Aasi, J. and Abbott, B. P. and Abbott, R. and Abernathy, M. R. and Adhikari, R. X. and Anderson, S. B. and Arai, K. and Araya, M. and Barayoga, J. C. and Barish, B. C. and Billingsley, G. and Blackburn, J. K. and Bork, R. and Brooks, A. F. and Cepeda, C. and Chakraborty, R. and Chalermsongsak, T. and Coyne, D. C. and Dergachev, V. and Driggers, J. C. and Ehrens, P. and Etzel, T. and Gushwa, K. and Gustafson, E. K. and Hall, E. D. and Heptonstall, A. W. and Hodge, K. A. and Jacobson, M. and Kanner, J. B. and Kells, W. and Kondrashov, V. and Korth, W. Z. and Kozak, D. B. and Lazzarini, A. and Lewis, J. and Li, T. G. F. and Libbrecht, K. and Mageswaran, M. and Mailand, K. and Maros, E. and Martynov, D. and Marx, J. N. and McIntyre, G. and Meshkov, S. and Nash, T. and Osthelder, C. and Pedraza, M. and Phelps, M. and Price, L. R. and Privitera, S. and Quintero, E. and Raymond, V. and Rollins, J. G. and Sachdev, S. and Sannibale, V. and Shao, Z. and Singer, A. and Singer, L. and Smith, M. R. and Smith, R. J. E. and Smith-Lefebvre, N. D. and Taylor, R. and Thirugnanasambandam, M. P. and Thrane, E. and Vajente, G. and Vass, S. and Wallace, L. and Weinstein, A. J. and Williams, R. and Yamamoto, H. and Zhang, L. and Zweizig, J. and Chen, Y. and Cutler, C. and Gossan, S. and Nissanke, S. and Ott, C. D. and Thorne, K. S. and Vallisneri, M. (2015) Directed search for gravitational waves from Scorpius X-1 with initial LIGO data. Physical Review D, 91 (6). Art. No. 062008. ISSN 2470-0010. doi:10.1103/PhysRevD.91.062008. https://resolver.caltech.edu/CaltechAUTHORS:20150504-084613268
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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.
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| Additional Information: | © 2015 American Physical Society. Received 3 December 2014; published 26 March 2015. The authors gratefully acknowledge the support of the United States National Science Foundation (NSF) for the construction and operation of the LIGO Laboratory, the Science and Technology Facilities Council (STFC) of the United Kingdom, the Max-Planck-Society (MPS), and the State of Niedersachsen/Germany for support of the construction and operation of the GEO600 detector, the Italian Istituto Nazionale di Fisica Nucleare (INFN) and the French Centre National de la Recherche Scientifique (CNRS) for the construction and operation of the Virgo detector and the creation and support of the EGO consortium. The authors also gratefully acknowledge research support from these agencies as well as by the Australian Research Council, the International Science Linkages program of the Commonwealth of Australia, the Council of Scientific and Industrial Research of India, Department of Science and Technology, India, Science & Engineering Research Board (SERB), India, Ministry of Human Resource Development, India, the Spanish Ministerio de Economía y Competitividad, the Conselleria d’Economia i Competitivitat and Conselleria d’Educació, Cultura i Universitats of the Govern de les Illes Balears, the Foundation for Fundamental Research on Matter supported by the Netherlands Organisation for Scientific Research, the Polish Ministry of Science and Higher Education, the FOCUS Programme of Foundation for Polish Science, the European Union, the Royal Society, the Scottish Funding Council, the Scottish Universities Physics Alliance, the National Aeronautics and Space Administration, the Hungarian Scientific Research Fund (OTKA), the Lyon Institute of Origins (LIO), the National Research Foundation of Korea, Industry Canada and the Province of Ontario through the Ministry of Economic Development and Innovation, the National Science and Engineering Research Council Canada, the Brazilian Ministry of Science, Technology, and Innovation, the Carnegie Trust, the Leverhulme Trust, the David and Lucile Packard Foundation, the Research Corporation, and the Alfred P. Sloan Foundation. The authors gratefully acknowledge the support of the NSF, STFC, MPS, INFN, CNRS and the State of Niedersachsen/Germany for provision of computational resources. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Group: | LIGO, TAPIR | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Issue or Number: | 6 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Classification Code: | PACS: 95.85.Sz, 97.60.Jd, 97.80.Jp | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevD.91.062008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20150504-084613268 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150504-084613268 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Official Citation: | Directed search for gravitational waves from Scorpius X-1 with initial LIGO data J. Aasi et al. (LIGO Scientific Collaboration, Virgo Collaboration) Phys. Rev. D 91, 062008 (2015) – Published 26 March 2015 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ID Code: | 57179 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Deposited By: | Ruth Sustaita | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Deposited On: | 04 May 2015 16:58 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Last Modified: | 10 Nov 2021 21:09 |
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