Cooling of hypernuclear compact stars

Abstract

We study the thermal evolution of hypernuclear compact stars constructed from covariant density functional theory of hypernuclear matter and parameterizations which produce sequences of stars containing two-solar-mass objects. For the input in the simulations, we solve the Bardeen-Cooper-Schrieffer gap equations in the hyperonic sector and obtain the gaps in the spectra of $\Lambda$, ${\Xi }^0$ and ${\Xi }^{-}$ hyperons. For the models with masses $M/M_{\odot }\ge 1.5$ the neutrino cooling is dominated by hyperonic direct Urca processes in general. In the low-mass stars the $(\Lambda p)$ plus leptons channel is the dominant direct Urca process, whereas for more massive stars the purely hyperonic channels $({\Sigma }^{-}\Lambda )$ and $({\Xi }^{-}\Lambda )$ are dominant. Hyperonic pairing strongly suppresses the processes on ${\Xi }^{-}$s and to a lesser degree on $\Lambda$s. We find that intermediate-mass $1.5\le M/M_{\odot }\le 1.8$ models have surface temperatures which lie within the range inferred from thermally emitting neutron stars, if the hyperonic pairing is taken into account. Most massive models with $M/M_{\odot }\simeq 2$ may cool very fast via the direct Urca process through the $(\Lambda p)$ channel because they develop inner cores where the $S$-wave pairing of $\Lambda$s and proton is absent.

v2: minor changes, matches published version, 11 pages, 9 figures

References in corpus (16)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Constraints on the Symmetry Energy Using the Mass-Radius Relation of Neutron Stars
• Pulsars as Astrophysical Laboratories for Nuclear and Particle Physics
• Equation of State for Nucleonic and Hyperonic Neutron Stars with Mass and Radius Constraints
• A new temperature dependent hyperonic equation of state: application to rotating neutron star models and I-Q-relations
• Constraining hypernuclear density functional with $\Lambda$-hypernuclei and compact stars
• Neutrino emission due to Cooper-pair recombination in neutron stars revisited
• Statistical theory of thermal evolution of neutron stars
• A Massive Millisecond Pulsar in an Eccentric Binary
• Many-body forces in the equation of state of hyperonic matter
• Vertex renormalization in weak decays of Cooper pairs and cooling compact stars
• Superfluid Response and the Neutrino Emissivity of Neutron Matter
• BCS-BEC crossovers and unconventional phases in dilute nuclear matter
• Maximal isospin few-body systems of nucleons and $\Xi$ hyperons
• Theory of neutrino emission from nucleon-hyperon matter in neutron stars: Angular integrals

Cited by in corpus (49)

• Superfluidity in nuclear systems and neutron stars
• Competition between delta isobars and hyperons and properties of compact stars
• Heavy Baryons in Compact Stars
• Proto-neutron stars with heavy baryons and universal relations
• Confronting GW190814 with hyperonization in dense matter and hypernuclear compact stars
• Axion cooling of neutron stars. II. Beyond hadronic axions
• Hyperonic stars and the symmetry energy
• Cooling of Small and Massive Hyperonic Stars
• Hyperons in hot dense matter: what do the constraints tell us for equation of state?
• Hypernuclear stars from relativistic Hartree-Fock density functional theory
• Constraining compact star properties with nuclear saturation parameters
• Thermal evolution of relativistic hyperonic compact stars with calibrated equations of state
• Neutron star matter with strange interactions in a relativistic quark model
• Bulk viscosity in neutron stars with hyperon cores
• Limiting magnetic field for minimal deformation of a magnetised neutron star
• Cooling of hypernuclear compact stars: Hartree-Fock models and high-density pairing
• Chiral symmetry restoration and the $\Delta$ matter formation in neutron stars
• Thermal behavior as indicator for hyperons in binary neutron star merger remnants
• Hybrid stars are compatible with recent astrophysical observations
• Cooling of neutron stars in "nuclear medium cooling scenario" with stiff equation of state including hyperons
• Simultaneous Fitting of Neutron Star Structure and Cooling Data
• Gravitational wave asteroseismology on cooling neutron stars
• The impact of asymmetric dark matter on the thermal evolution of nucleonic and hyperonic compact stars
• Fast cooling and internal heating in hyperon stars
• $\Lambda \Lambda$ pairing in multi-strange hypernuclei
• Universal relations for compact stars with exotic degrees of freedom
• Massive relativistic compact stars from SU(3) symmetric quark models
• New equation of state involving Bose-Einstein condensate of antikaon for supernova and neutron star merger simulations
• Baryonic dense matter in view of gravitational-wave observations
• XMM-Newton observations of a gamma-ray pulsar J0633+0632: pulsations, cooling and large-scale emission
• Polytropic fits of modern and unified equations of state
• Standard cooling of rapidly rotating isolated neutron stars in 2D
• Influence of the nuclear symmetry energy slope on observables of compact stars with $\Delta$-admixed hypernuclear matter
• Thermal luminosity degeneracy of magnetized neutron stars with and without hyperon cores
• Hyperonic uncertainties in neutron stars, mergers and supernovae
• Ambipolar Heating of Magnetars
• Impact of Multiple Phase Transitions in Dense QCD on Compact Stars
• Hyperonization in compact stars
• Critical properties of calibrated relativistic mean-field models for the transition to warm, non-homogeneous nuclear matter
• A direct probe of $\Lambda$ potential in nuclear medium
• Axion sourcing in dense stellar matter via CP-violating couplings
• Strongly interacting matter in extreme magnetic fields
• 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
• New solution to the hyperon puzzle of neutron stars: Quantum many-body effects
• Instability windows of relativistic r-modes in stably stratified neutron stars with hyperonic cores
• On the desert between neutron star and black hole remnants
• Investigating Universal Relations in Compact Stars featuring $\Delta -$Admixed Exotic Dense Matter
• Inferring the nuclear symmetry energy at supra saturation density from neutrino cooling