Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data
Creators: name: Abbott, B.P.
name: Adya, V.B.
name: Affeldt, Christoph
name: Allen, Bruce
name: Ashton, G.
name: Aufmuth, Peter
name: Aulbert, C.
name: Baune, C.
name: Beer, C.
name: Bergmann, G.
name: Birnholtz, O.
name: Bisht, A.
name: Bock, O.
name: Bode, N.
name: Brinkmann, M.
name: Cabero, M.
name: Capano, C.D.
name: Danilishin, S.L.
name: Danzmann, Karsten
name: Denker, T.
name: Dent, T.
name: Doravari, S.
name: Drago, M.
name: Eggenstein, H.-B.
name: Fehrmann, H.
name: Gabbard, H.
name: Goetz, E.
name: Grote, H.
name: Hanke, M.M.
name: Heurs, M.
name: Hu, Y.M.
name: Indik, N.
name: Junker, J.
name: Karvinen, K.S.
name: Kaufer, S.
name: Khan, S.
name: Kirchhoff, R.
name: Koch, P.
name: Koehlenbeck, S.M.
name: Krämer, C.
name: Kringel, V.
name: Krishnan, B.
name: Kuehn, G.
name: Lehmann, J.
name: Lough, J.D.
name: Lück, Harald
name: Lundgren, A.P.
name: Machenschalk, Bernd
name: Meadors, G.D.
name: Mukherjee, A.
name: Nery, M.
name: Nielsen, A.B.
name: Nitz, A.
name: Noack, A.
name: Ohme, F.
name: Oppermann, P.
name: Papa, M.A.
name: Post, A.
name: Prijatelj, M.
name: Prix, R.
name: Puncken, O.
name: Rüdiger, A.
name: Salemi, F.
name: Schmidt, J.
name: Schreiber, E.
name: Schuette, D.
name: Schulte, B.W.
name: Schutz, B.F.
name: Singh, A.
name: Steinke, M.
name: Steinmeyer, D.
name: Theeg, T.
name: Vahlbruch, H.
name: Wei, L.-W.
name: Weinert, M.
name: Wessels, P.
name: Westphal, T.
name: Wette, K.
name: Willke, B.
name: Wimmer, M.H.
name: Winkler, W.
name: Wittel, H.
name: Woehler, J.
name: Wu, D.S.
name: Et Al.
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2017
Subjects: subject: accretion
subject: accretion disks
subject: gravitational waves
subject: stars: neutron
subject: X-rays: binaries
subject: Gravitationswelle
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: 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–$2000\,\mathrm{Hz}$, 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 $175\,\mathrm{Hz}$, with comparable limits set across the most sensitive frequency range from 100 to $200\,\mathrm{Hz}$. At this frequency, the 95% upper limit on the signal amplitude h 0 is $2.3\times {10}^{-25}$ marginalized over the unknown inclination angle of the neutron star's spin, and $8.0\times {10}^{-26}$ 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 $100\,\mathrm{Hz}$, 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.