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First searches for gravitational waves from r-modes of the Crab pulsar

Binod Rajbhandari, Benjamin J. Owen, Santiago Caride*, and Ra Inta†

  • Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas 79409-1051, USA

  • *Present address: Target Field, 1 Twins Way, Minneapolis, Minnesota 55403, USA.
  • †Present address: Accelebrate, 925B Peachtree Street, NE, PMB 378, Atlanta, Georgia 30309-3918, USA.
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Phys. Rev. D 104, 122008 – Published 29 December, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.122008

Abstract

We present the first searches for gravitational waves from r-modes of the Crab pulsar, coherently and separately integrating data from three stretches of the first two observing runs of Advanced LIGO using the F-statistic. The second run was divided in two by a glitch of the pulsar roughly halfway through. The frequencies and derivatives searched were based on radio measurements of the pulsar’s spin-down parameters as described in Caride et al., [Phys. Rev. D 100, 064013 (2019)]. We did not find any evidence of gravitational waves. Our best 90% confidence upper limits on gravitational wave intrinsic strain were 1.5×10−25 for the first run, 1.3×10−25 for the first stretch of the second run, and 1.1×10−25 for the second stretch of the second run. These are the first upper limits on gravitational waves from r-modes of a known pulsar to beat its spin-down limit, and they do so by more than an order of magnitude in amplitude or two orders of magnitude in luminosity.

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Phys. Rev. D 104, 122008– Published 29 December, 2021
  • Received 5 January 2021
  • Accepted 22 November 2021
Article part of CHORUS
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