r-Process elements from magnetorotational hypernovae

Journal
Date Issued
2021
Author(s)
Yong, D.
•
Kobayashi, C.
•
Da Costa, G. S.
•
Bessell, M. S.
•
Chiti, A.
•
Frebel, A.
•
Lind, K.
•
Mackey, A. D.
•
Nordlander, T.
•
Asplund, M.
•
Casey, A. R.
•
•
Murphy, S. J.
•
Schmidt, B. P.
DOI
Abstract
Neutron-star mergers were recently confirmed as sites of rapid-neutron-capture (r-process) nucleosynthesis1-3. However, in Galactic chemical evolution models, neutron-star mergers alone cannot reproduce the observed element abundance patterns of extremely metal-poor stars, which indicates the existence of other sites of r-process nucleosynthesis4-6. These sites may be investigated by studying the element abundance patterns of chemically primitive stars in the halo of the Milky Way, because these objects retain the nucleosynthetic signatures of the earliest generation of stars7-13. Here we report the element abundance pattern of the extremely metal-poor star SMSS J200322.54−114203.3. We observe a large enhancement in r-process elements, with very low overall metallicity. The element abundance pattern is well matched by the yields of a single 25-solar-mass magnetorotational hypernova. Such a hypernova could produce not only the r-process elements, but also light elements during stellar evolution, and iron-peak elements during explosive nuclear burning. Hypernovae are often associated with long-duration γ-ray bursts in the nearby Universe8. This connection indicates that similar explosions of fast-spinning strongly magnetized stars occurred during the earliest epochs of star formation in our Galaxy.
Volume
595
Issue
7866
Start page
223
Uri
Url
Issn Identifier
0028-0836
Ads BibCode
2021Natur.595..223Y
Rights
open.access
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