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, h095%=4.0Ã—10-25, 8.3Ã—10-25, and 3.0Ã—10-25 for electromagnetically restricted source orientation, unknown polarization, and circular polarization, respectively, are reported at 106 Hz. They are â‰¤10 times higher than the theoretical torque-balance limit at 106 Hz.
B. P. Abbott, et. al., (2017) Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model.Physical Review D95:12. DOI: http://doi.org/10.1103/PhysRevD.95.122003
Physical Review D