Disks in the UYAur Binary

G.Duvert , A.Dutrey , S.Guilloteau , F.Ménard , K.Schuster , L.Prato , M. Simon
Laboratoire d'Astrophysique de Grenoble, B.P. 53X, 38041 Grenoble Cedex, France
Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères
Dept. of Physics and Astronomy, State Univ. of New York, Stony Brook, NY 11794 3800, U.S.A.
Abstract: We report interferometric images of the UY Aur binary in and which reveal evidence for a large ( ) circumbinary disk around the two pre-main-sequence stars. This is the second detection of a circumbinary disk around T Tauri stars. A Keplerian rotation curve around a central mass of 1.2 provides a good fit to the velocity data. However, emission at a systemic velocity close to the binary limits the accuracy of our disk model and a precise assessment of the disk mass. This emission could be related to the ``streamers'' imaged with adaptive optics around UY Aur. The continuum emission detected at the location of the binary can be attributed to partially resolved circumstellar disks around each star, with some possible contribution of free-free emission.
To be published in A&A main Journal. Electronic version available at http://www-laog.obs.ujf-grenoble.fr/liens/starform/formation.html