Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data

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Titel: Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data

Beteiligte: Abbott, B.P. [VerfasserIn]; Adya, V.B. [VerfasserIn]; Affeldt, Christoph [VerfasserIn]; Allen, Bruce [VerfasserIn]; Ashton, G. [VerfasserIn]; Aufmuth, Peter [VerfasserIn]; Aulbert, C. [VerfasserIn]; Baune, C. [VerfasserIn]; Beer, C. [VerfasserIn]; Bergmann, G. [VerfasserIn]; Birnholtz, O. [VerfasserIn]; Bisht, A. [VerfasserIn]; Bock, O. [VerfasserIn]; Bode, N. [VerfasserIn]; Brinkmann, M. [VerfasserIn]; Cabero, M. [VerfasserIn]; Capano, C.D. [VerfasserIn]; Danilishin, S.L. [VerfasserIn]; Danzmann, Karsten [VerfasserIn]; Denker, T. [VerfasserIn]; Dent, T. [VerfasserIn]; Doravari, S. [VerfasserIn]; Drago, M. [VerfasserIn]; Eggenstein, H.-B. [VerfasserIn]; [...]

Erschienen: Bristol : Institute of Physics Publishing, 2017

Ausgabe: published Version

Sprache: Englisch

DOI: https://doi.org/10.15488/2581; https://doi.org/10.3847/1538-4357/aa86f0

Schlagwörter: gravitational waves ; accretion ; X-rays: binaries ; accretion disks ; Gravitationswelle ; stars: neutron

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Beschreibung: 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.

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Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data - [published Version]

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