AAS Meeting #193 - Austin, Texas, January 1999
Session 73. Young Stars
Display, Friday, January 8, 1999, 9:20am-6:30pm, Exhibit Hall 1

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[73.08] A circumstellar dust disk around T Tau N: Sub-arcsecond millimeter imaging

R.L. Akeson (IPAC/Caltech), D.W. Koerner (University of Pennsylvania), E.L.N. Jensen (Swarthmore College)

We present a \lambda=3mm continuum image of the young binary, T Tauri, at sub-arcsecond resolution. This system comprises an optically visible component, T Tau N, and an infrared companion, T Tau S, separated by 0\farcs7. At a resolution of 0\farcs5, the compact dust emission is centered at the position of T Tau N\null, with an integrated flux density of 50 ± 6 mJy. No emission is detected at the position of the infrared companion with a 3\sigma upper limit of 9 mJy.

We infer that the continuum arises from a circumstellar disk around T~Tau~N and estimate its properties by fitting a flat-disk model to measurements at \lambda = 1, 3 and 7~mm. Given the data, probability distributions are calculated for values of the free parameters, including the temperature, density, dust opacity, and the disk outer radius. The mostly likely value for the total disk mass is similar to disk masses derived for single pre-main-sequence stars and to the minimum mass solar nebula.

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