期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 906, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/abd256
关键词
Gravitational waves; Neutron stars; Low-mass x-ray binary stars
资金
- Max Planck Society
- State of Niedersachsen, Germany
- ERC [865768 AEONS]
- U.S. National Science Foundation
- French Centre National de Recherche Scientifique (CNRS)
- Italian Istituto Nazionale della Fisica Nucleare (INFN)
- Dutch Nikhef
Researchers conducted a search for continuous gravitational waves from a neutron star in the low-mass X-ray binary Scorpius X-1 using the LIGO O2 public data, achieving unprecedented sensitivity and excluding certain mass-radius combinations and magnetic field strengths. They corrected an error in the literature and reinterpreted the latest LIGO/Virgo results in light of their findings.
We present the results of a search in LIGO O2 public data for continuous gravitational waves from the neutron star in the low-mass X-ray binary Scorpius X-1. We search for signals with constant frequency in the range 40-180 Hz. Thanks to the efficiency of our search pipeline we can use a long coherence time and achieve unprecedented sensitivity, significantly improving on existing results. This is the first search that has been able to probe gravitational wave amplitudes that could balance the accretion torque at the neutron star radius. Our search excludes emission at this level between 67.5 and 131.5 Hz, for an inclination angle 44 degrees 6 degrees derived from radio observations, and assuming that the spin axis is perpendicular to the orbital plane. If the torque arm is 26 km-a conservative estimate of the Alfven radius-our results are more constraining than the indirect limit across the band. This allows us to exclude certain mass-radius combinations and to place upper limits on the strength of the star's magnetic field with a different probe than ever used before. We also correct a mistake that appears in the literature in the equation that gives the gravitational wave amplitude at the torque balance and we re-interpret the associated latest LIGO/Virgo results in light of this.
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