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

Media type: Text; E-Article

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

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

imprint: Bristol : Institute of Physics Publishing, 2017

Issue: published Version

Language: English

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

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

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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.

Access State: Open Access

Rights information: Attribution (CC BY)

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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