期刊
ASTROPHYSICAL JOURNAL
卷 754, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/754/1/39
关键词
brown dwarfs; circumstellar matter; open clusters and associations: individual (TW Hydrae association); stars: evolution; stars: low-mass; stars: pre-main sequence
资金
- National Aeronautics and Space Administration
- National Science Foundation
- Wide-field Infrared Survey Explorer
- National Science Foundation [AST-1003318]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1003318] Funding Source: National Science Foundation
We assess the current membership of the nearby, young TW Hydrae association and examine newly proposed members with the Wide-field Infrared Survey Explorer (WISE) to search for infrared excess indicative of circumstellar disks. Newly proposed members TWA 30A, TWA 30B, TWA 31, and TWA 32 all show excess emission at 12 and 22 mu m providing clear evidence for substantial dusty circumstellar disks around these low-mass, similar to 8 Myr old stars that were previously shown to likely be accreting circumstellar material. TWA 30B shows large amounts of self-extinction, likely due to an edge-on disk geometry. We also confirm previously reported circumstellar disks with WISE and determine a 22 mu m excess fraction of 42(-9)(+10)% based on our results.
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