期刊
ASTROPHYSICAL JOURNAL
卷 705, 期 2, 页码 1173-1182出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/705/2/1173
关键词
circumstellar matter; open clusters and associations: individual (Taurus, Upper Scorpius); stars: low-mass, brown dwarfs
资金
- Ramon y Cajal fellowship [08-303-01-02]
- NASA
We present Spitzer/IRAC and MIPS 24 mu m 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 mu m but none at shorter wavelengths, and may be a candidate transition disk. Three objects show emission in the 10 mu m 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 mu m observations for the TW Hydrae Association brown dwarf 2MASS J1139511-315921. We discuss the structure and chemistry of brown dwarf disks at ages of similar to 5-10 Myr, and consider the possible effects of the brown dwarf densities in these clusters on the disk lifetimes.
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