Constant entropy hybrid stars: a first approximation of cooling evolution

Abstract

We aim to study the possibility of a hadron-quark phase transition in the interior of neutron stars, taking into account different schematic evolutionary stages at finite temperature. We also discuss the strange quark matter stability in the quark matter phase. Furthermore, we aim to analyze the astrophysical properties of hot and cold hybrid stars, considering the constraint on maximum mass given by the pulsars J1614-2230 and J0348+0432. We have developed a computational code to construct semi-analytical hybrid equations of state at fixed entropy per baryon and to obtain different families of hybrid stars. An analytical approximation of the Field Correlator Method is developed for the quark matter equation of state. For the hadronic equation of state we use a table based on the relativistic mean field theory, without hyperons. We solved the relativistic structure equations of hydrostatic equilibrium and mass conservation for hybrid star configurations. For the different equations of state obtained, we calculated the stability window for the strange quark matter, lepton abundances, temperature profiles and contours profiles for the maximum mass star depending on the parameters of the Field Correlator Method. We also computed the mass-radius and gravitational mass-baryonic mass relationships for different hybrid star families. We have analyzed different stages of hot hybrid stars as a first approximation of the cooling evolution of neutron stars with quark matter cores. We obtain cold hybrid stars with maximum masses $\ge 2M_{\odot }$ for different combinations of the Field Correlator Method parameters. In addition, our study based on the gravitational mass - baryonic mass plane shows a late phase transition between hadronic and quark matter during the proto-hybrid star evolution, in contrast with previous studies of proto-neutron stars.

12 pages, 14 figures, published in A&A 601, A21 (2017)

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Cited by in corpus (21)

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• Magnetised hybrid stars: effects of slow and rapid phase transitions at the quark-hadron interface
• Hybrid stars in light of the HESS J1731-347 remnant and the PREX-II experiment
• Hyperons and quarks in proto-neutron stars
• XTE J1814-338: A potential hybrid star candidate
• Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model
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• Hybrid stars with color superconducting cores in an extended FCM model
• Quark cores in extensions of the MIT Bag model
• Towards a unified hadron-quark equation of state for neutron stars within the relativistic mean-field model
• On the Cooling of Compact Stars in Light of the HESS J1731-347 Remnant
• How Neutron Star Observations Point Towards Exotic Matter: Existing Explanations and a Prospective Proposal
• Thermodynamic potential for quark-gluon plasma with finite quark masses and chemical potential
• Isentropic hybrid stars in the Nambu-Jona-Lasinio model: effects of neutrino trapping