Early Planet Formation in Embedded Disks (eDisk)
Alejandro Santamaría-Miranda, I. de Gregorio‐Monsalvo, Nagayoshi Ohashi, John Tobin, Jinshi Sai, J. K. Jørgensen, Yusuke Aso, Zhe-Yu Daniel Lin, Christian Flores, Miyu Kido, Patrick M. Koch, Woojin Kwon, Chang Won Lee, Zhi‐Yun Li, Leslie W. Looney, Adele Plunkett, Shigehisa Takakuwa, Merel L. R. van ’t Hoff, Jonathan P. Williams, Hsi-Wei Yen
Abstract
We present the results of the observations made within the ALMA Large Program called Early Planet Formation in Embedded disks of the Class 0 protostar GSS30 IRS3. Our observations included the 1.3 mm continuum with a resolution of 0″.05 (7.8 au) and several molecular species, including 12 CO, 13 CO, C 18 O, H 2 CO, and c-C 3 H 2 . The dust continuum analysis unveiled a disk-shaped structure with a major axis of ~200 au. We observed an asymmetry in the minor axis of the continuum emission suggesting that the emission is optically thick and the disk is flared. On the other hand, we identified two prominent bumps along the major axis located at distances of 26 and 50 au from the central protostar. The origin of the bumps remains uncertain and might be an embedded substructure within the disk or the temperature distribution and not the surface density because the continuum emission is optically thick. The 12 CO emission reveals a molecular outflow consisting of three distinct components: a collimated component, an intermediate-velocity component exhibiting an hourglass shape, and a wider angle low-velocity component. We associate these components with the coexistence of a jet and a disk wind. The C 18 O emission traces both a circumstellar disk in Keplerian rotation and the infall of the rotating envelope. We measured a stellar dynamical mass of 0.35 ±0.09 M ⊙ .