Optical Transients from the Unbound Debris of Tidal Disruption - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




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Abstract: In the tidal disruption of a star by a black hole, roughly half of thestellar mass becomes bound and falls into the black hole, while the other halfis ejected at high velocity. Several previous studies have considered theemission resulting from the accretion of bound material; we consider thepossibility that the unbound debris may also radiate once it has expanded andbecome transparent. We show that the gradual energy input from hydrogenrecombination compensates for adiabatic loses over significant expansionfactors. The opacity also drops dramatically with recombination, and theinternal energy can be radiated by means of a cooling-transparency wavepropagating from the surface layers inward. The result is a brief opticaltransient occurring ~1 week after disruption and lasting 3-5 days with peakluminosities of 10^40-10^42 ergs-s, depending on the mass of the disruptedstar. These recombination powered transients should accompany thex-ray-ultraviolet flare from the accretion of bound material, and so may be auseful signature for discriminating tidal disruption events, especially forlower and intermediate mass black holes.



Autor: Daniel Kasen, Enrico Ramirez-Ruiz

Fuente: https://arxiv.org/







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