Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data
Name
Abbott_2017_ApJ_847_47.pdf
Size
1.88 MB
Format
Adobe PDF
Checksum (MD5)
bbdd51c062631617e9ec1f1cf5297d5e
Author(s)
Aggarwal, Nancy
Barsotti, Lisa
Biscans, Sebastien
Brown, N. M.
Buikema, Aaron
Donovan, Frederick J
Eisenstein, Robert Alan
Essick, Reed Clasey
Evans, Matthew J
Fernandez Galiana, Alvaro-Miguel
Date Issued
September 2017
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Abbott, B. P. et al. “Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-Based Cross-Correlation Search in Advanced LIGO Data.” The Astrophysical Journal 847, 1 (September 2017): 47 © 2017 The American Astronomical Society
Version
Final published version
Abstract
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 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 Hz, with comparable limits set across the most sensitive frequency range from 100 to 200 Hz. At this frequency, the 95% upper limit on the signal amplitude h 0 is 2.3 × 10 -25 marginalized over the unknown inclination angle of the neutron star's spin, and 8.0 × 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 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
LIGO (Observatory : Massachusetts Institute of Technology)
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Creative Commons Attribution 3.0 Unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3847/1538-4357/AA86F0
