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Numerical relativity (NR) simulations provide the most accurate binary blackhole gravitational waveforms, but are prohibitively expensive for applicationssuch as parameter estimation. Surrogate models of NR waveforms have been shownto be both fast and accurate. However, NR-based surrogate models are limited bythe training waveforms' length, which is typically about 20 orbits beforemerger. We remedy this by hybridizing the NR waveforms using bothpost-Newtonian and effective one body waveforms for the early inspiral. Wepresent NRHybSur3dq8, a surrogate model for hybridized nonprecessing numericalrelativity waveforms, that is valid for the entire LIGO band (starting at$20~\text{Hz}$) for stellar mass binaries with total masses as low as$2.25\,M_{\odot}$. We include the $\ell \leq 4$ and $(5,5)$ spin-weightedspherical harmonic modes but not the $(4,1)$ or $(4,0)$ modes. This model hasbeen trained against hybridized waveforms based on 104 NR waveforms with massratios $q\leq8$, and $|\chi_{1z}|,|\chi_{2z}| \leq 0.8$, where $\chi_{1z}$($\chi_{2z}$) is the spin of the heavier (lighter) BH in the direction oforbital angular momentum. The surrogate reproduces the hybrid waveformsaccurately, with mismatches $\lesssim 3\times10^{-4}$ over the mass range$2.25M_{\odot} \leq M \leq 300 M_{\odot}$. At high masses($M\gtrsim40M_{\odot}$), where the merger and ringdown are more prominent, weshow roughly two orders of magnitude improvement over existing waveform models.We also show that the surrogate works well even when extrapolated outside itstraining parameter space range, including at spins as large as 0.998. Finally,we show that this model accurately reproduces the spheroidal-spherical modemixing present in the NR ringdown signal.

Surrogate model of hybridized numerical relativity binary black hole waveforms