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Equation of state for hot hyperonic neutron star matter
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abstract
The FSU2H equation-of-state model, originally developed to describe cold neutron star matter with hyperonic cores, is extended to finite temperature. Results are presented for a wide range of temperatures and lepton fractions, which cover the conditions met in protoneutron star matter, neutron star mergers and supernova explosions. It is found that the temperature effects on the thermodynamical observables and the composition of the neutron star core are stronger when the hyperonic degrees of freedom are considered. An evaluation of the temperature and density dependence of the thermal index leads to the observation that the so-called $\Gamma$ law, widely used in neutron star merger simulations, is not appropriate to reproduce the true thermal effects, specially when hyperons start to be abundant in the neutron star core. To make finite temperature equations of state easily accessible, simple parameterizations of the thermal index for nucleonic and hyperonic $\beta$-stable neutrino-free matter are provided.
Forward citations
Cited by 2 Pith papers
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Constraints on maximum neutron star mass from proto-neutron star evolution
Hyperonic neutron stars are inferred to cap at roughly 2.15 to 2.2 solar masses, while stars above 2.2 solar masses should have purely nucleonic cores.
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Hyperonic degrees of freedom in binary neutron star mergers
A review of neutron star merger simulations showing that hyperonic equations of state yield distinctive gravitational wave, temperature, ejecta, and collapse-threshold signatures.
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