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Modelling the gravitational wave signal from binaries beyond comparable massis an important open issue in gravitational wave astronomy. For non-spinningbinaries and when the spins are aligned with the orbital angular momentum, somefirst studies concerning the transition between the comparable and extreme massratio regime are already available, which suggest that extreme mass ratioresults at times extrapolate to comparable mass ratios with surprisingprecision. Here we study the case of misaligned spins: We present new NRsimulations performed with the Einstein Toolkit code at mass ratios up to 18and construct a heterogeneous dataset that spans all mass ratios, includingdata from NR simulations, numerical approximations to extreme mass ratiobinaries, and data from the geodesic approximation. As a first application weprovide fits for the remnant mass and spin magnitude in single spin precessingsystems, omitting consideration of the in-plane spin orientation. These fitsdemonstrate accuracy comparable to the state-of-the-art NRSur7dq4EmriRemnantmodel, all while retaining the simplicity and efficiency inherent in previousphenomenological fits.

Building a bridge between comparable and extreme mass ratio black hole binaries: a single spin precessing model for the final state