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

Document #:
LIGO-P1800208-v7
Document type:
P - Publications
Other Versions:
 LIGO-P1800208-v9 06 Dec 2019, 22:40
Abstract:
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 $$\mathcal{J}$$-statistic, and by analysing data from Advanced LIGO's second observing 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 upper limit on gravitational wave strain (at 95\% confidence) of $$h_0^{95\%} = 3.47 \times 10^{-25}$$ when marginalising over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering.
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