Magnetic field effects on nucleosynthesis and kilonovae from neutron star merger remnants

Understand

We investigate the influence of parametric magnetic field configurations of a hypermassive neutron star (HMNS) on electromagnetic (EM) observables, specifically the kilonova lightcurves and nucleosynthesis yields.

• We perform three-dimensional (3D) dynamical-spacetime general-relativistic magnetohydrodynamic (GRMHD) simulations, including a neutrino leakage scheme, microphysical finite-temperature equation of state (EOS), and an initial poloidal magnetic field.
• We find that varying the magnetic field strength and falloff impacts the formation of magnetized winds or mildy-relativistic jets, which in turn has profound effects on the outflow properties.
• All of the evolved configurations collapse to a black hole (BH) $\sim 21-23$ ms after the onset of the simulations, however, the ones forming jets may be considerably more effective at transporting angular momentum out of the system, resulting in earlier collapse times.