Elements formation in radiation-hydrodynamics simulations of kilonovae
arxiv(2024)
摘要
Understanding the details of r-process nucleosynthesis in binary neutron
star mergers (BNSMs) ejecta is key to interpret kilonovae observations and to
identify the role of BNSMs in the origin of heavy elements. We present a
self-consistent 2-dimensional (ray-by-ray) radiation-hydrodynamic evolution of
BNSM ejecta with an online nuclear network (NN) up to the days timescale. For
the first time, an initial numerical-relativity ejecta profile composed of the
dynamical component, spiral-wave and disk winds is evolved including detailed
r-process reactions and nuclear heating effects. A simple model for the jet
energy deposition is also included. Our simulation highlights that the commonly
assumed approach of relating the final nucleosynthesis yields to the initial
thermodynamic profile of the ejecta can lead to inaccurate predictions. We also
find significant deviations (up to four orders of magnitudes) in the abundance
evolution of several analyzed elements compared to previous predictions
employing the NN in post-processing. The presence of a jet affects elements
production only in the innermost part of the polar ejecta, and it does not
alter the global nucleosynthesis results. Overall, our analysis shows that
employing an online NN is highly desiderable in order to obtain reliable
predictions of r-process nucleosynthesis and ejecta evolution.
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