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Van Putten & Della Valle (2018) have reported a possible detection ofgravitational-wave 'extended emission' from a neutron star remnant of GW170817.Starting from the time-frequency evolution and total emitted energy of theirreported candidate, we show that such an emission is not compatible with thecurrent understanding of neutron stars. We explore the additional requiredphysical assumptions to make a full waveform model, for example, taking theoptimistic emission from a spining-down neutron star with fixed quadrupolardeformation, and study whether even an ideal single-template matched-filteranalysis could detect an ideal, fully phase-coherent signal. We find that evenin the most optimistic case an increase in energy and extreme parameters wouldbe required for a confident detection with LIGO sensitivity as of 2018-08-17.The argument also holds for other waveform models following a similartime-frequency track and overall energy budget. Single-template matchedfiltering on the LIGO data around GW170817, and on data with added simulatedsignals, verifies the expected sensitivity scaling and the overall statisticalexpectation.

Matched-filter study and energy budget suggest no detectable gravitational-wave 'extended emission' from GW170817