Searches for Continuous Gravitational Waves from Fifteen Supernova Remnants and Fomalhaut b with Advanced LIGO

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Abstract:: We describe directed searches for continuous gravitational waves from sixteen well localized candidate neutron stars assuming none of the stars has a binary companion. The searches were directed toward fifteen supernova remnants and Fomalhaut~b, an extrasolar planet candidate which has been suggested to be a nearby old neutron star. Each search covered a broad band of frequencies and first and second time derivatives. After coherently integrating spans of data from the first Advanced LIGO observing run of 3.5--53.7~days per search, applying data-based vetoes and discounting known instrumental artifacts, we found no astrophysical signals. We set upper limits on intrinsic gravitational wave strain as strict as \( 1\times10^{-25} \), on fiducial neutron star ellipticity as strict as \( 2\times10^{-9} \), and on fiducial \( r \)-mode amplitude as strict as \( 3\times10^{-8} \).

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Notes and Changes:: Updated following erratum.
Added data files for the figures. Due to detector calibration uncertainties and the statistical nature of the upper limits, these limits are much more uncertain than the precision of the numbers in the files. Caution is therefore advised in performing any direct comparison against the data values made available on this page. Repeated values in the second columns of all data files indicate bands where no upper limit was set, for reasons described in the text, and the (nonphysical) value in the second column was chosen for visibility in each plot.

LIGO Document P1800333-v7