Clouds and Clearings in the Atmospheres of the L and T Dwarfs

Details Clouds and Clearings in the Atmospheres of the L and T Dwarfs Clouds and Clearings in the Atmospheres of the L and T Dwarfs

2002-07-31

arxiv.org/abs/astro-ph/0207658v1

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures, in newpasp.sty format, To appear in "IAU Symposium 211: Brown Dwarfs", E.L. Martin Ed., Publications of t

Scientific paper

A sophisticated approach to condensate opacity is required to properly model the atmospheres of L and T dwarfs. Here we review different models for the treatment of condensates in brown dwarf atmospheres. We conclude that models which include both particle sedimentation and upwards transport of condensate (both gas and particles) provide the best fit for the L dwarf colors. While a globally uniform cloud model fits the L dwarf data, it turns to the blue in J-K too slowly to fit the T dwarfs. Models which include local clearings in the global cloud deck, similar to Jupiter's prominent five-micron hot spots, better reproduce the available photometric data and also account for the observed resurgence of FeH absorption in early type T dwarfs.

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