Volume 376, Number 1, September II 2001
|Page(s)||194 - 212|
|Section||Interstellar and circumstellar matter|
|Published online||15 September 2001|
Dust in brown dwarfs
I. Dust formation under turbulent conditions on microscopic scales
Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
2 Konrad-Zuse-Zenrum für Informationstechnik Berlin, Takustraße 7, 14195 Berlin, Germany
3 Fachbereich Mathematik und Informatik, Freie Universität Berlin, Takustraße 7, 14195 Berlin, Germany
Corresponding author: Ch. Helling, firstname.lastname@example.org
Accepted: 27 June 2001
Dust formation in turbulent media is studied adopting the example of brown dwarf atmospheres. By combining asymptotic techniques and time-dependent, multi-dimensional numerical simulations, we show that acoustic waves originating from convective motions provide a mechanism to initiate dust nucleation in otherwise dust-hostile environments. The subsequently growing particles cause a radiative cooling strong enough to re-initiate efficient dust formation resulting in a strongly inhomogeneous distribution of dust in such environments. Recent observations bear indications for such cloudy dust distributions in brown dwarf atmospheres.
© ESO, 2001
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