Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
Source
Physical Review D
ISSN
24700010
Date Issued
2017-06-15
Author(s)
Abbott, B. P.
Abbott, R.
Abbott, T. D.
Acernese, F.
Ackley, K.
Adams, C.
Adams, T.
Addesso, P.
Adhikari, R. X.
Adya, V. B.
Affeldt, C.
Afrough, M.
Agarwal, B.
Agatsuma, K.
Aggarwal, N.
Aguiar, O. D.
Aiello, L.
Ain, A.
Ajith, P.
Allen, B.
Allen, G.
Allocca, A.
Almoubayyed, H.
Altin, P. A.
Amato, A.
Ananyeva, A.
Anderson, S. B.
Anderson, W. G.
Antier, S.
Appert, S.
Arai, K.
Araya, M. C.
Areeda, J. S.
Arnaud, N.
Arun, K. G.
Ascenzi, S.
Ashton, G.
Ast, M.
Aston, S. M.
Astone, P.
Aufmuth, P.
Aulbert, C.
Aultoneal, K.
Avila-Alvarez, A.
Babak, S.
Bacon, P.
Bader, M. K.M.
Bae, S.
Baker, P. T.
Baldaccini, F.
Ballardin, G.
Ballmer, S. W.
Banagiri, S.
Barayoga, J. C.
Barclay, S. E.
Barish, B. C.
Barker, D.
Barone, F.
Barr, B.
Barsotti, L.
Barsuglia, M.
Barta, D.
Bartlett, J.
Bartos, I.
Bassiri, R.
Basti, A.
Batch, J. C.
Baune, C.
Bawaj, M.
Bazzan, M.
Bécsy, B.
Beer, C.
Bejger, M.
Belahcene, I.
Bell, A. S.
Berger, B. K.
Bergmann, G.
Berry, C. P.L.
Bersanetti, D.
Bertolini, A.
Etienne, Z. B.
Betzwieser, J.
Bhagwat, S.
Bhandare, R.
Bilenko, I. A.
Billingsley, G.
Billman, C. R.
Birch, J.
Birney, R.
Birnholtz, O.
Biscans, S.
Bisht, A.
Bitossi, M.
Biwer, C.
Bizouard, M. A.
Blackburn, J. K.
Blackman, J.
Blair, C. D.
Blair, D. G.
Blair, R. M.
Abstract
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, h095%=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.