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MAGNETOROTATIONALLY DRIVEN SUPERNOVAE AS THE ORIGIN OF EARLY GALAXY r -PROCESS ELEMENTS?

2012; IOP Publishing; Volume: 750; Issue: 1 Linguagem: Inglês

10.1088/2041-8205/750/1/l22

2041-8213

C. Winteler, Roger Käppeli, Albino Perego, Almudena Arcones, Nicolas Vasset, Nobuya Nishimura, M. Liebendörfer, F.‐K. Thielemann,

Nuclear physics research studies

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 (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 toward higher Ye 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.