High-mass magnetized binary neutron star mergers and short gamma-ray bursts.
We present new fully general relativistic magnetohydrodynamic (GRMHD) simulations of the merger of high-mass binary neutron star (BNS) systems. We considered BNSs that produce an hypermassive neutron star that collapses to a spinning black hole (BH) surrounded by a magnetized accretion disk. We investigated whether such systems can launch relativistic jets and hence power short gamma-ray bursts. We considered the effects of different equations of state, different mass ratios, and different magnetic field orientations. For all cases we present a detailed study of the matter dynamics and of the magnetic field evolution, with particular attention to its global structure and possible emission of relativistic jets.