Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Aasi, J. et al. (2015) Directed search for gravitational waves from Scorpius X-1 with initial LIGO data. Physical Review D, 91(6), 062008. (doi: 10.1103/PhysRevD.91.062008)

Abstract

We present results of a search for continuously emitted gravitational radiation, directed at the brightest low-mass x-ray binary, Scorpius X-1. Our semicoherent analysis covers 10 days of LIGO S5 data ranging from 50–550 Hz, and performs an incoherent sum of coherent F-statistic power distributed amongst frequency-modulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitational-wave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X-1; and an angle-restricted one, using a prior derived from electromagnetic observations. Median strain upper limits of 1.3×10−24 and 8×10−25 are reported at 150 Hz for the standard and angle-restricted searches respectively. This proof-of-principle analysis was limited to a short observation time by unknown effects of accretion on the intrinsic spin frequency of the neutron star, but improves upon previous upper limits by factors of ∼1.4 for the standard, and 2.3 for the angle-restricted search at the sensitive region of the detector.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Grant, Mr Alastair and Bell, Mr Christopher and Messenger, Dr Christopher and Bell, Dr Angus and Hammond, Professor Giles and Hild, Professor Stefan and Barr, Dr Bryan and Sorazu Lucio, Dr Borja and Craig, Mr Kieran and Leavey, Mr Sean and Steinlechner, Dr Jessica and Logue, Mr Joshua and Veitch, Dr John and Heng, Professor Ik Siong and van Veggel, Dr Marielle and Newton, Dr Gavin and Torrie, Dr Calum and Davies, Mr Gareth and Hu, Mr Yiming and Graef, Dr Christian and Douglas, Miss Rebecca and Hendry, Professor Martin and Abernathy, Mr Matthew and Rowan, Professor Sheila and Santiago Prieto, Mr Ricardo and MacArthur, Mr John and Martin, Dr Iain and Robertson, Professor Norna and Cumming, Dr Alan and Berry, Dr Christopher and Cunningham, Dr Liam and Woan, Professor Graham and Steinlechner, Dr Sebastian and Hough, Professor James and Huttner, Dr Sabina and Strain, Professor Kenneth and Jones, Mr Russell and Haughian, Dr Karen and Murray, Dr Peter and Pitkin, Dr Matthew
• Authors: Aasi, J., Abbott, B. P., Abbott, R., Abbott, T., Abernathy, M. R., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R. X., Adya, V., Affeldt, C., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O. D., Ain, A., Ajith, P., Alemic, A., Allen, B., Allocca, A., Amariutei, D., Anderson, S. B., Anderson, W. G., Arai, K., Araya, M. C., Arceneaux, C., Areeda, J. S., Arnaud, N., Ashton, G., Ast, S., Aston, S. M., Astone, P., Aufmuth, P., Aulbert, C., Aylott, B. E., Babak, S., Baker, P. T., Baldaccini, F., Ballardin, G., Ballmer, S. W., Barayoga, J. C., Barbet, M., Barclay, S., Barish, B. C., Barker, D., Barone, F., Barr, B., Barsotti, L., Barsuglia, M., Bartlett, J., Barton, M. A., Bartos, I., Bassiri, R., Basti, A., Batch, J. C., Bauer, T. S., Baune, C., Bavigadda, V., Behnke, B., Bejger, M., Belczynski, C., Bell, A. S., Bell, C., Benacquista, M., Bergman, J., Bergmann, G., Berry, C. P. L., Bersanetti, D., Bertolini, A., Betzwieser, J., Bhagwat, S., Bhandare, R., Bilenko, I. A., Billingsley, G., Birch, J., Biscans, S., Bitossi, M., Biwer, C., Bizouard, M. A., Blackburn, J. K., Blackburn, L., Blair, C. D., Blair, D., Bloemen, S., Bock, O., Bodiya, T. P., Boer, M., Bogaert, G., Bojtos, P., Bond, C., Bondu, F., Bonelli, L., Bonnand, R., Bork, R., Born, M., Boschi, V., Bose, S., Bradaschia, C., Brady, P. R., Braginsky, V. B., Branchesi, M., Brau, J. E., Briant, T., Bridges, D. O., Brillet, A., Brinkmann, M., Brisson, V., Brooks, A. F., Brown, D. A., Brown, D. D., Brown, N. M., Buchman, S., Buikema, A., Bulik, T., Bulten, H. J., Buonanno, A., Buskulic, D., Buy, C., Cadonati, L., Cagnoli, G., Calderón Bustillo, J., Calloni, E., Camp, J. B., Cannon, K. C., Cao, J., Capano, C. D., Capocasa, E., Carbognani, F., Caride, S., Diaz, J. C., Caudill, S., Cavaglià, M., Cavalier, F., Cavalieri, R., Cella, G., Cepeda, C., Cesarini, E., Chakraborty, R., Chalermsongsak, T., Chamberlin, S. J., Chao, S., Charlton, P., Chassande-Mottin, E., Chen, Y., Chincarini, A., Chiummo, A., Cho, H. S., Cho, M., Chow, J. H., Christensen, N., Chu, Q., Chua, S., Chung, S., Ciani, G., Clara, F., Clark, J. A., Cleva, F., Coccia, E., Cohadon, P.-F., Colla, A., Collette, C., Colombini, M., Cominsky, L., Constancio, M., Conte, A., Cook, D., Corbitt, T. R., Cornish, N., Corsi, A., Costa, C. A., Coughlin, M. W., Coulon, J.-P., Countryman, S., Couvares, P., Coward, D. M., Cowart, M. J., Coyne, D. C., Coyne, R., Craig, K., Creighton, J. D. E., Creighton, T. D., Cripe, J., Crowder, S. G., Cumming, A., Cunningham, L., Cuoco, E., Cutler, C., Dahl, K., Dal Canton, T., Damjanic, M., Danilishin, S. L., D’Antonio, S., Danzmann, K., Dartez, L., Dattilo, V., Dave, I., Daveloza, H., Davier, M., Davies, G. S., Daw, E. 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• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Centre: College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 1550-7998
• ISSN (Online): 1550-2368