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Finite-temperature equations of state of compact stars with hyperons: three-dimensional tables

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arxiv 2406.00484 v2 pith:EW4P5DPE submitted 2024-06-01 nucl-th astro-ph.HEastro-ph.SR

classification nucl-thastro-ph.HEastro-ph.SR
keywords matterdensitystarstablestemperatureastrophysicalcompactconstraints
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abstract

We construct tables of finite temperature equation of state (EoS) of hypernuclear matter in the range of densities, temperatures, and electron fractions that are needed for numerical simulations of supernovas, proto-neutron stars, and binary neutron star mergers and cast them in the format of {\sc CompOSE} database. The tables are extracted from a model that is based on covariant density functional (CDF) theory that includes the full $J^P=1/2^+$ baryon octet in a manner that is consistent with the current astrophysical and nuclear constraints. We employ a parameterization with three different values of the slope of the symmetry energy $L_{\rm sym}=30$, 50 and 70 MeV and fixed skewness $Q_{\rm sat}= 400$ MeV for above saturation matter. A model for the EoS of inhomogeneous matter is matched at sub-saturation density to the high-density hypernuclear EoS. We discuss the generic features of the resulting EoS and the composition of matter as a function of density, temperature, and electron fraction. The nuclear characteristics and strangeness fraction of these models are compared to the alternatives from the literature. The integral properties of static and rapidly rotating compact stars in the limit of zero temperature are discussed and confronted with the multimessenger astrophysical constraints.

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  1. $f$-mode oscillations in hot Neutron Stars: Effect of hyperons and neutrino trapping

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    For hot hyperonic neutron stars with trapped neutrinos, the nuclear saturation density becomes the dominant parameter controlling radii, tidal deformability, and f-mode frequencies, and the standard cold universal rel...

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