A ROTATING DISK IN THE HH 111 PROTOSTELLAR SYSTEM

The HH 111 protostellar system is a young Class I system with two sources, VLA 1 and VLA 2, at a distance of 400 pc. Previously, a flattened envelope has been seen in C(18)O to be in transition to a rotationally supported disk near the VLA 1 source. The follow-up study here is to confirm the rotationally supported disk at 2-3 times higher angular resolutions, at similar to 0.'' 3 (or 120 AU) in 1.33 mm continuum, and similar to 0.'' 6 (or 240 AU) in (13)CO (J = 2-1) and (12)CO (J = 2-1) emission obtained with the Submillimeter Array. The 1.33 mm continuum emission shows a resolved dusty disk associated with the VLA 1 source perpendicular to the jet axis, with a Gaussian deconvolved size of similar to 240 AU. The (13)CO and (12)CO emissions toward the dusty disk show a Keplerian rotation, indicating that the dusty disk is rotationally supported. The density and temperature distributions in the disk derived from a simple disk model are found to be similar to those found in bright T Tauri disks, suggesting that the disk can evolve into a T Tauri disk in the late stage of star formation. In addition, a hint of a low-velocity molecular outflow is also seen in (13)CO and (12)CO coming out from the disk.