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Title: CORE-COLLAPSE SUPERNOVA EQUATIONS OF STATE BASED ON NEUTRON STAR OBSERVATIONS

Many of the currently available equations of state for core-collapse supernova simulations give large neutron star radii and do not provide large enough neutron star masses, both of which are inconsistent with some recent neutron star observations. In addition, one of the critical uncertainties in the nucleon-nucleon interaction, the nuclear symmetry energy, is not fully explored by the currently available equations of state. In this article, we construct two new equations of state which match recent neutron star observations and provide more flexibility in studying the dependence on nuclear matter properties. The equations of state are also provided in tabular form, covering a wide range in density, temperature, and asymmetry, suitable for astrophysical simulations. These new equations of state are implemented into our spherically symmetric core-collapse supernova model, which is based on general relativistic radiation hydrodynamics with three-flavor Boltzmann neutrino transport. The results are compared with commonly used equations of state in supernova simulations of 11.2 and 40 M{sub Sun} progenitors. We consider only equations of state which are fitted to nuclear binding energies and other experimental and observational constraints. We find that central densities at bounce are weakly correlated with L and that there is a moderate influence ofmore » the symmetry energy on the evolution of the electron fraction. The new models also obey the previously observed correlation between the time to black hole formation and the maximum mass of an s = 4 neutron star.« less
Authors:
 [1] ;  [2] ;  [3]
  1. Institute for Nuclear Theory, University of Washington, Seattle, WA 98195 (United States)
  2. Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel (Switzerland)
  3. Institute for Theoretical Physics, University of Wroclaw, pl. Maxa Borna 9, 50-204, Wroclaw (Poland)
Publication Date:
OSTI Identifier:
22133990
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 774; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; BINDING ENERGY; BLACK HOLES; DENSITY; ELECTRONS; EQUATIONS OF STATE; FLAVOR MODEL; HYDRODYNAMIC MODEL; LIMITING VALUES; NEUTRINOS; NEUTRON STARS; NUCLEAR MATTER; NUCLEON-NUCLEON INTERACTIONS; RELATIVISTIC RANGE; SPHERICAL CONFIGURATION; SUPERNOVAE; TEMPERATURE DEPENDENCE; TRANSPORT THEORY