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Black hole-neutron star (BHNS) mergers are one of the most promising targetsfor multimessenger astronomy. Using general relativistic magnetohydrodynamicsimulations of BHNS undergoing merger we showed that a magnetically--driven jetcan be launched by the remnant if the NS is endowed with a dipole B fieldextending from the interior into the exterior as in a radio pulsar. Theseself-consistent studies considered a BHNS system with mass ratio $q=3:1$, BHspin $a/M_{BH}=0.75$ aligned with the total orbital angular momentum (OAM), anda NS that is irrotational, threaded by an aligned B field, and modeled by an$\Gamma$--law equation of state with $\Gamma=2$. Here, as a crucial step inestablishing BHNS systems as viable progenitors of central engines that powershort gamma--ray bursts (sGRBs) and thereby solidify their role asmultimessenger sources, we survey different BHNS configurations that differ inBH spin ($a/M_{BH} =-0.5,\,0,\,0.5,\,0.75$), in the mass ratio ($q=3:1$ and$q=5:1$), and in the orientation of the B field (aligned and tilted by$90^\circ$ with respect to the OAM). We find that by $\Delta t\sim 3500M-4000M\sim 88(M_{NS}/1.4M_\odot){\rm ms}-100(M_{NS}/1.4M_\odot)\rm ms$ after the peakgravitational wave signal a jet is launched in the cases where the initial BHspin is $a/M_{BH}= 0.5$ or $0.75$. The lifetime of the jets[$\Delta t\sim0.5(M_{NS}/1.4M_\odot){\rm s-0.7}(M_{NS}/1.4M_\odot)\rm s$] and their Poyntingluminosities [$L_{jet}\sim 10^{51\pm 1}\rm erg/s$] are consistent with sGRBs,as well as with the Blandford--Znajek mechanism. By the time we terminate oursimulations, we do not observe either an outflow or a large-scale B fieldcollimation in the other configurations we simulate. These results suggest thatfuture multimessenger detections from BHNSs are more likely produced bybinaries with highly spinning BH companions and small tilt-angle B fields.

Jet launching from binary black hole-neutron star mergers: Dependence on black hole spin, binary mass ratio and magnetic field orientation