Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results

Abstract We present an overview of the Large Program, “Early Planet Formation in Embedded Disks (eDisk),” conducted with Atacama Millimeter/submillimeter Array (ALMA). The ubiquitous detections substructures, particularly rings and gaps, protoplanetary disks around T Tauri stars raise possibility that at least some planet formation may have already started during embedded stages star formation. In order to address exactly how when is initiated, program focuses on searching for substructures 12 Class 0 7 I protostars nearby (<200 pc) star-forming regions through 1.3 mm continuum observations a resolution ∼7 au (0.″04). initial results show emission, mostly arising from dust sample protostars, has relatively few distinctive such as spirals, marked contrast II disks. dramatic difference suggest quickly develop systems evolve sources, or alternatively high optical depth emission could obscure internal structures. Kinematic information obtained CO isotopologue lines other reveals presence Keplerian providing us crucial physical parameters, particular, dynamical mass central protostars. describe background eDisk program, selection their ALMA observations, data reduction, we also highlight representative first-look results.