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

机译:来自凸性中子恒星表面的中微子深层地壳加热

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We present a new mechanism for deep crustal heating in accreting neutron stars. Charged pions (pi(+)) 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 approximate to 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.
机译:我们为缓和中子恒星的深层地壳加热提供了一种新机制。 在活性增生期间,在中子星表面上的核碰撞中产生带电的π(+)),并且在衰减时,它们在中微子壳中提供中微子的通量。 对于大规模和/或紧凑的中子恒星,Neyrinos将每累积核聚核群的热量1-2mev沉积在内壳中。 中核加热的强度与先前已知的深地壳加热来源相当,例如来自Pycnonu核融合反应,并且与冷却中子恒星的研究相关。 我们在低质量X射线二进制中模拟瞬态中子星的热量演变,并且在中子星MXB 1659-29的特定情况下,我们表明额外的深层地壳加热需要更高的中子星内的导热率 脆皮。 更好地了解接近阈值的磁共线横截面将提高我们预测的准确性。

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