Constant entropy hybrid stars: a first approximation of cooling evolution
| Autor: | Mauro Mariani, Milva Orsaria, Héctor Vucetich |
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| Rok vydání: | 2016 |
| Předmět: |
Equation of state
Strange quark Ciencias Astronómicas Ciencias Físicas Nuclear Theory FOS: Physical sciences Astrophysics 01 natural sciences purl.org/becyt/ford/1 [https] Gravitation NEUTRON [STARS] 0103 physical sciences DENSE MATTER 010303 astronomy & astrophysics Stellar evolution Solar and Stellar Astrophysics (astro-ph.SR) Physics High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics EQUATION OF STATE High Energy Physics::Phenomenology Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Stars: neutron Computational physics Astronomía Baryon Strange matter Neutron star Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics - High Energy Astrophysical Phenomena CIENCIAS NATURALES Y EXACTAS Dense matter |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| DOI: | 10.48550/arxiv.1607.05200 |
| Popis: | Aims. 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. Methods. 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. The phase transition was obtained imposing the Maxwell conditions, by assuming a high surface tension at the interface hadron-quark. We solved the relativistic structure equations of hydrostatic equilibrium and mass conservation for hybrid star configurations. Results. 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. Conclusions. 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 ≥2 M⊙ 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. Facultad de Ciencias Astronómicas y Geofísicas |
| Databáze: | OpenAIRE |
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