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Title: Deep crustal heating by neutrinos from the surface of accreting neutron stars

Journal Article · · Physical Review C
 [1];  [2];  [3];  [1];  [1];  [4];  [1]
  1. Indiana Univ., Bloomington, IN (United States)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. McGill Univ., Montreal, QC (Canada)
  4. Texas A & M Univ., Commerce, TX (United States)

Here, we present a new mechanism for deep crustal heating in accreting neutron stars. Charged pions (π+) are produced in nuclear collisions on the neutron star surface during active accretion and upon decay they provide a flux of neutrinos into the neutron star crust. For massive and/or compact neutron stars, neutrinos deposit ≈ 1 – 2 MeV of heat per accreted nucleon into the inner crust. The strength of neutrino heating is comparable to the previously known sources of deep crustal heating, such as from pycnonuclear fusion reactions, and is relevant for studies of cooling neutron stars. We model the thermal evolution of a transient neutron star in a low-mass x-ray binary, and in the particular case of the neutron star MXB 1659-29 we show that additional deep crustal heating requires a higher thermal conductivity for the neutron star inner crust. A better knowledge of pion-production cross sections near threshold would improve the accuracy of our predictions.

Research Organization:
Texas A & M Univ., Commerce, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0013702; FG02-87ER40365; SC0008808; 11320101004; AST100014; AST-1516969
OSTI ID:
1658221
Alternate ID(s):
OSTI ID: 1464329
Journal Information:
Physical Review C, Vol. 98, Issue 2; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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