LIGO Document P1400182-v6

Searches for continuous gravitational waves from nine young supernova remnants

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We describe directed searches for continuous gravitational waves in data from the sixth LIGO science data run. The targets are nine young supernova remnants not associated with pulsars; eight of the remnants are associated with non-pulsing suspected neutron stars. One target's parameters were uncertain enough to warrant two searches, for a total of ten. Each search covered a broad band of frequencies and first and second frequency derivatives for a fixed sky direction. The searches coherently integrated data from the two LIGO interferometers over time spans from 5.3--25.3~days using the matched-filtering \( \mathcal{F} \)-statistic. We found no credible gravitational-wave signals. We set 95\% confidence upper limits as strong (low) as \( 4\times10^{-25} \) on intrinsic strain, \( 2\times10^{-7} \) on fiducial ellipticity, and
\( 3\times10^{-6} \) on \( r \)-mode amplitude. These beat the indirect limits from energy conservation and are within the
range of theoretical predictions for neutron-star ellipticities and \( r \)-mode amplitudes.
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Updated following erratum
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Published in ApJ vol. 813 pg. 39.

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