Comparing Remnant Properties from Horizon Data and Asymptotic Data in Numerical Relativity

We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass, spin, and recoil velocity of each remnant were computed locally from apparent horizon data and asymptotically from the Bondi data $(h, \psi_4, \psi_3, \psi_2, \psi_1)$ made available at future null infinity with a Cauchy characteristic evolution. We compare these two independent measurements of the remnant properties, giving insight into how well asymptotic waveforms reveal local information of the remnant black hole in numerical relativity. This study highlights the importance of fixing the BMS frame of numerically determined waveforms.