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Abbott, R.; Ackley, K.; Adya, V. B.; Barone, F.; Bassiri, R.; Belahcene, I.; Berger, B. K.; Berry, C. P. L.; Bisht, A.; Blair, R. M.; Brockill, P.; Buy, C.; Cannon, K. C.; Cerretani, G.; Coughlin, M. W.; Coughlin, S. B.; Creighton, J. D. E.; Creighton, T. D.; Crowder, S. G.; Degallaix, J.; DeRosa, R. T.; Lieto, A. Di; Driggers, J. C.; Eichholz, J.; Ferrante, I.; Freise, A.; Fritschel, P.; Frolov, V. V.; Gadre, B. U.; Ganija, M. R.; Gaonkar, S. G.; Granata, M.; Greco, G.; Grote, H.; Gruning, P.; Hall, B. R.; Hall, E. D.; Haughian, K.; Heitmann, H.; Hemming, G.; Heptonstall, A. W.; Husa, S.; Kawabe, K.; Kissel, J. S.; Kondrashov, V.; Laxen, M.; Lazzarini, A.; Losurdo, G.; Lynch, R.; Machenschalk, B.; Masserot, A.; Massinger, T. J.; Masso-Reid, M.; Matichard, F.; McCuller, L.; McGuire, S. C.; McIver, J.; Merilh, E. L.; Middleton, H.; Moreno, G.; Mukherjee, Arunava; Mullavey, A.; Nguyen, T. T.; Pai, A.; Pinard, L.; Popolizio, P.; Post, A.; Prijatelj, M.; Raab, F. J.; Raffai, P.; Rakhmanov, M.; Read, J.; Robie, R.; Salconi, L.; Sandeen, B.; Schmidt, E.; Schmidt, P.; Scott, J.; Sieniawska, M.; Souradeep, T.; Srivastava, A. K.; Sturani, R.; Szczepa czyk, M. J.; Tacca, M.; Taracchini, A.; Taylor, R.; Trozzo, L.; Tso, R.; Tuyenbayev, D.; Vajente, G.; Van Den Broeck, C.; Vass, S.; Weiss, R.; Williams, R. D.; Wipf, C. C.; Wu, D. S.; Yamamoto, H.; Yancey, C. C.; Zelenova, T.; Steeghs, D.
The Astrophysical journal, 09/2017, Letnik: 847, Številka: 1Journal Article, Web Resource
We present the results of a semicoherent search for continuous gravitational waves from the low-mass X-ray binary Scorpius X-1, using data from the first Advanced LIGO observing run. The search method uses details of the modeled, parametrized continuous signal to combine coherently data separated by less than a specified coherence time, which can be adjusted to trade off sensitivity against computational cost. A search was conducted over the frequency range 25- , spanning the current observationally constrained range of binary orbital parameters. No significant detection candidates were found, and frequency-dependent upper limits were set using a combination of sensitivity estimates and simulated signal injections. The most stringent upper limit was set at , with comparable limits set across the most sensitive frequency range from 100 to . At this frequency, the 95% upper limit on the signal amplitude h0 is marginalized over the unknown inclination angle of the neutron star's spin, and assuming the best orientation (which results in circularly polarized gravitational waves). These limits are a factor of 3-4 stronger than those set by other analyses of the same data, and a factor of ∼7 stronger than the best upper limits set using data from Initial LIGO science runs. In the vicinity of , the limits are a factor of between 1.2 and 3.5 above the predictions of the torque balance model, depending on the inclination angle; if the most likely inclination angle of 44° is assumed, they are within a factor of 1.7.
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