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Lower limit on the heat capacity of the neutron star core

机译:中子星核的热容量下限

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We show that observations of the core temperature of transiently accreting neutron stars combined with observations of an accretion outburst give a lower limit to the neutron star core heat capacity. For the neutron stars in the low mass x-ray binaries KS 1731-260, MXB 1659-29, and XTE J1701-462, we show that the lower limit is a factor of a few below the core heat capacity expected if neutrons and protons in the core are paired, so that electrons provide the dominant contribution to the heat capacity. This limit rules out a core dominated by a quark color-flavor-locked phase, which would have a much lower heat capacity. Future observations of or limits on cooling during quiescence will further constrain the core heat capacity.
机译:我们表明,对瞬时吸积中子星的核心温度的观测,结合对吸积爆发的观测,给出了中子星核心热容的下限。对于低质量x射线双星KS 1731-260、MXB 1659-29和XTE J1701-462中的中子星,我们表明,如果核心中的中子和质子成对,下限比预期的核心热容低几倍,因此电子对热容起主要作用。这个极限排除了由夸克色味锁定相主导的核心,它的热容要低得多。未来对静止期间冷却的观察或限制将进一步限制堆芯热容。

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