SIMBAD references

2016ApJ...830...96H - Astrophys. J., 830, 96-96 (2016/October-3)

Exploring the role of sub-micron-sized dust grains in the atmospheres of red L0-L6 dwarfs.

HIRANAKA K., CRUZ K.L., DOUGLAS S.T., MARLEY M.S. and BALDASSARE V.F.

Abstract (from CDS):

We examine the hypothesis that the red near-infrared colors of some L dwarfs could be explained by a "dust haze" of small particles in their upper atmospheres. This dust haze would exist in conjunction with the clouds found in dwarfs with more typical colors. We developed a model that uses Mie theory and the Hansen particle size distributions to reproduce the extinction due to the proposed dust haze. We apply our method to 23 young L dwarfs and 23 red field L dwarfs. We constrain the properties of the dust haze including particle size distribution and column density using Markov Chain Monte Carlo methods. We find that sub-micron-range silicate grains reproduce the observed reddening. Current brown dwarf atmosphere models include large-grain (1-100 µm) dust clouds but not sub-micron dust grains. Our results provide a strong proof of concept and motivate a combination of large and small dust grains in brown dwarf atmosphere models.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): brown dwarfs - dust, extinction - dust, extinction

Simbad objects: 56

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2021.06.19-21:53:31

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