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Disks in the UYAur Binary

G.Duvert tex2html_wrap_inline1968 , A.Dutrey tex2html_wrap_inline1978 , S.Guilloteau tex2html_wrap_inline1978 , F.Ménard tex2html_wrap_inline1968 , K.Schuster tex2html_wrap_inline1978 , L.Prato tex2html_wrap_inline1974 , M. Simon tex2html_wrap_inline1974
tex2html_wrap_inline1968 Laboratoire d'Astrophysique de Grenoble, B.P. 53X, 38041 Grenoble Cedex, France
tex2html_wrap_inline1978 Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères
tex2html_wrap_inline1974 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 tex2html_wrap_inline2216 tex2html_wrap_inline1734 and tex2html_wrap_inline1736 which reveal evidence for a large ( tex2html_wrap_inline2233 ) 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 tex2html_wrap_inline1984 1.2 tex2html_wrap_inline2237 provides a good fit to the velocity data. However, tex2html_wrap_inline2216 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