Analysis of Ringdown Overtones in GW150914
arXiv:2201.00822 · doi:10.1103/PhysRevLett.129.111102
Abstract
We analyze GW150914 post-merger data to understand if ringdown overtone detection claims are robust. We find no evidence in favor of an overtone in the data after the waveform peak. Around the peak, the Bayes factor does not indicate the presence of an overtone, while the support for a nonzero amplitude is sensitive to changes in the starting time much smaller than the overtone damping time. This suggests that claims of an overtone detection are noise-dominated. We perform GW150914-like injections in neighboring segments of the real detector noise, and we show that noise can indeed induce artificial evidence for an overtone.
arXiv comment9 pages, 4 figures (including Supplemental Material). Version published in Physical Review Letters, featured in Physics and selected as Editors' Suggestion
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