Searches for periodic gravitational waves from unknown isolated sources and Scorpius X-1: Results from the second LIGO science run

Searches for periodic gravitational waves from unknown isolated sources and Scorpius X-1: Results from the second LIGO science run. Abbott, B., Drever, R. W. P., Tinto, M., Brown, D. A., Cutler, C., Savov, P., Siemens, X., Thorne, K. S., Vallisneri, M., Abbott, R., Adhikari, R. X., Agresti, J., Anderson, S. B., Araya, M., Armandula, H., Ballmer, S., Barish, B. C., Bhawal, B., Billingsley, G., Black, E., Blackburn, K., Bork, R., Boschi, V., Busby, D., Cardenas, L., Cepeda, C., Chatterji, S., Coyne, D., Creighton, T. D., D'Ambrosio, E., DeSalvo, R., Ding, H., Dupuis, R. J., Ehrens, P., Espinoza, E., Etzel, T., Evans, M., Fairhurst, S., Fazi, D., Goggin, L. M., Heefner, J., Ivanov, A., Kells, W., Keppel, D. G., King, P., Kondrashov, V., Kozak, D., Lazzarini, A., Lei, M., Libbrecht, K., Lindquist, P., Logan, J., Mageswaran, M., Mailand, K., Mandic, V., Maros, E., Marx, J. N., Meshkov, S., Messaritaki, E., Meyers, D., Miyakawa, O., Nash, T., Nocera, F., Patel, P., Pedraza, M., Robertson, N. A., Russell, P., Samidi, M., Sanders, G. H., Sannibale, V., Sears, B., Smith, M. R., Sutton, P. J., Sylvestre, J., Takamori, A., Tarallo, M., Taylor, R., Tyler, W., Varvella, M., Vass, S., Villar, A., Waldman, S. J., Wallace, L., Ward, R., Webber, D., Weinstein, A. J., Whitcomb, S. E., Willems, P. A., Yamamoto, H., Zhang, L., & Zweizig, J. Physical Review D, 76(8):Art. No. 082001, American Physical Society, October, 2007. o̧pyright 2007 The American Physical Society. Received 12 June 2006. Revised 2 April 2007. Published 24 October 2007. The authors gratefully acknowledge the support of the United States National Science Foundation for the construction and operation of the LIGO Laboratory and the Particle Physics and Astronomy Research Council of the United Kingdom, the Max-Planck-Society, and the State of Niedersachsen/Germany for support of the construction and operation of the GEO600 detector. The authors also gratefully acknowledge the support of the research by these agencies and by the Australian Research Council, the Natural Sciences and Engineering Research Council of Canada, the Council of Scientific and Industrial Research of India, the Department of Science and Technology of India, the Spanish Ministerio de Educacion y Ciencia, The National Aeronautics and Space Administration, the John Simon Guggenheim Foundation, the Alexander von Humboldt Foundation, the Leverhulme Trust, the David and Lucile Packard Foundation, the Research Corporation, and the Alfred P. Sloan Foundation. This document has been assigned LIGO Laboratory Document No. LIGO-P050008.

Paper abstract bibtex

We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from the second LIGO science run. Both searches exploit fully coherent matched filtering and cover wide areas of parameter space, an innovation over previous analyses which requires considerable algorithm development and computational power. The first search is targeted at isolated, previously unknown neutron stars, covers the entire sky in the frequency band 160?728.8 Hz, and assumes a frequency derivative of less than 4$\times$10\^ (?10) Hz/s. The second search targets the accreting neutron star in the low-mass x-ray binary Scorpius X-1 and covers the frequency bands 464?484 Hz and 604?624 Hz as well as the two relevant binary orbit parameters. Because of the high computational cost of these searches we limit the analyses to the most sensitive 10 hours and 6 hours of data, respectively. Given the limited sensitivity and duration of the analyzed data set, we do not attempt deep follow-up studies. Rather we concentrate on demonstrating the data analysis method on a real data set and present our results as upper limits over large volumes of the parameter space. In order to achieve this, we look for coincidences in parameter space between the Livingston and Hanford 4-km interferometers. For isolated neutron stars our 95% confidence level upper limits on the gravitational wave strain amplitude range from 6.6$\times$10\^ (?23) to 1$\times$10\^ (?21) across the frequency band; for Scorpius X-1 they range from 1.7$\times$10\^ (?22) to 1.3$\times$10\^ (?21) across the two 20-Hz frequency bands. The upper limits presented in this paper are the first broadband wide parameter space upper limits on periodic gravitational waves from coherent search techniques. The methods developed here lay the foundations for upcoming hierarchical searches of more sensitive data which may detect astrophysical signals.

@article{caltechauthors44545,
          volume = {76},
          number = {8},
           month = {October},
          author = {B. Abbott and R. W. P. Drever and M. Tinto and D. A. Brown and C. Cutler and P. Savov and X. Siemens and K. S. Thorne and M. Vallisneri and R. Abbott and Rana X. Adhikari and J. Agresti and S. B. Anderson and M. Araya and H. Armandula and S. Ballmer and B. C. Barish and B. Bhawal and G. Billingsley and E. Black and K. Blackburn and R. Bork and V. Boschi and D. Busby and L. Cardenas and C. Cepeda and S. Chatterji and D. Coyne and T. D. Creighton and E. D'Ambrosio and R. DeSalvo and H. Ding and R. J. Dupuis and P. Ehrens and E. Espinoza and T. Etzel and M. Evans and S. Fairhurst and D. Fazi and L. M. Goggin and J. Heefner and A. Ivanov and W. Kells and D. G. Keppel and P. King and V. Kondrashov and D. Kozak and A. Lazzarini and M. Lei and K. Libbrecht and P. Lindquist and J. Logan and M. Mageswaran and K. Mailand and V. Mandic and E. Maros and J. N. Marx and S. Meshkov and E. Messaritaki and D. Meyers and O. Miyakawa and T. Nash and F. Nocera and P. Patel and M. Pedraza and N. A. Robertson and P. Russell and M. Samidi and G. H. Sanders and V. Sannibale and B. Sears and M. R. Smith and P. J. Sutton and J. Sylvestre and A. Takamori and M. Tarallo and R. Taylor and W. Tyler and M. Varvella and S. Vass and A. Villar and S. J. Waldman and L. Wallace and R. Ward and D. Webber and A. J. Weinstein and S. E. Whitcomb and P. A. Willems and H. Yamamoto and L. Zhang and J. Zweizig},
            note = {{\copyright} 2007 The American Physical Society. Received 12 June 2006. Revised 2 April 2007. Published 24 October 2007. The authors gratefully acknowledge the support of the United States National Science Foundation for the construction
and operation of the LIGO Laboratory and the Particle Physics and Astronomy Research Council of the United Kingdom, the Max-Planck-Society, and the State of
Niedersachsen/Germany for support of the construction
and operation of the GEO600 detector. The authors also
gratefully acknowledge the support of the research by these
agencies and by the Australian Research Council, the
Natural Sciences and Engineering Research Council of
Canada, the Council of Scientific and Industrial Research
of India, the Department of Science and Technology of
India, the Spanish Ministerio de Educacion y Ciencia, The
National Aeronautics and Space Administration, the John
Simon Guggenheim Foundation, the Alexander von
Humboldt Foundation, the Leverhulme Trust, the David
and Lucile Packard Foundation, the Research Corporation,
and the Alfred P. Sloan Foundation. This document has
been assigned LIGO Laboratory Document No. LIGO-P050008.},
           title = {Searches for periodic gravitational waves from unknown isolated sources and Scorpius X-1: Results from the second LIGO science run},
       publisher = {American Physical Society},
            year = {2007},
         journal = {Physical Review D},
           pages = {Art. No. 082001},
             url = {http://resolver.caltech.edu/CaltechAUTHORS:20140328-081826662},
        abstract = {We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from the second LIGO science run. Both searches exploit fully coherent matched filtering and cover wide areas of parameter space, an innovation over previous analyses which requires considerable algorithm development and computational power. The first search is targeted at isolated, previously unknown neutron stars, covers the entire sky in the frequency band 160?728.8 Hz, and assumes a frequency derivative of less than 4{$\times$}10{\^{ }}(?10)  Hz/s. The second search targets the accreting neutron star in the low-mass x-ray binary Scorpius X-1 and covers the frequency bands 464?484 Hz and 604?624 Hz as well as the two relevant binary orbit parameters. Because of the high computational cost of these searches we limit the analyses to the most sensitive 10 hours and 6 hours of data, respectively. Given the limited sensitivity and duration of the analyzed data set, we do not attempt deep follow-up studies. Rather we concentrate on demonstrating the data analysis method on a real data set and present our results as upper limits over large volumes of the parameter space. In order to achieve this, we look for coincidences in parameter space between the Livingston and Hanford 4-km interferometers. For isolated neutron stars our 95\% confidence level upper limits on the gravitational wave strain amplitude range from 6.6{$\times$}10{\^{ }}(?23) to 1{$\times$}10{\^{ }}(?21) across the frequency band; for Scorpius X-1 they range from 1.7{$\times$}10{\^{ }}(?22) to 1.3{$\times$}10{\^{ }}(?21) across the two 20-Hz frequency bands. The upper limits presented in this paper are the first broadband wide parameter space upper limits on periodic gravitational waves from coherent search techniques. The methods developed here lay the foundations for upcoming hierarchical searches of more sensitive data which may detect astrophysical signals.}
}

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