Modeling the Optical Emission of Tidal Disruption Events

In this talk, i will present some new advances in the theory of Tidal Disruption Events (TDE). TDEs occur when a star approaches a SMBH close enough to be torn apart by the black hole tidal field. The rapid accretion of the stellar debris produce a luminous, possibly super-Eddington flare, lighting up an otherwise quiescent black hole. In this talk, I will present some recent results concerning the formation and early evolution of an accretion disc formed by the stellar debris. The structure of the disc is strongly dependent on the thermal state of the gas, with efficient or inefficient cooling giving rise to either a thin disc or an extended torus/envelope surrounding the black hole. I will present the results of numerical simulations confirming this picture and including relativistic effects, which are essential for the formation of the disc. Finally, I will discuss the possible development of quasi periodic signals arising from Lense-Thirring precession around a spinning black hole. 

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