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We simulate cooling of superfluid neutron stars with nucleon cores where direct Urca process is forbidden. We adopt density dependent critical temperatures $T_{cp}(\rho)$ and $T_{cn}(\rho)$ of singlet-state proton and triplet-state neutron…

天体物理学 · 物理学 2009-11-10 M. E. Gusakov , A. D. Kaminker , D. G. Yakovlev , O. Y. Gnedin

We study the heat capacity and neutrino emission reactions (direct and modified Urca processes, nucleon-nucleon bremsstrahlung, Cooper pairing of nucleons) in matter of supranuclear density of the neutron star cores with superfluid neutrons…

天体物理学 · 物理学 2011-02-16 D. G. Yakovlev , K. P. Levenfish , Yu. A. Shibanov

Cooling simulations of neutron stars (NSs) are performed assuming that stellar cores consist of neutrons, protons and electrons and using realistic density profiles of superfluid critical temperatures $T_{cn}(\rho)$ and $T_{cp}(\rho)$ of…

天体物理学 · 物理学 2009-11-06 A. D. Kaminker , P. Haensel , D. G. Yakovlev

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…

天体物理学 · 物理学 2009-11-13 A. D. Kaminker , M. E. Gusakov , D. G. Yakovlev , O. Y. Gnedin

Calculations are performed of the cooling of neutron stars with standard and enhanced neutrino energy losses in the presence of neutron and proton superfluidities in the stellar cores. The effects of superfluidity on the heat capacity and…

天体物理学 · 物理学 2007-05-23 K. P. Levenfish , D. G. Yakovlev

Cooling of neutron stars (NSs) with the cores composed of neutrons, protons, and electrons is simulated assuming $^1$S$_0$ pairing of neutrons in the NS crust, and also $^1$S$_0$ pairing of protons and weak $^3$P$_2$ pairing of neutrons in…

天体物理学 · 物理学 2009-11-07 A. D. Kaminker , D. G. Yakovlev , O. Y. Gnedin

Cooling of neutron stars (NSs) with superfluid cores is simulated taking into account neutrino emission produced by Cooper pairing of nucleons. The critical temperatures of neutron and proton superfluidities, $T_{cn}$ and $T_{cp}$, are…

天体物理学 · 物理学 2007-05-23 K. P. Levenfish , Yu. A. Shibanov , D. G. Yakovlev

The neutrino energy emission rate due to formation of Cooper pairs of neutrons and protons in the superfluid cores of neutron stars is studied. The cases of singlet-state pairing with isotropic superfluid gap and triplet-state pairing with…

天体物理学 · 物理学 2011-05-23 D. G. Yakovlev , A. D. Kaminker , K. P. Levenfish

We investigate the combined effect of neutron and proton superfluidities on the cooling of neutron stars whose cores consist of nucleons and electrons. We consider singlet-state pairing of protons and triplet-state pairing of neutrons in…

天体物理学 · 物理学 2009-11-10 M. E. Gusakov , A. D. Kaminker , D. G. Yakovlev , O. Y. Gnedin

We consider cooling of neutron stars (NSs) with superfluid cores composed of neutrons, protons, and electrons (assuming singlet-state pairing of protons, and triplet-state pairing of neutrons). We mainly focus on (nonstandard) triplet-state…

天体物理学 · 物理学 2009-11-07 M. E. Gusakov , O. Y. Gnedin

Observation of cooling neutron stars can potentially provide information about the states of matter at supernuclear densities. We review physical properties important for cooling such as neutrino emission processes and superfluidity in the…

天体物理学 · 物理学 2009-11-10 D. G. Yakovlev , C. J. Pethick

Cooling of neutron stars (NSs) with the cores composed of neutrons, protons, and electrons is analyzed. The main cooling regulators are discussed: opening of direct Urca process in a NS central kernel; superfluidity of nucleons in NS…

天体物理学 · 物理学 2007-05-23 D. G. Yakovlev , O. Y. Gnedin , A. D. Kaminker , A. Y. Potekhin

We model the thermal states of both isolated neutron stars and accreting neutron stars in X-ray transients in quiescence and confront them with observations. We use an equation of state and superfluid baryon gaps, which are consistently…

高能天体物理现象 · 物理学 2018-01-31 M. Fortin , G. Taranto , G. F. Burgio , P. Haensel , H. -J. Schulze , J. L. Zdunik

We demonstrate that the existing neutron-star cooling data can be appropriately described within "the nuclear medium cooling scenario" including hyperons under the assumption that different sources have different masses. We use a stiff…

高能天体物理现象 · 物理学 2018-11-14 Hovik Grigorian , Dmitry N. Voskresensky , Konstantin A. Maslov

The cooling theory of isolated neutron stars is reviewed. The main cooling regulators are discussed, first of all, operation of direct Urca process (or similar processes in exotic phases of dense matter) and superfluidity in stellar…

天体物理学 · 物理学 2007-05-23 D. G. Yakovlev , O. Y. Gnedin , A. D. Kaminker , K. P. Levenfish , A. Y. Potekhin

We model neutron star cooling with several microscopic nuclear equations of state based on different nucleon-nucleon interactions and three-body forces, and compatible with the recent GW170817 neutron star merger event. They all feature…

高能天体物理现象 · 物理学 2020-01-16 J. -B. Wei , G. F. Burgio , H. -J. Schulze

We consider models of cooling neutron stars with nucleon cores which possess moderately strong triplet-state superfluidity of neutrons. When the internal temperature drops below the maximum of the critical temperature over the core, $T_{\rm…

太阳与恒星天体物理 · 物理学 2014-12-15 P. S. Shternin , D. G. Yakovlev

Modelling of crust heating and cooling across multiple accretion outbursts of the low mass X-ray binary MXB 1659-29 indicates that the neutrino luminosity of the neutron star core is consistent with direct Urca reactions occurring in $\sim…

高能天体物理现象 · 物理学 2022-10-21 Melissa Mendes , Farrukh J. Fattoyev , Andrew Cumming , Charles Gale

A new classification of neutron star cooling scenarios, involving either ``minimal'' cooling or ``enhanced'' cooling is proposed. The minimal cooling scenario replaces and extends the so-called standard cooling scenario to include neutrino…

天体物理学 · 物理学 2011-09-29 Dany Page , James M. Lattimer , Madappa Prakash , Andrew W. Steiner

We study the cooling of isolated neutron stars, employing different nuclear equations of state with or without active direct Urca process, and investigate the interplay with the nuclear pairing gaps. We find that a consistent description of…

高能天体物理现象 · 物理学 2024-06-12 H. C. Das , Jin-Biao Wei , G. F. Burgio , H. -J. Schulze
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