CO study of the GM Aurigae Keplerian disk

Astronomy and Astrophysics – Astrophysics

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Stars: T Tauri, Circumstellar Matter, Pre-Main Sequence, Radio-Lines: Stars

Scientific paper

{We report new high resolution (0.6 - 1.7'') images of GM Aur in the ^(12)(CO) J2->1 line and the 1.3 and 2.7 mm continuum. The dust disk, located at the center of the CO disk, is resolved by the 0.6'' beam of the interferometer. We derive a minimum radius of ~ 200 AU, and a total mass (dust+gas) of about ~ 0.025 {M}sun. Our CO observations also resolve the Keplerian rotation of the gas disk. Since the CO emission is optically thick, the CO data does not allow a disk mass measurement but we can estimate the dynamical mass of the system, i.e. the stellar mass, M_* = 0.84 +/- 0.05 x (D/140 pc) {M}sun although a solution with a more inclined disk and lower stellar mass ( 0.6 {M}_{\odot}$) is also possible.}

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