The Role of Dust Clouds in the Atmospheres of Brown Dwarfs

Details The Role of Dust Clouds in the Atmospheres of Brown Dwarfs The Role of Dust Clouds in the Atmospheres of Brown Dwarfs

2009-02-10

arxiv.org/abs/0902.1777v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

To be published in the proceedings of "Cosmic Dust - Near and Far," eds Th. Henning, E. Grun, J. Steinacker, (Astronomical Soc

Scientific paper

The new spectroscopic classes, L and T, are defined by the role of dust clouds in their atmospheres, the former by their presence and the latter by their removal and near absence. Moreover, the M to L and L to T transitions are intimately tied to the condensation and character of silicate and iron grains, and the associated clouds play pivotal roles in the colors and spectra of such brown dwarfs. Spanning the effective temperature range from $\sim$2200 K to $\sim$600 K, these objects are being found in abundance and are a new arena in which condensation chemistry and the optical properties of grains is assuming astronomical importance. In this short paper, I summarize the role played by such refractories in determining the properties of these "stars" and the complexities of their theoretical treatment.

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