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Ackley, K.; Agatsuma, K.; Areeda, J. S.; Aufmuth, P.; Bae, S.; Batch, J. C.; Bertolini, A.; Bondu, F.; Bonnand, R.; Bork, R.; Bose, S.; Bozzi, A.; Bulten, H. J.; Capocasa, E.; Chan, M.; Cho, M.; Chow, J. H.; Chua, A. J. K.; Clark, J. A.; Conti, L.; Corsi, A.; Coulon, J.-P.; Countryman, S. T.; Dal Canton, T.; Dálya, G.; Díaz, M. C.; Doravari, S.; Dreissigacker, C.; Dwyer, S. E.; Evans, T. M.; Fiori, I.; Font, J. A.; Fyffe, M.; Gennai, A.; George, J.; Ghosh, Abhirup; Ghosh, Archisman; Goetz, R.; Haney, M.; Hanke, M. M.; Hello, P.; Hemming, G.; Holt, K.; Houston, E. A.; Hreibi, A.; Indik, N.; Intini, G.; Isi, M.; Jaranowski, P.; Kamai, B.; Kent, C.; Kimbrell, S. J.; King, E. J.; Kontos, A.; Kringel, V.; Lazzarini, A.; Liu, J.; Lorenzini, M.; Markakis, C.; Martellini, L.; McCarthy, R.; Mercer, R. A.; Messick, C.; Mitra, S.; Mogushi, K.; Morriss, S. R.; Nelemans, G.; Nuttall, L. K.; Oppermann, P.; O’Reilly, B.; Ortega, L. F.; Pan, Howard; Pan, Huang-Wei; Pankow, C.; Paoletti, F.; Parida, A.; Pedraza, M.; Perreca, A.; Prodi, G. A.; Rabeling, D. S.; Rakhmanov, M.; Ryan, K.; Sanchez, E. J.; Sanchez, L. E.; Sauter, O.; Sequino, V.; Shahriar, M. S.; Talukder, D.; Theeg, T.; Toland, K.; Tsukada, L.; Tsuna, D.; Urban, A. L.; Vitale, S.; Wallace, L.; Westphal, T.; Wette, K.; Whiting, B. F.; Winkler, W.; Wysocki, D. M.
Physical review. D, 12/2017, Volume: 96, Issue: 12Journal Article
Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for ground-based interferometric detectors. In the case of known pulsars a fully coherent search, based on matched filtering, which uses the position and rotational parameters obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signal-to-noise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch between the assumed and the true signal parameters. For this reason, narrow-band analysis methods have been developed, allowing a fully coherent search for gravitational waves from known pulsars over a fraction of a hertz and several spin-down values. In this paper we describe a narrow-band search of 11 pulsars using data from Advanced LIGO’s first observing run. Although we have found several initial outliers, further studies show no significant evidence for the presence of a gravitational wave signal. Finally, we have placed upper limits on the signal strain amplitude lower than the spin-down limit for 5 of the 11 targets over the bands searched; in the case of J1813-1749 the spin-down limit has been beaten for the first time. For an additional 3 targets, the median upper limit across the search bands is below the spin-down limit. This is the most sensitive narrow-band search for continuous gravitational waves carried out so far.
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