We have analyzed LVK gravitational wave events that show some evidence of eccentricity from TEOBResumS modeling parameter estimations and have confronted them independently with full numerical generated waveforms from our bank of nearly two thousand simulations of binary black holes. We have used RIFT for Bayesian parameter estimation and found that GW200208_22 KDE estimates favor eccentricities e20=0.198−0.180+0.119 upon entering the LVK band at ∼20Hz within a 90% confidence interval. Within this event analysis we employed 42 new targeted full numerical relativity simulations and we have thus found a top improved likelihood lnL matching waveform, compared to model-based analysis, with an estimated eccentricity at 20Hz, e20=0.200, thus reinforcing the eccentric hypothesis of the binary. We have also used our full bank of numerical waveforms on GW190620 finding that the KDE estimate favors eccentricities at 10 Hz in e10=0.190−0.186+0.046. New specifically targeted simulations will be required to narrow these eccentricity ranges.
@article{arxiv.2507.22862,
title = {Parameter Estimation with Targeted Eccentric Numerical-Relativity Simulations for GW200208_22 and GW190620},
author = {Patricia McMillin and Katelyn J. Wagner and Giuseppe Ficarra and Carlos O. Lousto and Richard O'Shaughnessy},
journal= {arXiv preprint arXiv:2507.22862},
year = {2026}
}