Deep exploration for continuous gravitational waves at 171--172 Hz in LIGO second observing run data

Abstract

We pursue a novel strategy towards a first detection of continuous gravitational waves from rapidly-rotating deformed neutron stars. Computational power is focused on a narrow region of signal parameter space selected by a strategically-chosen benchmark. We search data from the 2nd observing run of the LIGO Observatory with an optimised analysis run on graphics processing units. While no continuous waves are detected, the search achieves a sensitivity to gravitational wave strain of $h_0=1.01\times 10^{-25}$ at 90% confidence, 24% to 69% better than past searches of the same parameter space. Constraints on neutron star deformity are within theoretical maxima, thus a detection by this search was not inconceivable.

arXiv comment8 pages, 4 figures; accepted for publication in Physical Review D; v2 corrects number of segments stated in Section IV

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