TY - JOUR
T1 - THE DEVELOPMENT of EXPLOSIONS in AXISYMMETRIC AB INITIO CORE-COLLAPSE SUPERNOVA SIMULATIONS of 12-25 M⊙ STARS
AU - Bruenn, Stephen W.
AU - Lentz, Eric J.
AU - Hix, W. Raphael
AU - Mezzacappa, Anthony
AU - Harris, J. Austin
AU - Messer, O. E.Bronson
AU - Endeve, Eirik
AU - Blondin, John M.
AU - Chertkow, Merek Austin
AU - Lingerfelt, Eric J.
AU - Marronetti, Pedro
AU - Yakunin, Konstantin N.
PY - 2016/2/20
Y1 - 2016/2/20
N2 - We present four ab initio axisymmetric core-collapse supernova simulations initiated from 12, 15, 20, and 25 M⊙ zero-age main sequence progenitors. All of the simulations yield explosions and have-been evolved for at least 1.2 s after core bounce and 1 s after material first becomes unbound. These simulations were computed with our CHIMERA code employing RbR spectral neutrino transport, special and general relativistic transport effects, and state-of-the-art neutrino interactions. Continuing the evolution beyond 1 s after core bounce allows the explosions to develop more fully and the processes involved in powering the explosions to become more clearly evident. We compute explosion energy estimates, including the negative gravitational binding energy of the stellar envelope outside the expanding shock, of 0.34, 0.88, 0.38, and 0.70 Bethe (B ≡ 1051 erg) and increasing at 0.03, 0.15, 0.19, and 0.52 Bs-1, respectively, for the 12, 15, 20, and 25 M⊙ models at the endpoint of this report. We examine the growth of the explosion energy in our models through detailed analyses of the energy sources and flows. We discuss how the explosion energies may be subject to stochastic variations as exemplfied by the effect of the explosion geometry of the 20 M⊙ model in reducing its explosion energy. We compute the proto-neutron star masses and kick velocities. We compare our results for the explosion energies and ejected 56Ni masses against some observational standards despite the large error bars in both models and observations.
AB - We present four ab initio axisymmetric core-collapse supernova simulations initiated from 12, 15, 20, and 25 M⊙ zero-age main sequence progenitors. All of the simulations yield explosions and have-been evolved for at least 1.2 s after core bounce and 1 s after material first becomes unbound. These simulations were computed with our CHIMERA code employing RbR spectral neutrino transport, special and general relativistic transport effects, and state-of-the-art neutrino interactions. Continuing the evolution beyond 1 s after core bounce allows the explosions to develop more fully and the processes involved in powering the explosions to become more clearly evident. We compute explosion energy estimates, including the negative gravitational binding energy of the stellar envelope outside the expanding shock, of 0.34, 0.88, 0.38, and 0.70 Bethe (B ≡ 1051 erg) and increasing at 0.03, 0.15, 0.19, and 0.52 Bs-1, respectively, for the 12, 15, 20, and 25 M⊙ models at the endpoint of this report. We examine the growth of the explosion energy in our models through detailed analyses of the energy sources and flows. We discuss how the explosion energies may be subject to stochastic variations as exemplfied by the effect of the explosion geometry of the 20 M⊙ model in reducing its explosion energy. We compute the proto-neutron star masses and kick velocities. We compare our results for the explosion energies and ejected 56Ni masses against some observational standards despite the large error bars in both models and observations.
KW - abundances
KW - neutrinos
KW - nuclear reactions
KW - nucleosynthesis
KW - stars: evolution
KW - stars: massive
KW - supernovae: general
UR - http://www.scopus.com/inward/record.url?scp=84960193243&partnerID=8YFLogxK
U2 - 10.3847/0004-637X/818/2/123
DO - 10.3847/0004-637X/818/2/123
M3 - Article
AN - SCOPUS:84960193243
SN - 0004-637X
VL - 818
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 123
ER -