Nucleosynthesis of light trans-Fe isotopes in ccSNe: Implications from presolar SiC-X grains
1 Department of Earth Sciences,University of Oxford, Oxford OX1 3AN, UK
2 Department of Chemistry,Pharmacy & Geosciences,Univ. Mainz, D-55128 Mainz, Germany
3 Max-Planck Institute for Chemistry, Otto-Hahn Institute, D-55020 Mainz, Germany
Published online: 14 January 2020
This contribution presents an extension of our r-process parameter study within the high-entropy-wind (HEW) scenario of corecollapse supernovae (ccSNe). One of the primary aims of this study was to obtain indications for the production of classical p-, s- and r-isotopes of the light trans-Fe elements in the Solar System (S.S.). Here, we focus on the nucleosynthesis origin of the anomalous isotopic compositions of Zr, Mo and Ru in presolar SiC X-grains (SNe grains). In contrast to the interpretation of other groups, we show that these grains do not represent the signatures of a ‘clean’ stellar scenario, but rather, are mixtures of an exotic nucleosynthesis component and S.S. material. We further confirm the results of our earlier studies whereby sizeable amounts of all stable p-, s- and r-isotopes of Zr, Mo and Ru can be co-produced by moderately neutron-rich ejecta of the low-entropy, charged-particle scenario of ccSNe (type II). The synthesis of these isotopes through a ‘primary’ production mode provides further means to revise the abundance estimates of the light trans-Fe elements from so far favoured ‘secondary’ scenarios like Type Ia SNe or neutron-bursts in exploding massive stars.
© The Authors, published by EDP Sciences, 2020
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