Black Hole Supernovae, their Equation of State Dependence and Ejecta Composition

Abstract

Recent literature on core-collapse supernovae suggests that a black hole (BH) can form within $\sim 1$ s of shock revival, while still culminating in a successful supernova. We refer to these as black hole supernovae, as they are distinct from other BH formation channels in both timescale and impact on the explosion. We simulate these events self-consistently from core-collapse until $20\text{-}50$ days after collapse using three axisymmetric models of a $60$ M${}_{\odot }$ zero-age main sequence progenitor star and investigate how the composition of the ejecta is impacted by the BH formation. We employ Skyrme-type equations of state (EOSs) and vary the uncertain nucleonic effective mass, which affects the pressure inside the proto-neutron star through the thermal part of the EOS. This results in different BH formation times and explosion energies at BH formation, yielding final explosion energies between $0.06\text{-}0.72\times 10^{51}$ erg with $21.8\text{-}23.3$ M${}_{\odot }$ of ejecta, of which $0\text{-}0.018$ M${}_{\odot }$ is ${}^{56}$Ni. Compared to expectations from 1D simulations, we find a more nuanced EOS dependence of the explosion dynamics, the mass of the BH remnant, and the elemental composition of the ejecta. We investigate why the explosions survive despite the massive overburden and link the shape of the diagnostic energy curve and character of the ejecta evolution to the progenitor structure.

25 pages, 17 figures

References in corpus (17)

• Array Programming with NumPy
• Fallback and Black Hole Production in Massive Stars
• The Landscape of the Neutrino Mechanism of Core-Collapse Supernovae: Neutron Star and Black Hole Mass Functions, Explosion Energies and Nickel Yields
• Truncated Moment Formalism for Radiation Hydrodynamics in Numerical Relativity
• Hydrodynamics of core-collapse supernovae and their progenitors
• The Explosion of Helium Stars Evolved With Mass Loss
• SkyNet: A modular nuclear reaction network library
• The Dynamics of Neutrino-Driven Supernova Explosions after Shock Revival in 2D and 3D
• Three-dimensional Models of Core-collapse Supernovae From Low-mass Progenitors With Implications for Crab
• Black hole formation and fallback during the supernova explosion of a $40{\mathrm{M}}_{\odot }$ star
• Neutrino-nucleon scattering in supernova matter from the virial expansion
• PUSHing core-collapse supernovae to explosions in spherical symmetry IV: Explodability, remnant properties and nucleosynthesis yields of low metallicity stars
• The final core collapse of pulsational pair instability supernovae
• Pulsational pair-instability supernovae: gravitational collapse, black-hole formation, and beyond
• Mass ejection in failed supernovae: equation of state and neutrino loss dependence
• On the Neutron Star/Black Hole Mass Gap and Black Hole Searches
• Post-explosion evolution of core-collapse supernovae