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Gravitational Wave Searches for Post-Merger Remnants of GW170817 and GW190425

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arxiv 2403.11392 v3 pith:UGSMSV3R submitted 2024-03-18 gr-qc

Gravitational Wave Searches for Post-Merger Remnants of GW170817 and GW190425

classification gr-qc
keywords gw190425searchesgw170817gravitationalneutrontextdetectionpost-merger
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present the results of two searches for gravitational waves from the post-merger remnants of the binary neutron star coalescence events GW170817 and GW190425. The searches are fully coherent over 1800~s of data from the 2nd (for GW170817) and 3rd (for GW190425) observing runs of the LIGO and Virgo observatories. The searches compute the matched filter $\mathcal{F}$-statistic, and use a piecewise model of the rapidly changing frequency evolution appropriate for young neutron stars. No detection is claimed. The peak root-sum-squared strain upper limit at 50\% detection probability ($h_{\text{rss}}^{50\%})$ of both searches occurs at 1700~Hz and is estimated at $1.64 \times 10^{-22}~\text{Hz}^{-1/2}$ for GW170817, and $1.0 \times 10^{-22}~\text{Hz}^{-1/2}$ for GW190425. This is the first gravitational wave search for a neutron star remnant of GW190425.

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