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 \(h_c(f)\) 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.
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The second author, PY would like to thank D. I. Jones and Garvin Yim for useful discussion. The authors would also like to thank the anonymous reviewers for critical comments and suggestions on the previous version of this manuscript.
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Layek, B., Yadav, P. Bursts of gravitational waves due to crustquake from pulsars. J Astrophys Astron 41, 14 (2020). https://doi.org/10.1007/s12036-020-09631-0
- Neutron star
- gravitational wave