报告摘要：It is well known that disks are formed around young stellar objectsduring the starformation process. Even though these disks are formed as by-productsof star formation, theyplay essential roles in star and planet formation. In particular,disks around Class II sources,often called protoplanetary disks, have attracted more attentionbecause they are believedin the main planet-formation phase. In contrast, disks around embeddedprotostars, whichare younger and more embedded than Class II disks, have attracted lessattention. Recentresearches, however, suggest importance of embedded disks for planetformation, requiring moresystematic study of embedded disks. We have therefore carried out theALMA large program“Embedded disks in early planet formation (eDisk)”, observing 19protostars in nearby starforming regions in 1.3 mm continuum at a resolution of 0.04” and inmolecular lines such asCO isotopologues at a resolution of 0.1”. In this presentation, I willreview observational resultsof the eDisk program, with emphasis on more recent demographic results.

主讲人简介：Nagayoshi Ohashi is a Research Fellow at the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA) in Taiwan. He obtained his Ph.D. in Astronomy from Nagoya University and subsequently worked as a postdoctoral fellow at the Harvard–Smithsonian Center for Astrophysics. His research focuses on star and planet formation, particularly on protostellar disks and molecular cloud dynamics, using submillimeter observations with ALMA and SMA. As Principal Investigator of the ALMA Large Program eDisk, he leads an international collaboration studying the earliest stages of planet formation.