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Magneto-rotationally driven Supernovae as the origin of early galaxy r-process elements?

by C. Winteler and R. Käppeli and A. Perego and A. Arcones and N. Vasset and N. Nishimura and M. Liebendörfer and F.-K. Thielemann

(Report number 2012-05)

Abstract
We examine magneto-rotationally driven supernovae as sources of r-process elements in the early Galaxy. On the basis of thermodynamic histories of tracer particles from a 3D 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 (Ye) during post-processing. We find that the peak distribution of Ye in the ejecta is shifted from ~ 0.15 to ~ 0.17 and broadened towards higher Ye due to neutrino absorption. Nevertheless, in both cases the second and third peak 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.

Keywords:

@Techreport{WKPAVNLT12_447,
  author = {C. Winteler and R. K\"appeli and A. Perego and A. Arcones and N. Vasset and N. Nishimura and M. Liebend\"orfer and F.-K. Thielemann},
  title = {Magneto-rotationally driven Supernovae as the origin of early galaxy r-process elements?},
  institution = {Seminar for Applied Mathematics, ETH Z{\"u}rich},
  number = {2012-05},
  address = {Switzerland},
  url = {https://www.sam.math.ethz.ch/sam_reports/reports_final/reports2012/2012-05.pdf },
  year = {2012}
}

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