Tidal disruption discs formed and fed by stream–stream and stream–disc interactions in global GRHD simulations

ABSTRACT When a star passes close to supermassive black hole (BH), the BH’s tidal forces rip it apart into thin stream, leading disruption event (TDE). In this work, we study post-disruption phase of TDEs in general relativistic hydrodynamics (GRHD) using our GPU-accelerated code h-amr. We carry out first grid-based simulation deep-penetration TDE (? = 7) with realistic system parameters: hole-to-star mass ratio 106, parabolic stellar trajectory, and non-zero BH spin. also tilted whose orbit is inclined relative midplane. show that for aligned TDE, an accretion disc forms due dissipation orbital energy ?20 per cent infalling material reaching BH. The initially dominated by violent self-intersections later stream–disc interactions near pericentre. completely disrupt incoming resulting five distinct self-intersection events separated approximately 12 h flaring rate. find eccentric mean eccentricity e ? 0.88. For only partial nodal precession Although these intersections eject gas plane, still similar accreted fraction case. These results have important implications formation disruptions. instance, periodicity rate induced complete stream may explain from Swift J1644+57.