Observations of Condensate Clouds in L and T Dwarfs

Details Observations of Condensate Clouds in L and T Dwarfs Observations of Condensate Clouds in L and T Dwarfs

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9603c&link_type=abstract

American Astronomical Society Meeting 210, #96.03; Bulletin of the American Astronomical Society, Vol. 39, p.225

Astronomy and Astrophysics

Astronomy

Scientific paper

The presence of condensates (i.e., dust) in the atmospheres of L and T dwarfs has a dramatic impact on the atmospheric structure of these ultracool dwarfs. Condensates alter the atmospheric chemistry and contribute their own opacity, which can be substantial for the more abundance Fe-, Mg-, and Si-bearing species. I will discuss how the presence of these condensates affects the emergent spectra of L and T dwarfs. In particular, using the model atmospheres of Marley & Saumon I will show that the spectra of the reddest L dwarfs can only be fitted with a model containing thick condensate clouds. Finally I will discuss the still tentative direct detection of the silicate cloud deck at 10 microns in the Spitzer spectra of mid-type L dwarfs.

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