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The 2017 detection of the inspiral and merger of two neutron stars ingravitational waves and gamma rays was accompanied by a quickly-reddeningtransient. Such a transient was predicted to occur following a rapid neutroncapture (r-process) nucleosynthesis event, which synthesizes neutron-rich,radioactive nuclei and can take place in both dynamical ejecta and in the winddriven off the accretion torus formed after a neutron star merger. We presentthe first three-dimensional general relativistic, full transport neutrinoradiation magnetohydrodynamics (GRRMHD) simulations of the black hole-accretiondisk-wind system produced by the GW170817 merger. We show that the small butnon-negligible optical depths lead to neutrino transport globally coupling thedisk electron fraction, which we capture by solving the transport equation witha Monte Carlo method. The resulting absorption drives up the electron fractionin a structured, continuous outflow, with electron fraction as high as $Y_e\sim0.4$ in the extreme polar region. We show via nuclear reaction network andradiative transfer calculations that nucleosynthesis in the disk wind willproduce a blue kilonova.

Full Transport Model of GW170817-Like Disk Produces a Blue Kilonova