Implications of Hyperon Pairing for Cooling of Neutron Stars

Abstract

The implications of hyperon pairing for the thermal evolution of neutron stars containing hyperons are investigated. The outcome of cooling simulations are compared for neutron star models composed only of nucleons and leptons, models including hyperons, and models including pairing of hyperons. We show that lambda and neutron pairing suppresses all possible fast neutrino emission processes in not too massive neutron stars. The inclusion of lambda pairing yields better agreement with X-ray observations of pulsars. Particularly, the surface temperatures deduced from X-ray observations within the hydrogen atmosphere model are more consistent with the thermal history of neutron stars containing hyperons, if the critical temperature for the onset of lambda and nucleon pairing is not too small.

7 pages, 3 figures. To be published in ApJL. The postscript and additional tables can be found at http://www.physik.uni-muenchen.de/sektion/suessmann/astro/cool/schaab.0897

References in corpus (2)

• An Effective Equation of State for Dense Matter with Strangeness
• S-wave Pairing of $\Lambda$ Hyperons in Dense Matter

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• Vector current conservation and neutrino emission from singlet-paired baryons in neutron stars
• Roles of Hyperons in Neutron Stars
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• Strangeness in Compact Stars
• Hypernuclear stars from relativistic Hartree-Fock density functional theory
• Superfluidity of $\Lambda$ hyperons in neutron stars
• Thermal evolution of relativistic hyperonic compact stars with calibrated equations of state
• Superfluidity of ${\Sigma }^{-}$ hyperons in $\beta$-stable neutron star matter
• Cooling of hypernuclear compact stars: Hartree-Fock models and high-density pairing
• Effective interactions of hyperons and mass-radius relation of neutron stars
• The impact of asymmetric dark matter on the thermal evolution of nucleonic and hyperonic compact stars
• Possibility of ΛΛpairing and its dependence on background density in relativistic Hartree-Bogoliubov model
• The Properties of Matter in White Dwarfs and Neutron Stars
• Neutron superfluidity in strongly magnetic interiors of neutron stars and its effect on thermal evolution
• Neutrino emission from Cooper pairs at finite temperatures
• Neutron Stars with a Stable, Light Supersymmetric Baryon
• Effects of Finite Temperature and Pairing Correlations in Multi-$\Lambda$ Hypernuclei
• The effects of delta mesons on the baryonic direct Urca processes in neutron star matter
• Two Dimensional Cooling Simulations of Rotating Neutron Stars