Shock breakout from Tidal Disruption events

Stars in galactic nuclei orbit a supermassive black hole When one of these stars gets too close to the central black hole it is torn apart by the tidal forces The subsequent demise of the star produces a brilliant transient which produces photons in a wide range of energies from X rays to radio This emission however typically occurs months after closest approach In this talk I will discuss a possible precursor to a tidal disruption event a short faint and hard emission at maximum compression akin to supernova shock breakout I will discuss the lightcurve and spectrum of this precursor the relation between the types of galactic centres and the event rate and the expected detection rate current and next generation telescopes