Results from high-frequency all-sky search for continuous gravitational waves from small-ellipticity sources

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Abstract

We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 1700-2000 Hz range from neutron stars with ellipticity of ≈10-8. The search employs the Falcon analysis pipeline [V. Dergachev and M. A. Papa, Phys. Rev. Lett. 123, 101101 (2019)PRLTAO0031-900710.1103/PhysRevLett.123.101101] on LIGO O2 public data. Our results improve by a factor greater than 5 over [B. P. Abbott (LIGO Scientific and Virgo Collaborations), Phys. Rev. D 100, 024004 (2019)PRVDAQ2470-001010.1103/PhysRevD.100.024004]. This is a huge leap forward: it takes an entirely new generation of gravitational wave detectors to achieve a 10-fold sensitivity increase over the previous generation [D. Reitze, Bull. Am. Astron. Soc. 51, 035 (2019)AASBAR0002-7537]. Within the probed frequency range and aside from the detected outliers, we can exclude neutron stars with ellipticity of 10-8 within 65 pc of Earth. We set upper limits on the gravitational wave amplitude that holds even for worst-case signal parameters. New outliers are found, some of which we are unable to associate with any instrumental cause. If any were associated with a rotating neutron star, this would likely be the fastest neutron star today.

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Dergachev, V., & Papa, M. A. (2021). Results from high-frequency all-sky search for continuous gravitational waves from small-ellipticity sources. Physical Review D, 103(6). https://doi.org/10.1103/PhysRevD.103.063019

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