Spatially Resolving the Inner Disk of TW Hydrae | Zendy

J. A. Eisner | Zendy; Eugene Chiang | Zendy; Lynne A. Hillenbrand | Zendy

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Spatially Resolving the Inner Disk of TW Hydrae

Author(s) -

J. A. Eisner,

Eugene Chiang,

Lynne A. Hillenbrand

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/500689

Subject(s) - physics , interferometry , wavelength , astrophysics , debris disk , circumstellar disk , astronomy , optics , stars , planetary system

We present Keck Interferometer observations of TW Hya that spatially resolveits emission at 2 micron wavelength. Analyzing these data together withexisting K-band veiling and near-infrared photometric measurements, we concludethat the inner disk consists of optically thin, sub-micron-sized dust extendingfrom ~4 AU to within 0.06 AU of the central star. The inner disk edge may bemagnetospherically truncated. Even if we account for the presence of gas in theinner disk, these small dust grains have survival times against radiationblow-out that are orders of magnitude shorter than the age of the system,suggesting continual replenishment through collisions of larger bodies.Comment: 11 pages, including 2 figures. Accepted by ApJ

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