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Discovery of a Rotating Protoplanetary Gas Disk around the Young Star GG Tauri

We have made aperture synthesis 12 CO(J=1-0) observations of a T Tauri star, GG Tau, in Taurus with 8″ resolution using the Nobeyama Millimeter Array (NMA). We have discovered a rotating gas disk having a radius of about 500 AU around GG Tau. The rotation velocity is 0.8 km s −1 /sin i at the radius, which is roughly consistent with a Kepler rotation around the central star. The inclination angle of the disk, i, is estimated to be about 60°, and the gas kinetic temperature is estimated to be about 8 K at that radius