Invited Presentation

Early Planet Formation in Embedded Disks (eDisk): Latest status of the project and first-look results

Author(s): Nagayoshi Ohashi and the eDisk collaboration

Presenter: Nagayoshi Ohashi (ASIAA)

Exoplanets are now ubiquitous, and a question of when and how these exoplanets are formed becomes one of hot topics in the modern astrophysics. Planets are considered to be formed in circumstellar disks, often called "protoplanetary disks'' around new-born stars. Recent high angular resolution and high sensitivity observations have allowed us to witness signs of planet formation in protoplanetary disks around optically visible pre-main-sequence (PMS) stars, which are not embedded in their parental dense molecular clouds any more. This raises an obvious question whether planet formation might begin even when star-disk systems are still embedded in their parental dense molecular clouds. This question is important for us to correctly understand the initial condition of planet formation.

In order to explore this question, we have started an ALMA large program “Early Planet Formation in Embedded Disks (eDisk)” (PI: N. Ohashi). Our sample sources are 19 embedded young stellar objects (YSOs) in nearby (D< 200 pc) star forming regions, of which 16 sources have been newly observed in 1.3 mm continuum emission and various molecular lines, including C18O (2-1), at angular resolutions of ~0.04" corresponding to ~5 au. Although the program was approved in 2019, the observations have started only recently because of the pandemic. The observations are still on-going as of June 2022, while most of data sets have been delivered. In my presentation, I will make a progress report of the program, including the first-look results.