We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the g-statistic, and by analyzing data from Advance LIGO's second observing run. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is spectifically designed to be robust in the presence of spin wandering.
We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the g-statistic, and by analyzing data from Advance LIGO's second observing run. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is spectifically designed to be robust in the presence of spin wandering.