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The discovery of GW170817 with gravitational waves (GWs) and electromagnetic(EM) radiation is prompting new questions in strong-gravity astrophysics.Importantly, it remains unknown whether the progenitor of the merger comprisedtwo neutron stars (NSs), or a NS and a black hole (BH). Using newnumerical-relativity simulations and incorporating modeling uncertainties weproduce novel GW and EM observables for NS-BH mergers with similar masses. Ajoint analysis of GW and EM measurements reveals that if GW170817 is a NS-BHmerger, <40% of the binary parameters consistent with the GW data arecompatible with EM observations.

Distinguishing the nature of comparable-mass neutron star binary systems with multimessenger observations: GW170817 case study