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Basmah Riaz et al. 2009 ApJ 705 1173 doi:10.1088/0004-637X/705/2/1173

BROWN DWARF DISKS AT AGES OF 5-10 Myr

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Basmah Riaz1,2, Nicolas Lodieu1,2 and John E. Gizis3

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Abstract References Cited By

We present Spitzer/IRAC and MIPS 24 μm observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%+8.7% –3.3%. One object shows a small excess at 24 μm but none at shorter wavelengths, and may be a candidate transition disk. Three objects show emission in the 10 μm silicate feature and we present compositional fits for these sources. Flat structures are observed for all disk sources in UppSco. Also presented are the MIPS/70 μm observations for the TW Hydrae Association brown dwarf 2MASS J1139511–315921. We discuss the structure and chemistry of brown dwarf disks at ages of ~5-10 Myr, and consider the possible effects of the brown dwarf densities in these clusters on the disk lifetimes.


Keywords

circumstellar matter; open clusters and associations: individual (Taurus, Upper Scorpius); stars: low-mass, brown dwarfs


Dates

Issue 2 (2009 November 1)

Received 2009 July 28, accepted for publication 2009 September 23

Published 2009 October 19



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