https://doi.org/10.1051/epjconf/202022701009
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
* Corresponding author(s): waheed.m.akram@gmail.com., klk@uni-mainz.de
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
