First search for gravitational waves from the youngest known neutron star

J. Abadie, N. A. Lockerbie, K. V. Tokmakov, LIGO Scientific Collaboration

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Abstract

We present a search for periodic gravitational waves from the neutron star in the supernova remnant Cassiopeia A. The search coherently analyzes data in a 12 day interval taken from the fifth science run of the Laser Interferometer Gravitational-Wave Observatory. It searches gravitational-wave frequencies from 100 to 300 Hz and covers a wide range of first and second frequency derivatives appropriate for the age of the remnant and for different spin-down mechanisms. No gravitational-wave signal was detected. Within the range of search frequencies, we set 95% confidence upper limits of (0.7-1.2) x 10(-24) on the intrinsic gravitational-wave strain, (0.4-4) x 10(-4) on the equatorial ellipticity of the neutron star, and 0.005-0.14 on the amplitude of r-mode oscillations of the neutron star. These direct upper limits beat indirect limits derived from energy conservation and enter the range of theoretical predictions involving crystalline exotic matter or runaway r-modes. This paper is also the first gravitational-wave search to present upper limits on the r-mode amplitude.
Original languageEnglish
Pages (from-to)1504-1513
Number of pages10
JournalAstrophysical Journal
Volume722
Issue number2
DOIs
Publication statusPublished - 20 Oct 2010

Keywords

  • gravitational waves
  • Cassiopeia A
  • stars
  • neutron
  • supernovae

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