Long-lived neutron stars from binary neutron star mergers.
The observation of 2-solar-mass neutron stars (NSs) in combination with the mass distribution in NS binaries (BNSs) suggests that many BNS mergers should form a long-lived NS rather than a black hole. Gravitational wave (GW) emission from this remnant NS offers a unique chance to constrain the NS equation of state (EOS). Moreover, the spindown-powered X-ray emission from long-lived NSs represents a very promising electromagnetic counterpart. We present recent GRMHD simulations of BNS mergers forming long-lived NS remnants, performed assuming different EOS and mass ratios. Results are discussed in the context of GW emission and electromagnetic counterparts.