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

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From: LARRY KLAES (ljk4_at_msn.com)
Date: Fri Jun 10 2005 - 14:23:13 PDT

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    Paper: astro-ph/0506204
    Date: Thu, 9 Jun 2005 13:54:28 GMT (472kb)

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

    Authors: Christiane Helling
    Comments: 7 pages, 2 figues, contribution to the Workshop on
    Interdisciplinary
      Aspects of Turbulence, April 18 - 22, 2005, Castle Ringberg, Germany
    \\
      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.

    \\ ( http://arXiv.org/abs/astro-ph/0506204 , 472kb)

  • Next message: LARRY KLAES: "SETI public: Possible Giant Planets at Hundreds of AU in the HD141569 Disk"
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