Cooling of hypernuclear compact stars: Hartree-Fock models and high-density pairing

Abstract

The thermal evolution of hypernuclear compact stars is studied for stellar models constructed on the basis of covariant density functional theory in Hartree and Hartree-Fock approximation. Parametrizations of both types are consistent with the astrophysical mass constraints on compact stars and available hypernuclear data. We discuss the differences of these density functionals and highlight the effects they have on the composition and on the cooling of hypernuclear stars. It is shown that hypernuclear stars computed with density functional models that have a low symmetry energy slope, $L$, are fairly consistent with the cooling data of observed compact stars. The class of stellar models based on larger $L$ values gives rise to the direct Urca process at low densities, which leads to significantly faster cooling. We conjecture high-density pairing for protons and $\Lambda$'s in the $P$-wave channel and provide simple scaling arguments to obtain these gaps. As a consequence the most massive stellar models with masses $1.8\le M/M_{\odot }\le 2$ experience slower cooling by hyperonic dUrca processes which involve $\Lambda$'s and protons.

15 pages, 8 figures

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Cited by in corpus (15)

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• Heavy Baryons in Compact Stars
• Thermal evolution of relativistic hyperonic compact stars with calibrated equations of state
• Anisotropic compact stars in higher-order curvature theory
• Thermal behavior as indicator for hyperons in binary neutron star merger remnants
• Fast cooling and internal heating in hyperon stars
• Thermal luminosity degeneracy of magnetized neutron stars with and without hyperon cores
• Impact of Multiple Phase Transitions in Dense QCD on Compact Stars
• Superconductivity in magnetars: Exploring type-I and type-II states in toroidal magnetic fields
• Axion sourcing in dense stellar matter via CP-violating couplings
• A direct probe of $\Lambda$ potential in nuclear medium
• Delayed Thermal Relaxation of Rapidly Cooling Neutron Stars: Nucleon Superfluidity and Non-nucleon Particles
• Probing $\Lambda$ potential via its $v_2$ flow in hypernuclei-induced reaction
• Topology of the Superconducting Heart of Neutron Stars: Effects of Microphysics and Gravitational-Wave Signatures
• Inferring the nuclear symmetry energy at supra saturation density from neutrino cooling