Targeted large mass ratio numerical relativity surrogate waveform model for GW190814

Abstract

Gravitational wave observations of large mass ratio compact binary mergers like GW190814 highlight the need for reliable, high-accuracy waveform templates for such systems. We present NRHybSur2dq15, a new surrogate model trained on hybridized numerical relativity (NR) waveforms with mass ratios $q\le 15$, and aligned spins $|{\chi }_{1z}|\le 0.5$ and ${\chi }_{2z}=0$. We target the parameter space of GW190814-like events as large mass ratio NR simulations are very expensive. The model includes the (2,2), (2,1), (3,3), (4,4), and (5,5) spin-weighted spherical harmonic modes, and spans the entire LIGO bandwidth (with $f_{\mathrm{low}}=20$ Hz) for total masses $M\gtrsim 9.5M_{\odot }$. NRHybSur2dq15 accurately reproduces the hybrid waveforms, with mismatches below $\sim 2\times 10^{-3}$ for total masses $10M_{\odot }\le M\le 300M_{\odot }$. This is at least an order of magnitude improvement over existing semi-analytical models for GW190814-like systems. Finally, we reanalyze GW190814 with the new model and obtain source parameter constraints consistent with previous work.

arXiv comment14 pages, 9 figures; Accepted for publication in PRD

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