the dust feeds back into the turbulent fluid field by its strong radiative cooling. Small, imploding dust containing areas result which eventually become isothermal. Multi-dimensional simulations show that these small-scale dust structures gather into large-scale structures, suggesting the formation of clouds made of dirty dust grains. The chemical composition of the grains, and thereby the chemical evolution of the gas phase, is a function of temperature and depends on the grain's history.
Citation
Helling , C 2005 , The need for small-scale turbulence in atmospheres of substellar objects . in F Kupka & W Hillebrandt (eds) , Proceedings of the Workshop on "Interdisciplinary Aspects of Turbulence" Ringberg Castle, Tegernsee, Germany, April 18 - 22, 2005 . Max-Planck-Institut für Astrophysik , Garching , pp. 152-158 , Talk at Ringberg workshop on "Interdisciplinary Aspects of Turbulence" , Tegernsee , Germany , 18/04/05 . < http://arxiv.org/abs/astro-ph/0506204v1 >
 
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Publication
Proceedings of the Workshop on "Interdisciplinary Aspects of Turbulence" Ringberg Castle, Tegernsee, Germany, April 18 - 22, 2005
Type
Conference item
Rights
Copyright 2005 the Author.
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  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2005iat..work.....K
http://arxiv.org/abs/astro-ph/0506204v1
URI
http://hdl.handle.net/10023/16350

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