期刊
ASTROPHYSICAL JOURNAL
卷 882, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab384e
关键词
nuclear reactions, nucleosynthesis; abundances; stars: evolution; Sun: abundances; supernovae: general
资金
- ChETEC COST Action [CA16117]
- HITS gGmbH
- ERC [724560]
- National Science Foundation (NSF, USA) [PHY-1430152]
- Klaus Tschira Foundation
- Collaborative Research Center The Milky Way System of the German Research Foundation (DFG) [SFB 881]
- US Department of Energy LDRD program through the Los Alamos National Laboratory
- National Nuclear Security Administration of U.S. Department of Energy [89233218NCA000001]
- European Research Council (ERC) [724560] Funding Source: European Research Council (ERC)
We examine the contribution of electron-capture supernovae (ECSNe), low-mass SNe from collapsing Fe cores (FeCCSNe), and rotating massive stars to the chemical composition of the Galaxy. Our model includes contributions to chemical evolution from both thermonuclear ECSNe (tECSNe) and gravitational collapse ECSNe (cECSNe). We show that if ECSNe are predominantly gravitational collapse SNe but about 15% are partial thermonuclear explosions, the model is able to reproduce the solar abundances of several important and problematic isotopes including Ca-48, Ti-50, and Cr-54 together with Fe-58, Ni-64, Se-82, and Kr-86 and several of the Zn- Zr isotopes. A model in which no cECSNe occur, only tECSNe with low-mass FeCCSNe or rotating massive stars, proves also very successful at reproducing the solar abundances for these isotopes. Despite the small mass range for the progenitors of ECSNe and low-mass FeCCSNe, the large production factors suffice for the solar inventory of the above isotopes. Our model is compelling because it introduces no new tensions with the solar abundance distribution for a Milky Way model-only tending to improve the model predictions for several isotopes. The proposed astrophysical production model thus provides a natural and elegant way to explain one of the last uncharted territories on the periodic table of astrophysical element production.
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