Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?

Abstract

We examine magnetorotationally driven supernovae as sources of $r$-process elements in the early Galaxy. On the basis of thermodynamic histories of tracer particles from a three-dimensional magnetohydrodynamical core-collapse supernova model with approximated neutrino transport, we perform nucleosynthesis calculations with and without considering the effects of neutrino absorption reactions on the electron fraction ($Y_e$) during post-processing. We find that the peak distribution of $Y_e$ in the ejecta is shifted from $\sim 0.15$ to $\sim 0.17$ and broadened toward higher $Y_e$ due to neutrino absorption. Nevertheless, in both cases the second and third peaks of the solar $r$-process element distribution can be well reproduced. The rare progenitor configuration that was used here, characterized by a high rotation rate and a large magnetic field necessary for the formation of bipolar jets, could naturally provide a site for the strong $r$-process in agreement with observations of the early galactic chemical evolution.

5 pages, 4 figures

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