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  r-Process elements from magnetorotational hypernovae

Yong, D., Kobayashi, C., Costa, G. S. D., Bessell, M. S., Chiti, A., Frebel, A., et al. (2021). r-Process elements from magnetorotational hypernovae. Nature, 595, 223-226. doi:10.1038/s41586-021-03611-2.

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Yong, D., Author
Kobayashi, C., Author
Costa, G. S. Da, Author
Bessell, M. S., Author
Chiti, A., Author
Frebel, A., Author
Lind, K., Author
Mackey, A. D., Author
Nordlander, T., Author
Asplund, M.1, Author              
Casey, A. R., Author
Marino, A. F., Author
Murphy, S. J., Author
Schmidt, B. P., Author
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: Neutron-star mergers were recently confirmed as sites of rapid-neutron-capture (r-process) nucleosynthesis. 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 nucleosynthesis. 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 stars. 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 Universe. This connection indicates that similar explosions of fast-spinning strongly magnetized stars occurred during the earliest epochs of star formation in our Galaxy.

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Language(s): eng - English
 Dates: 2021-07-07
 Publication Status: Published online
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 Table of Contents: -
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 Identifiers: DOI: 10.1038/s41586-021-03611-2
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 595 Sequence Number: - Start / End Page: 223 - 226 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238