Dec 11 – 15, 2023
Tsung-Dao Lee Institute
Asia/Shanghai timezone

An Explanation for Overrepresentation of Tidal Disruption Events in Post-starburst Galaxies

Dec 15, 2023, 2:45 PM
Contributed talk in mini symposium Poster


mengye wang


Tidal disruption events (TDEs) provide a valuable probe in studying the dynamics of stars in the nuclear environments of galaxies. Recent observations show that TDEs are strongly overrepresented in post-starburst or "green valley" galaxies, although the underlying physical mechanism remains unclear. Considering the possible interaction between stars and active galactic nucleus (AGN) disk, the TDE rates can be greatly changed compared to those in quiescent galactic nuclei. We revisit TDE rates by incorporating an evolving AGN disk within the framework of the "loss cone" theory. We numerically evolve the Fokker-Planck equations by considering the star-disk interactions, in-situ star formation in the unstable region of the outer AGN disk and the1 evolution of accretion process for supermassive black holes (SMBHs). We find that the TDE rates are enhanced by about two orders of magnitude shortly after the AGN transitions into a non-active stage. During this phase, the accumulated stars are rapidly scattered into the loss cone due to the disappearance of the inner standard thin disk. Our results provide an explanation for the overrepresentation of TDEs in post-starburst galaxies.

Primary authors

Prof. Ning Jiang (CAS Key laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, 230026, 7 People’s Republic of China) Prof. Qingwen Wu (4 Department of Astronomy, School of physics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, China) mengye wang


Prof. Yiqiu Ma (Center for Gravitational Experiment, School of physics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, China)

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