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Search for continuous gravitational waves from 20 accreting millisecond X-ray pulsars in O3 LIGO data
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Search for continuous gravitational waves from 20 accreting millisecond X-ray pulsars in O3 LIGO data

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration, R Abbott, T. D Abbott, F Acernese, K Ackley, C Adams, N Adhikari, R. X Adhikari, …
arXiv.org
21/01/2022
DOI: https://doi.org/10.48550/arxiv.2109.09255

摘要

Physics - General Relativity and Quantum Cosmology Physics - High Energy Astrophysical Phenomena
Phys. Rev. D 105, 022002 (2022) Results are presented of searches for continuous gravitational waves from 20 accreting millisecond X-ray pulsars with accurately measured spin frequencies and orbital parameters, using data from the third observing run of the Advanced LIGO and Advanced Virgo detectors. The search algorithm uses a hidden Markov model, where the transition probabilities allow the frequency to wander according to an unbiased random walk, while the𝓙 -statistic maximum-likelihood matched filter tracks the binary orbital phase. Three narrow sub-bands are searched for each target, centered on harmonics of the measured spin frequency. The search yields 16 candidates, consistent with a false alarm probability of 30% per sub-band and target searched. These candidates, along with one candidate from an additional target-of-opportunity search done for SAX J1808.4 - 3658, which was in outburst during one month of the observing run, cannot be confidently associated with a known noise source. Additional follow-up does not provide convincing evidence that any are a true astrophysical signal. When all candidates are assumed non-astrophysical, upper limits are set on the maximum wave strain detectable at 95% confidence,h₀^(95%) . The strictest constraint ish₀^(95%) = 4.7× 10⁻²⁶from IGR J17062 - 6143. Constraints on the detectable wave strain from each target lead to constraints on neutron star ellipticity andr -mode amplitude, the strictest of which are∊^(95%) = 3.1× 10⁻⁷andα^(95%) = 1.8× 10⁻⁵respectively. This analysis is the most comprehensive and sensitive search of continuous gravitational waves from accreting millisecond X-ray pulsars to date.

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