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Abstract

Neutrino interactions are essential for an accurate understanding of the
binary neutron star merger process. In this article, we extend the code
infrastructure of the well-established numerical-relativity code BAM that until
recently neglected neutrino-driven interactions. In fact, while previous work
allowed already the usage of nuclear-tabulated equations of state and employing
a neutrino leakage scheme, we are moving forward by implementing a first-order
multipolar radiation transport scheme (M1) for the advection of neutrinos.
After testing our implementation on a set of standard scenarios, we apply it to
the evolution of four low-mass binary systems, and we perform an analysis of
ejecta properties. We also show that our new ejecta analysis infrastructure is
able to provide numerical relativity-informed inputs for the codes
$\texttt{POSSIS}$ and $\texttt{Skynet}$, for the computation of kilonova
lightcurves and nucleosynthesis yields, respectively.