学术报告—Eruptive Young Stars in the Era of Large-Scale Surveys

Abstract:

The pre-main-sequence evolution is shaped by the mass accretion process, with eruptive behaviours in nature. The episodic accretion events have great impacts on the evolution of the young system, as most of the stellar mass is thought to be accreted during this stage. It also affects the formation of young planets by heating the protoplanetary disc. In this talk, I will present the latest search results of eruptive behaviours of protostars from the decade-long photometric surveys (VVV & NEOWISE). In particular, we confirmed 15 new FUor-type outbursts with data from the VVV survey and VLT/XSHOOTER spectrograph. We also discovered an eruptive T Tauri star with delays between the optical and infrared rising stages, suggesting the instability originated at 0.1 AU. I will also present some statistical results on protostellar eruptive behaviours.

Bio:

Dr. Zhen Guo is originally from Beijing, China. In 2018, he finished his PhD at the Kavli Institute for Astronomy and Astrophysics at Peking University, supervised by Prof. Greg Herczeg on the topic of variable young stellar objects. Later, he joined the VVV survey team at the University of Hertfordshire as a postdoc researcher. In 2022, he moved to Universidad de Valparaiso in Chile as an independent research fellow. Since 2024, he became an assistant professor in Valparaiso and a junior member of the Millennium Institute of Astrophysics.