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arXiv 0909.4035astro-ph.SRgr-qc
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旋转超流中子星的引力波发射

Gravitational wave emission from rotating superfluid neutron stars

D. I. Jones

摘要:

本文研究了定常旋转形变中子星中钉扎超流分量对引力波辐射的影响。我们表明,超流钉扎允许的可能性,有引力波发射在恒星的自旋频率$Ω$和它的第一谐波,$2Ω$。这与没有被钉扎超流的传统情况形成对比,在传统情况下,要么只有$2Ω$谐波存在,要么恒星经历岁差,这一特征在已知的脉冲星群中并不常见。这项工作激励了进行引力波搜索,其中搜索$Ω$和$2Ω$谐波,即使是在有针对性的搜索来自已知恒星的波,没有观察到进动。对这种双分量信号的观测将提供支持恒星内部钉扎超流性的证据。

英文摘要:

In this paper we investigate the effect of a pinned superfluid component on the gravitational wave emission of a steadily rotating deformed neutron star. We show that the superfluid pinning allows the possibility for there to be gravitational wave emission at both the stellar spin frequency $Ω$ and its first harmonic, $2Ω$. This contrasts with the conventional case where there is no pinned superfluidity, where either only the $2Ω$ harmonic is present, or else the star undergoes precession, a feature which is not believed to be common in the known pulsar population. This work motivates the carrying out of gravitational wave searches where both the $Ω$ and $2Ω$ harmonics are searched for, even in targeted searches for waves from known pulsars which aren't observed to precess. Observation of such a two-component signal would provide evidence in favour of pinned superfluidity inside the star.

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