Oral Presentation

Early Planet Formation in Embedded Disks (eDisk): Disk and streamer in IRAS16253-2429

Author(s): Yusuke Aso and the eDisk team

Presenter: Yusuke Aso (KASI)

Recent observations have pointed out that the typical Class II disks are not massive enough to form giant planets, implying the planet formation in the protostellar phase. The ALMA large program eDisk covers 19 protostars (16 objects are newly observed in Band 6) in order to detect a sign of planet formation in the protostellar stage. I will present the initial results of the Class 0 protostar IRAS 16253-2429. Whereas this protostar is a proto-brown dwarf candidate, the Keplerian rotation within a disk has not been identified yet. The 1.3 mm continuum emission at an angular resolution of 0.08" (11~au) shows a disk-like structure with a radius of ~20 au and a possible substructure. The C18O and 13CO J=2-1 emissions trace the infalling envelope, previously reported. While most of the 12CO J=2-1 emission traces the outflow perpendicular to the dusty disk, a high-velocity component (|V-Vsys|=1.5-5.5 km/s) suggests the presence of a Keplerian disk. The SO J_N=6_5 - 5_4 emission shows different velocity structures from the CO isotopologues, such as a streamer from the east.