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We perform high-resolution three-dimensional general-relativisticmagnetohydrodynamic simulations with neutrino transport of binary neutron star(BNS) mergers resulting in a long-lived remnant neutron star, with propertiestypical of galactic BNS and consistent with those inferred for the firstobserved BNS merger GW170817. We demonstrate self-consistently that within$\lesssim\!30$ ms post-merger magnetized ($\sigma\sim 5-10$) twin polar jetsemerge with asymptotic Lorentz factor $\Gamma\sim 5-10$, which successfullybreak out from the merger debris within $\lesssim\!20$ ms. A fast ($v\lesssim0.6c$), magnetized ($\sigma\sim 0.1$) wind surrounds the jet core and generatesa UV/blue kilonova precursor on timescales of hours, similar to the precursorsignal due to free neutron decay in fast dynamical ejecta. Post-merger ejectaare quickly dominated by MHD-driven outflows from an accretion disk. Wedemonstrate that within only 50 ms post-merger, $\gtrsim 2\times10^{-2}M_\odot$ of lanthanide-free, quasi-spherical ejecta with velocity$\sim\!0.1c$ is launched, yielding a kilonova signal consistent with GW170817on timescales of $\lesssim\!5$\,d.

Jets from neutron-star merger remnants and massive blue kilonovae