@article{4d83ffcea6cd498ca57914724f211342,

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

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 J-statistic, and by analyzing data from Advanced LIGO''s second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h(0)(95%) = 3.47 x 10(-25) when marginalizing 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.",

keywords = "EMISSION, NOISE, RADIATION, X-RAY BINARIES",

author = "B.P. Abbott and R. Abbott and T.D. Abbott and S. Abraham and F. Acernese and K. Ackley and C. Adams and R.X. Adhikari and V.B. Adya and C. Affeldt and M. Agathos and K. Agatsuma and N. Aggarwal and O.D. Aguiar and L. Aiello and A. Ain and P. Ajith and G. Allen and A. Allocca and M.A. Aloy and P.A. Altin and A. Amato and A. Ananyeva and S.B. Anderson and W.G. Anderson and S.V. Angelova and S. Antier and S. Appert and K. Arai and M.C. Araya and J.S. Areeda and M. Arene and N. Arnaud and S. Ascenzi and G. Ashton and S.M. Aston and P. Astone and F. Aubin and P. Aufmuth and K. AultONeal and C. Austin and V. Avendano and A. Avila-Alvarez and S. Babak and P. Bacon and F. Badaracco and M.K.M. Bader and S. Bae and P.T. Baker and F. Baldaccini and Gideon Koekoek and {Virgo Collaboration} and {LIGO Scientific Collaboration}",

year = "2019",

month = dec,

day = "4",

doi = "10.1103/PhysRevD.100.122002",

language = "English",

volume = "100",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "American Physical Society",

number = "12",

}