Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model

Abbott, B. P. and Abbott, R. and Abbott, D. and Acernese, F. and Ackley, K. and Barta, Dániel and Bécsy, Bence and Frei, Zsolt and Gergely, Árpád László and Tápai, Márton and Vasúth, Mátyás Zsolt (2017) Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model. PHYSICAL REVIEW D, 95 (12). ISSN 2470-0010

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Abstract

Results are presented from a semicoherent search for continuous gravitational waves from the brightest low-mass X-ray binary, Scorpius X-1, using data collected during the first Advanced LIGO observing run. The search combines a frequency domain matched filter (Bessel-weighted F-statistic) with a hidden Markov model to track wandering of the neutron star spin frequency. No evidence of gravitational waves is found in the frequency range 60-650 Hz. Frequentist 95% confidence strain upper limits, h(0)(95%) = 4.0 x 10(-25), 8.3 x 10(-25), and 3.0 x 10(-25) for electromagnetically restricted source orientation, unknown polarization, and circular polarization, respectively, are reported at 106 Hz. They are <= 10 times higher than the theoretical torque-balance limit at 106 Hz.

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