A Herschel Search For Cold Dust in Brown Dwarf Disks: First Results

Дата и время публикации : 2011-10-20T17:23:28Z

Авторы публикации и институты :
Paul M. Harvey
Thomas Henning
Francois Menard
Sebastian Wolf
Yao Liu
Lucas A. Cieza
Neal J. Evans II
Ilaria Pascucci
Bruno Merin
Christophe Pinte

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Первичная категория: astro-ph.GA

Все категории : astro-ph.GA

Краткий обзор статьи: We report initial results from a {it Herschel} program to search for far-infrared emission from cold dust around a statistically significant sample of young brown dwarfs. The first three objects in our survey are all detected at 70micron, and we report the first detection of a brown dwarf at 160micron. The flux densities are consistent with the presence of substantial amounts of cold dust in the outer disks around these objects. We modeled the SED’s with two different radiative transfer codes. We find that a broad range of model parameters provides a reasonable fit to the SED’s, but that the addition of our 70micron, and especially the 160micron detection enables strong lower limits to be placed on the disk masses since most of the mass is in the outer disk. We find likely disk masses in the range of a few $times 10^{-6}$ to $10^{-4}$ msun. Our models provide a good fit to the SED’s and do not require dust settling.

Category: Physics