Stellar Mass Black Hole Formation and Multimessenger Signals from Threedimensional Rotating Corecollapse Supernova Simulations
Abstract
We present selfconsistent 3D corecollapse supernova simulations of a 40 ${M}_{\odot }$ progenitor model using the isotropic diffusion source approximation for neutrino transport and an effective general relativistic potential up to ~0.9 s postbounce. We consider three different rotational speeds with initial angular velocities of ${{\rm{\Omega }}}_{0}=0$ , 0.5, and 1 rad s^{1} and investigate the impact of rotation on shock dynamics, black hole (BH) formation, and gravitational wave (GW) signals. The rapidly rotating model undergoes an early explosion at ~250 ms postbounce and shows signs of the low $T/ W $ instability. We do not find BH formation in this model within ~460 ms postbounce. In contrast, we find BH formation at 776 ms postbounce and 936 ms postbounce for the nonrotating and slowly rotating models, respectively. The slowly rotating model explodes at ~650 ms postbounce, and the subsequent fallback accretion onto the protoneutron star (PNS) results in BH formation. In addition, the standing accretion shock instability induces rotation of the PNS in the model that started with a nonrotating progenitor. Assuming conservation of specific angular momentum during BH formation, this corresponds to a BH spin parameter of a = J/M = 0.046. However, if no explosion sets in, all the angular momentum will eventually be accreted by the BH, resulting in a nonspinning BH. The successful explosion of the slowly rotating model drastically slows down the accretion onto the PNS, allowing continued cooling and contraction that results in an extremely high GW frequency (f ~ 3000 Hz) at BH formation, while the nonrotating model generates GW signals similar to our corresponding 2D simulations.
 Publication:

The Astrophysical Journal
 Pub Date:
 June 2021
 DOI:
 10.3847/15384357/abfb05
 arXiv:
 arXiv:2010.02453
 Bibcode:
 2021ApJ...914..140P
 Keywords:

 Corecollapse supernovae;
 Black holes;
 Neutron stars;
 Gravitational wave astronomy;
 Hydrodynamical simulations;
 304;
 162;
 1108;
 675;
 767;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 17 pages, 11 figures. Accepted for publication in ApJ