Thermal evolution and quiescent emission of transiently accreting neutron stars

@article{Potekhin2019ThermalEA,
  title={Thermal evolution and quiescent emission of transiently accreting neutron stars},
  author={Alexander Y. Potekhin and Andrey I Chugunov and Gilles Chabrier},
  journal={Astronomy \& Astrophysics},
  year={2019}
}
Aims. We study the long-term thermal evolution of neutron stars in soft X-ray transients (SXTs), taking the deep crustal heating into account consistently with the changes of the composition of the crust. We collect observational estimates of average accretion rates and thermal luminosities of such neutron stars and compare the theory with observations. Methods. We performed simulations of thermal evolution of accreting neutron stars, considering the gradual replacement of the original… Expand
Thermal state of transiently accreting neutron stars with additional heating beyond deep crustal heating
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References

SHOWING 1-10 OF 157 REFERENCES
Thermal state of transiently accreting neutron stars
We study thermal states of transiently accreting neutron stars (with mean accretion rates u M ∼ 10 −14 −10 −9 Myr −1 ) determined by the deep crustal heating of accreted matter sinking into stellarExpand
Crustal Heating and Quiescent Emission from Transiently Accreting Neutron Stars
Nuclear reactions occurring at densities ≈ 1012 g cm-3 in the crust of a transiently accreting neutron star efficiently maintain the core at a temperature ≈ (5-10)×107 K. When accretion halts, theExpand
Statistical theory of thermal evolution of neutron stars
Thermal evolution of neutron stars is known to depend on the properties of superdense matter in neutron star cores. We suggest a statistical analysis of isolated cooling middle-aged neutron stars andExpand
Cooling of Accretion-Heated Neutron Stars
We present a brief, observational review about the study of the cooling behaviour of accretion-heated neutron stars and the inferences about the neutron-star crust and core that have been obtainedExpand
A DIRECT MEASUREMENT OF THE HEAT RELEASE IN THE OUTER CRUST OF THE TRANSIENTLY ACCRETING NEUTRON STAR XTE J1709−267
The heating and cooling of transiently accreting neutron stars provides a powerful probe of the structure and composition of their crust. Observations of superbursts and cooling of accretion-heatedExpand
Thermal states of coldest and hottest neutron stars in soft X-ray transients
We calculate the thermal structure and quiescent thermal luminosity of accreting neutron stars (warmed by deep crustal heating in accreted matter) in soft X-ray transients (SXTs). We consider neutronExpand
Thermal evolution of accreting neutron stars. II. Long X-ray bursts as a probe into the interior
The possibility of distinguishing various internal thermal states of accreting neutron stars on the basis of the observed properties of X-ray bursts is demonstrated. For neutron stars with low coreExpand
Quiescent thermal emission from neutron stars in low-mass X-ray binaries
Context. We monitored the quiescent thermal emission from neutron stars in low-mass X-ray binaries after active periods of intense activity in X-rays (outbursts). Aims. The theoretical modeling ofExpand
Crustal heating in accreting neutron stars from the nuclear energy-density functional theory: I. Proton shell effects and neutron-matter constraint
Context. X-ray observations of soft X-ray transients in quiescence suggest the existence of heat sources in the crust of accreted neutron stars. Heat is thought to be released by electroweak andExpand
Nuclear Reactions in the Crusts of Accreting Neutron Stars
X-ray observations of transiently accreting neutron stars during quiescence provide information about the structure of neutron star crusts and the properties of dense matter. Interpretation of theExpand
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