Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 750, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/750/1/L22
Keywords
magnetohydrodynamics (MHD); nuclear reactions, nucleosynthesis, abundances; stars: magnetic field; stars: neutron; stars: rotation
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Funding
- Swiss National Science Foundation (SNSF)
- Humboldt Foundation
- Helmholtz-University [VH-NG-825]
- European Science Foundation (ESF)
- European Commission
- Swiss National Supercomputing Centre (CSCS) [s332]
- FP7 ENSAR project
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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 similar to 0.15 to similar to 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 reproduced well. 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.
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