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Search for continuous gravitational waves from small-ellipticity sources at low frequencies

Vladimir Dergachev1,2,* and Maria Alessandra Papa1,2,3,†

  • 1Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Callinstrasse 38, 30167 Hannover, Germany
  • 2Leibniz Universität Hannover, D-30167 Hannover, Germany
  • 3University of Wisconsin Milwaukee, 3135 N Maryland Avenue, Milwaukee, Wisconsin 53211, USA

  • *vladimir.dergachev@aei.mpg.de
  • †maria.alessandra.papa@aei.mpg.de
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Phys. Rev. D 104, 043003 – Published 3 August, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.043003

Abstract

We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 20–500 Hz range from neutron stars with ellipticity of ≈10−8. This frequency region is particularly hard to probe because of the quadratic dependence of signal strength on frequency. The search employs the Falcon analysis pipeline [Dergachev and Papa, Phys. Rev. Lett. 123, 101101 (2019)] on LIGO O2 public data. Compared to previous Falcon analyses the coherence length has been quadrupled, with a corresponding increase in sensitivity. This enables us to search for small-ellipticity neutron stars in this low frequency region up to 44 pc away. The frequency derivative range is up to 3×10−13  Hz/s easily accommodating sources with ellipticities of 10−7 at a distance of a few hundred parsecs. New outliers are found, many of which we are unable to associate with any instrumental cause.

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Phys. Rev. D 104, 043003– Published 3 August, 2021
  • Received 29 April 2021
  • Accepted 28 June 2021
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