@article{627d781735564715b46f1f803a6e6e84,

title = "Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data",

abstract = "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 25-2000 Hz, 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 175 Hz, with comparable limits set across the most sensitive frequency range from 100 to 200 Hz. At this frequency, the 95% upper limit on the signal amplitude h0 is 2.3 × 10-25 marginalized over the unknown inclination angle of the neutron star's spin, and 8.0 × 10-26 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 100 Hz, 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.",

keywords = "accretion, accretion disks, gravitational waves, stars: neutron, X-rays: binaries",

author = "{LIGO Scientific Collaboration and Virgo Collaborations} and Abbott, {B. P.} and R. Abbott and Abbott, {T. D.} and F. Acernese and K. Ackley and C. Adams and T. Adams and P. Addesso and Adhikari, {R. X.} and Adya, {V. B.} and C. Affeldt and M. Afrough and B. Agarwal and M. Agathos and K. Agatsuma and N. Aggarwal and Aguiar, {O. D.} and L. Aiello and A. Ain and P. Ajith and B. Allen and G. Allen and A. Allocca and Altin, {P. A.} and A. Amato and A. Ananyeva and Anderson, {S. B.} and Anderson, {W. G.} and S. Antier and S. Appert and K. Arai and Araya, {M. C.} and Areeda, {J. S.} and N. Arnaud and Arun, {K. G.} and S. Ascenzi and G. Ashton and M. Ast and Aston, {S. M.} and P. Astone and P. Aufmuth and C. Aulbert and K. Aultoneal and A. Avila-Alvarez and S. Babak and P. Bacon and Bader, {M. K.M.} and S. Bae and Baker, {P. T.} and F. Baldaccini and G. Ballardin and Ballmer, {S. W.} and S. Banagiri and Barayoga, {J. C.} and Barclay, {S. E.} and Barish, {B. C.} and D. Barker and F. Barone and B. Barr and L. Barsotti and M. Barsuglia and D. Barta and J. Bartlett and I. Bartos and R. Bassiri and A. Basti and Batch, {J. C.} and C. Baune and M. Bawaj and M. Bazzan and B. B{\'e}csy and C. Beer and M. Bejger and I. Belahcene and Bell, {A. S.} and Berger, {B. K.} and G. Bergmann and Berry, {C. P.L.} and D. Bersanetti and A. Bertolini and J. Betzwieser and S. Bhagwat and R. Bhandare and Bilenko, {I. A.} and G. Billingsley and Billman, {C. R.} and J. Birch and R. Birney and O. Birnholtz and S. Biscans and A. Bisht and M. Bitossi and C. Biwer and Bizouard, {M. A.} and Blackburn, {J. K.} and J. Blackman and Blair, {C. D.} and Blair, {D. G.} and Blair, {R. M.} and S. Bloemen and O. Bock and N. Bode and M. Boer and G. Bogaert and A. Bohe and F. Bondu and R. Bonnand and Boom, {B. A.} and R. Bork and V. Boschi and S. Bose and Y. Bouffanais and A. Bozzi and C. Bradaschia and Brady, {P. R.} and Braginsky, {V. B.} and M. Branchesi and Brau, {J. E.} and T. Briant and A. Brillet and M. Brinkmann and V. Brisson and P. Brockill and Broida, {J. E.} and Brooks, {A. F.} and Brown, {D. A.} and Brown, {D. D.} and Brown, {N. M.} and S. Brunett and Buchanan, {C. C.} and A. Buikema and T. Bulik and Bulten, {H. J.} and A. Buonanno and D. Buskulic and C. Buy and Byer, {R. L.} and M. Cabero and L. Cadonati and G. Cagnoli and C. Cahillane and Bustillo, {J. Calder{\'o}n} and Callister, {T. A.} and E. Calloni and Camp, {J. B.} and M. Canepa and P. Canizares and Cannon, {K. C.} and H. Cao and J. Cao and Capano, {C. D.} and E. Capocasa and F. Carbognani and S. Caride and Carney, {M. F.} and Diaz, {J. Casanueva} and C. Casentini and S. Caudill and M. Cavagli{\`a} and F. Cavalier and R. Cavalieri and G. Cella and Cepeda, {C. B.} and Baiardi, {L. Cerboni} and G. Cerretani and E. Cesarini and Chamberlin, {S. J.} and M. Chan and S. Chao and P. Charlton and E. Chassande-Mottin and D. Chatterjee and K. Chatziioannou and Cheeseboro, {B. D.} and Chen, {H. Y.} and Y. Chen and Cheng, {H. P.} and A. Chincarini and A. Chiummo and T. Chmiel and Cho, {H. S.} and M. Cho and Chow, {J. H.} and N. Christensen and Q. Chu and Chua, {A. J.K.} and S. Chua and Chung, {A. K.W.} and S. Chung and G. Ciani and R. Ciolfi and Cirelli, {C. E.} and A. Cirone and F. Clara and Clark, {J. A.} and F. Cleva and C. Cocchieri and E. Coccia and Cohadon, {P. F.} and A. Colla and Collette, {C. G.} and Cominsky, {L. R.} and M. Constancio and L. Conti and Cooper, {S. J.} and P. Corban and Corbitt, {T. R.} and Corley, {K. R.} and N. Cornish and A. Corsi and S. Cortese and Costa, {C. A.} and Coughlin, {M. W.} and Coughlin, {S. B.} and Coulon, {J. P.} and Countryman, {S. T.} and P. Couvares and Covas, {P. B.} and Cowan, {E. E.} and Coward, {D. M.} and Cowart, {M. J.} and Coyne, {D. C.} and R. Coyne and Creighton, {J. D.E.} and Creighton, {T. D.} and J. Cripe and Crowder, {S. G.} and Cullen, {T. J.} and A. Cumming and L. Cunningham and E. Cuoco and Canton, {T. Dal} and Danilishin, {S. L.} and S. D'Antonio and K. Danzmann and A. Dasgupta and {Da Silva Costa}, {C. F.} and V. Dattilo and I. Dave and M. Davier and D. Davis and Daw, {E. J.} and B. Day and S. De and Howell, {E. J.} and L. Ju and Page, {M. A.} and L. Wen and C. Zhao and Zhu, {X. J.}",

year = "2017",

month = sep,

day = "20",

doi = "10.3847/1538-4357/aa86f0",

language = "English",

volume = "847",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "1",

}