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Reports upper limits on periodic gravitational wave signals from neutron stars, suggesting new insights into cosmic phenomena.
We report on a new all-sky search for periodic gravitational waves in the frequency band 475--2000 Hz and with a frequency time derivative in the range of [-1.0,+0.1]×10^-8 Hz/s. Potential signals could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the data from Advanced LIGO's first observational run O1. No gravitational-wave signals were observed, and upper limits were placed on their strengths. For completeness, results from the separately published low-frequency search 20--475 Hz are included as well. Our lowest upper limit on worst-case (linearly polarized) strain amplitude h₀ is ~4×10^-25 near 170 Hz, while at the high end of our frequency range, we achieve a worst-case upper limit of 1.3×10^-24. For a circularly polarized source (most favorable orientation), the smallest upper limit obtained is ~1.5×10^-25.
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Abbott et al. (2018) studied this question.
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