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Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data by Yuanhao Zhang; Maria Alessandra Papa; Badri Krishnan; Anna L. Watts is a Physics and Astronomy article available to read on EtoBox.
What is Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data about?
Abstract 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° ± 6° 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 Alfvén 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 amplit
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- Author
- Yuanhao Zhang; Maria Alessandra Papa; Badri Krishnan; Anna L. Watts
- Published
- 2021
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)