Early Planet Formation in Embedded Disks (eDisk): A Compact but Structured Keplerian Disk and Large-scale Spiral Structures Revealed in the Class I Protostellar System IRAS 04169+2702

Ilseung Han, Woojin Kwon, Nagayoshi Ohashi, John J. Tobin, Jes K. Jorgensen, the eDisk team

We present the first-look results of high-resolution (up to 0.05") dust continuum and molecular line observations toward the Class I protostellar system IRAS 04169+2702 in the Taurus B213 region (d = 156 pc), as part of the ALMA Cycle 7 Large Program Early Planet Formation in Embedded Disks (eDisk). The 1.3-mm dust continuum emission reveals two local peaks at the central region surrounding a free-free emission dominant hole. Velocity gradients along the disk major axis, which is perpendicular to the bipolar outflow, are seen in the C18O, 13CO, and 12CO emissions. The position-velocity diagrams of these line emissions demonstrate a Keplerian-rotating disk around 1 solar-mass protostar and an infalling envelope in conservation of angular momentum. In addition to the compact disk, a spiral structure is revealed in the dust continuum, C18O, 13CO, SO, and H2CO. Notably, in the region closer to the protostar, the spatial distribution of C18O coincides with that of SO, implying that shock occurs due to accretion through the spirals.

[Poster PDF File]