Oral Presentation

The eDisk First-look Results of Ced110 IRS4: a Possible Substructure in an Embedded Disk

Author(s): Jinshi Sai (ASIAA), and the eDisk team

Presenter: Jinshi Sai (ASIAA)

High resolution observations with ALMA have over the last years shown that many protoplanetary disks around T Tauri stars (or Class II sources) exhibit substructures such as rings and gaps, possibly indicative of on-going planet formation. However, exactly when such substructures inside disks start to develop remains unclear. The Early Planet Formation in Embedded Disks (eDisk) survey aims to study 19 Class 0 and I protostars at high angular resolution (~0.08") with ALMA at ~1 mm wavelengths to understand when substructures start to form in disks around deeply embedded protostars. In this talk, we present the first results from the eDisk program for Ced110 IRS4, a Class 0 protostellar system in the Chameleon star forming region. The primary source and a companion with a separation of ~1.4'' (~260 au) is spatially resolved for the first time in these data. Dust continuum emission associated with the primary source, tracing the young dusty disk, shows bumpy structures at a radius of ~0.2'' (~40 au). The bump appears less sharp compared to the rings typically found in the disks around Class II sources. This may reflect optical depth effects at 1 mm or that substructures in disks in earlier evolutionary stages are intrinsically more shallow.