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

B. P. Abbott, S. Jawahar, N. A. Lockerbie, K. V. Tokmakov, LIGO Scientific Collaboration, Virgo Collaboration

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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, h95%0=4.0×10−25, 8.3×10−25, and 3.0×10−25 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.
Original languageEnglish
Article number122003
Number of pages20
JournalPhysical Review D
Issue number12
Publication statusPublished - 27 Jun 2017


  • LIGO
  • Markov models
  • gravitational waves
  • neutron stars
  • Scorpious X-1

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