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Over the last few years, there has been an increasing interest in sub-solarmass black holes due to their potential to provide valuable information aboutcosmology or the black hole population. Motivated by this, we study observablephenomena connected to the merger of a sub-solar mass black hole with a neutronstar. For this purpose, we perform new numerical-relativity simulations of abinary system composed of a black hole with mass $0.5M_\odot$ and a neutronstar with mass $1.4 M_\odot$. We investigate the merger dynamics of this exoticsystem and provide information about the connected gravitational-wave andkilonova signals. Our study indicates that current gravitational-waveformmodels are unable to adequately describe such systems and that phenomenologicalrelations connecting the binary parameters with the ejecta and remnantproperties are not applicable to our system. Furthermore, we find a dependenceof the kilonova signal on the azimuthal viewing angle due to the asymmetricmass ejection. This first-of-its-kind simulation opens the door for the studyof sub-solar mass black hole - neutron star mergers and could serve as atesting ground for future model development.

General-Relativistic Hydrodynamics Simulation of a Neutron Star - Sub-Solar-Mass Black Hole Merger