Speaker
Description
In tidal disruption events the stellar disrupted by massive black hole results in
an elongated stream of gas that partly falls back to pericenter. If the black hole
rotates around an axis misaligned with the initial stellar orbit, the first stream
crossing may occur at periapse if the returing stream fail to collide itself near
apocenter due to Lense-Thirring effect. In our work we study the stream
crossing near pericenter by performing local hydrodynamical simulations
using Athena++ code. From simulations, when the streams collide a strong
radiation-pressure dominated shock forms and converts the stream’s kinetic
energy into thermal energy. We note that the amount of energy dissipation
(converting to thermal energy) measured from simulation is equal to analytical
results. At the same time, the strong downstream gas pressure accelerates
the gas and causes it to expand. We show the increase of width of
downstream gas with distance to BH, which likely leads to collisions in
subsequent orbits and accelerating formation of an accretion disc.
