邀请人 (Invited by): 余聪

时间 (Time):星期三，2023/12/20-10:00-11:00

地点 (Location): 珠海校区瀚林3号B431会议室

摘要 (Abstract): 

A significant fraction of super-Earths and sub-Neptunes are thought to experience an extreme loss of volatiles because of atmospheric evaporation in the early stages of their life. Though the mechanisms behind the extreme mass loss are not fully understood, two contenders have been widely discussed: photoevaporation from X-ray and ultraviolet irradiation and core powered mass loss. In this talk, I will discuss the new model of Modirrousta-Galian & Korenaga (2023), suggesting that both mechanisms occur but with different timescales and that atmospheric evaporation can be classified under three regimes. This talk will summarize by explaining why the next step in exoplanetary science is to incorporate more realistic formational and geophysical modeling, and how such models could be tested through observations.

主讲人简介 (Speaker's CV): 

Darius Modirrousta-Galian is a postdoctoral associate at Yale University, before which he obtained his PhD from the University of Palermo in 2022. His research interests include super-Earths, sub-Neptunes, X-ray and ultraviolet-induced atmospheric evaporation, atmospheric modeling, interior modeling, and large population simulations.