A Search for Warm Circumstellar Disks in the TW Hydrae Association | Zendy

Alycia J. Weinberger | Zendy; E. E. Becklin | Zendy; B. Zuckerman | Zendy; Inseok Song | Zendy

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A Search for Warm Circumstellar Disks in the TW Hydrae Association

Author(s) -

Alycia J. Weinberger,

E. E. Becklin,

B. Zuckerman,

Inseok Song

Publication year - 2004

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/382519

Subject(s) - circumstellar dust , stars , physics , circumstellar disk , zodiacal light , photometry (optics) , astrophysics , planet , astronomy

A search for previously undetected optically thin disks around stars in thenearby, young, TW Hydrae Association was conducted around sixteen stars withsensitive 12 and 18 micron photometry. The survey could detect Zodiacal-likedust, with temperature 200-300 K, at levels of L(IR)/L(*)=7e-3. Possiblemid-infrared excess emission from TWA 17 was detected at the 2-sigma level, butnone of the other stars showed evidence for circumstellar dust. The rapiddisappearance of large amounts of dust around the K and M-type stars in thissample may mean that any planet formation in the terrestrial planet region wascompleted very quickly. There appears to be a bi-modal distribution of dustdisks in TWA with stars having either copious or negligible warm dust.Comment: Accepted to AJ for April 2004 issu

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