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Wednesday 27 Jan 2016Seminar: ***11am*** Accretion Disk formation following tidal disruption of stars on bound orbits around spinning supermassive black holes

Prof Kimitake Hayasaki - Chungbuk National University, S Korea

Physics, 4th floor 11:00-12:00

Tidal disruption events (TDEs) provide evidence for dormant supermassive black holes (SMBHs) in the centers of inactive galaxies. TDEs occur when a star on a parabolic orbit approaches close enough to a SMBH to be disrupted by the tidal force of the SMBH. The subsequent super-Eddington accretion of stellar debris falling back to the SMBH produces a characteristic flare lasting several months. However, it remains a matter of debate how the returning material loses its own orbital energy and accretes onto the SMBH following disruption. In this talk, we study the circularization of debris from tidally disrupted stars on bound orbits around spinning SMBHs by performing three-dimensional Smoothed Particle Hydrodynamics simulations with Post-Newtonian corrections. We will discuss the following three main results:
1. The difference between standard, parabolic TDEs and eccentric TDEs.
2. The dependence of the debris circularization process on radiative cooling efficiency.
3. The role of Lense-Thirring precession during debris circularization.

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