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We present results from a semicoherent search for continuous gravitationalwaves 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-basedsearches of LIGO data by using an improved frequency domain matched filter, the$\mathcal{J}$-statistic, and by analysing data from Advanced LIGO's secondobserving run. In the frequency range searched, from $60$ to$650\,\mathrm{Hz}$, we find no evidence of gravitational radiation. At$194.6\,\mathrm{Hz}$, the most sensitive search frequency, we report an upperlimit on gravitational wave strain (at 95\% confidence) of $h_0^{95\%} = 3.47\times 10^{-25}$ when marginalising over source inclination angle. This is themost sensitive search for Scorpius X-1, to date, that is specifically designedto be robust in the presence of spin wandering.

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model