Journal article
Tracking continuous gravitational waves from a neutron star at once and twice the spin frequency with a hidden Markov model
L Sun, A Melatos, PD Lasky
Physical Review D | AMER PHYSICAL SOC | Published : 2019
Abstract
Searches for continuous gravitational waves from rapidly spinning neutron stars normally assume that the star rotates about one of its principal axes of moment of inertia, and hence the gravitational radiation emits only at twice the spin frequency of the star, 2f. The superfluid interior of a star pinned to the crust along an axis nonaligned with any of its principal axes allows the star to emit gravitational waves at both f and 2f, even without free precession, a phenomenon not clearly observed in known pulsars. The dual-harmonic emission mechanism motivates searches combining the two frequency components of a signal to improve signal-to-noise ratio. We describe an economical, semicoherent..
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Grants
Awarded by Australian Research Council
Funding Acknowledgements
We are grateful to the LIGO and Virgo Continuous Wave Working Group for informative discussions, and S. Walsh for the review and comments. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under Cooperative Agreement No. PHY-0757058. Advanced LIGO was built under Grant No. PHY-0823459. P. D. Lasky is supported through ARC Future Fellowship No. FT160100112 and Discovery Project No. DP180103155. The research is also supported by Australian Research Council (ARC) Discovery Project No. DP170103625 and the ARC Centre of Excellence for Gravitational Wave Discovery No. CE170100004. This paper carries LIGO Document No. LIGO-P1900029.