Effects of Symmetry Energy on the Equation of State for Simulations of Core-collapse Supernovae and Neutron-star Mergers

We construct a new equation of state (EOS) for numerical simulations of core-collapse supernovae and neutron-star mergers based on an extended relativistic mean-field model with a small symmetry energy slope L, which is compatible with both experimental nuclear data and recent observations of neutro...

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Bibliographic Details
Published in:The Astrophysical journal 2020-03, Vol.891 (2), p.148
Main Authors: Shen, Hong, Ji, Fan, Hu, Jinniu, Sumiyoshi, Kohsuke
Format: Article
Language:English
Subjects:
Astrophysics
Compact objects
Computer simulation
Core-collapse supernovae
Density dependence
Equations of state
Formability
Mathematical models
Neutron stars
Neutrons
Numerical simulations
Phase diagrams
Simulation
Star mergers
Stars & galaxies
Supernovae
Symmetry
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Summary:We construct a new equation of state (EOS) for numerical simulations of core-collapse supernovae and neutron-star mergers based on an extended relativistic mean-field model with a small symmetry energy slope L, which is compatible with both experimental nuclear data and recent observations of neutron stars. The new EOS table (EOS4) based on the extended TM1 (TM1e) model with L = 40 MeV is designed in the same tabular form and compared with the commonly used Shen EOS (EOS2) based on the original TM1 model with . This is convenient and useful for performing numerical simulations and examining the influences of symmetry energy and its density dependence on astrophysical phenomena. In comparison with the TM1 model used in EOS2, the TM1e model provides a similar maximum neutron-star mass but smaller radius and tidal deformability for a 1.4M neutron star, which is more consistent with current constraints. By comparing the phase diagram and thermodynamic quantities between EOS4 and EOS2, it is found that the TM1e model predicts a relatively larger region of nonuniform matter and softer EOS for neutron-rich matter. Significant differences between EOS4 and EOS2 are observed in the case with low proton fraction, while the properties of symmetric matter remain unchanged.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab72fd