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Bursts of gravitational waves due to crustquake from pulsars
Journal of Astrophysics and Astronomy ( IF 1.1 ) Pub Date : 2020-06-04 , DOI: 10.1007/s12036-020-09631-0
Biswanath Layek , Pradeepkumar Yadav

We revisit here a possibility of generation of gravitational wave (GW) bursts due to a very quick change in the quadrupole moment (QM) of a deformed spheroidal pulsar as a result of crustquake. Since it was originally proposed as a possible explanation for sudden spin-up (glitch) of pulsars, the occurrence of crustquake and its various consequences have been studied and discussed quite often in the literature. Encouraged by recent development in gravitational wave (GW) astronomy, we re-investigate the role of crustquake in the emission of GWs. Assuming exponential decay of excitation caused by crustquake, we have performed a Fourier analysis to estimate the GW strain amplitude h ( t ), characteristic signal amplitude $$h_c(f)$$ h c ( f ) and signal-to-noise ratio (SNR) of the burst for the Crab pulsar. For exotic quark stars, multifold enhancement of these quantities are expected, which might make quark star a potential source of gravitational waves. The absence of such bursts may put several constraints on pulsars and such hypothetical stars.

中文翻译:

脉冲星地壳地震引起的引力波爆发

我们在这里重新讨论了由于地壳地震导致变形球状脉冲星的四极矩 (QM) 发生非常快速的变化而产生引力波 (GW) 爆发的可能性。由于它最初被提出作为脉冲星突然旋转(故障)的可能解释,因此在文献中经常研究和讨论地壳地震的发生及其各种后果。受到引力波 (GW) 天文学最近发展的鼓舞,我们重新研究了地壳地震在 GW 发射中的作用。假设由地壳地震引起的激发指数衰减,我们已经进行了傅立叶分析来估计 GW 应变幅度 h ( t )、特征信号幅度 $$h_c(f)$$hc ( f ) 和信噪比 (SNR) ) 的 Crab 脉冲星爆发。对于奇异的夸克星,预计这些量会成倍增加,这可能会使夸克星成为引力波的潜在来源。没有这样的爆发可能会对脉冲星和这样的假设恒星产生一些限制。
更新日期:2020-06-04
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