Minimal models of cooling neutron stars with accreted envelopes

Details Minimal models of cooling neutron stars with accreted envelopes Minimal models of cooling neutron stars with accreted envelopes

2005-11-07

arxiv.org/abs/astro-ph/0511179v1

Mon.Not.Roy.Astron.Soc.365:1300-1308,2006

Astronomy and Astrophysics

Astrophysics

19 pages, 4 figures; accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09812.x

We study the "minimal" cooling scenario of superfluid neutron stars with nucleon cores, where the direct Urca process is forbidden and the enhanced cooling is produced by the neutrino emission due to Cooper pairing of neutrons. Extending our previous consideration (Gusakov et al. 2004a), we include the effects of accreted envelopes of light elements. We employ phenomenological density-dependent critical temperatures T_{cp}(\rho) and T_{cnt}(\rho) of singlet-state proton and triplet-state neutron pairing in a stellar core, as well as the critical temperature T_{cns}(\rho) of singlet-state neutron pairing in a stellar crust. We show that the presence of accreted envelopes simplifies the interpretation of observations of thermal radiation from isolated neutron stars in the scenario of Gusakov et al. (2004a) and widens the class of models for nucleon superfluidity in neutron star interiors consistent with the observations.

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