Dynamical Masses of T Tauri Stars and Calibration of PMS Evolution

Abstract

We have used the high sensitivity and resolution of the IRAM interferometer to produce sub-arcsecond 12CO 2-1 images of 9 protoplanetary disks surrounding T Tauri stars in the Taurus-Auriga cloud (7 singles and 2 binaries). The images demonstrate the disks are in Keplerian rotation around their central stars. Using the least square fit method described in Guilloteau and Dutrey (1998), we derive the disk properties, in particular its inclination angle and rotation velocity, hence the dynamical mass. Since the disk mass is usually small, this is a direct measurement of the stellar mass. Typically, we reach an internal precision of 10% in the determinations of stellar mass. The over-all accuracy is limited by the uncertainty in the distance to a specific star. In a distance independent way, we compare the derived masses with theoretical tracks of pre-main-sequence evolution. Combined with the mean distance to the Taurus region (140 pc), for stars with mass close to 1 Msun, our results tend to favor the tracks with cooler photospheres (higher masses for a given spectral type). We find that in UZ Tau E the disk and the spectroscopic binary orbit appear to have different inclinations.

32 pages, 5 figures

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