Early Planet Formation in Embedded Disks (eDisk): Possible Substructure Formation in an Embedded Disk of the Ced110 IRS4 system

Jinshi Sai, Hsi-Wei Yen, Nagayoshi Ohashi, John J Tobin, Jes K Jorgensen, eDisk Team

Protoplanetary disks around T Tauri stars (or Class II sources) commonly exhibit substructures such as rings and gaps, possibly indicative of on-going planet formation. However, when such substructures inside disks begin 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 1.3 mm wavelengths to understand when substructures start to form in disks around deeply embedded protostars. In this poster, we will summarize the first results from the eDisk program for Ced110 IRS4, a Class 0/I protostellar system in the Chameleon star forming region. The primary source and a companion, Ced110 IRS4A and IRS4B, respectively, with a separation of ~1.3'' (~250 au) is spatially resolved. Dust continuum emission associated with Ced110 IRS4A, tracing the young dusty disk, shows shoulder-like structures at a radius of ~0.2'' (~40 au). The shoulders can be interpreted as a shallow, annular structure in the continuum emission, as demonstrated from our two-dimensional intensity distribution models. The annular structure may reflect a substructure in the surface density of the embedded disk, though the effect of the optical depth needs to be evaluated in more detail in a future work.

[Poster PDF File]