Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios

The radiation of linear momentum imparts a recoil (or "kick") to the center mass merging black hole binary system. Recent numerical relativity calculations have shown that eccentricity can lead an approximate 25% increase in velocities for equal-mass, spinning binaries with spins lying orbital plane ("superkick" configurations) [U Sperhake et al. Phys. Rev. D 101 (2020) 024044 (arXiv:1910.01598)]. Here we investigate impact nonzero on kick magnitude and gravitational-wave emission nonspinning, unequal-mass binaries. We confirm eccentricities at merger kicks which are larger by up ~25% relative quasicircular case. also find velocity $v$ has oscillatory dependence eccentricity, interpret as consequence changes angle between infall direction apoapsis periapsis) direction.