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Can neutron star mergers alone explain the r-process enrichment of the Milky Way?
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Kobayashi, Chiaki, Mandel, Ilya, Belczynski, Krzysztof, Goriely, Stephane, Janka, Thomas H., Just, Oliver, Ruiter, Ashley J., Vanbeveren, Dany, Kruckow, Matthias U., Briel, Max M., Eldridge, Jan J. and Stanway, Elizabeth (2023) Can neutron star mergers alone explain the r-process enrichment of the Milky Way? The Astrophysical Journal Letters, 943 (2). L12. doi:10.3847/2041-8213/acad82 ISSN 2041-8205.
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Official URL: https://doi.org/10.3847/2041-8213/acad82
Abstract
Comparing Galactic chemical evolution models to the observed elemental abundances in the Milky Way, we show that neutron star mergers can be a leading r-process site only if at low metallicities such mergers have very short delay times and significant ejecta masses that are facilitated by the masses of the compact objects. Namely, black hole–neutron star mergers, depending on the black hole spins, can play an important role in the early chemical enrichment of the Milky Way. We also show that none of the binary population synthesis models used in this Letter, i.e., COMPAS, StarTrack, Brussels, ComBinE, and BPASS, can currently reproduce the elemental abundance observations. The predictions are problematic not only for neutron star mergers, but also for Type Ia supernovae, which may point to shortcomings in binary evolution models.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Neutron stars, Stellar mergers, Black holes (Astronomy), Fast neutrons -- Capture, Neutrons -- Capture, Cosmic abundances, Galaxies -- Evolution, Milky Way | |||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | The Astrophysical Journal Letters | |||||||||||||||||||||||||||||||||||||||
Publisher: | Institute of Physics Publishing, Inc. | |||||||||||||||||||||||||||||||||||||||
ISSN: | 2041-8205 | |||||||||||||||||||||||||||||||||||||||
Official Date: | 30 January 2023 | |||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 943 | |||||||||||||||||||||||||||||||||||||||
Number: | 2 | |||||||||||||||||||||||||||||||||||||||
Number of Pages: | 11 | |||||||||||||||||||||||||||||||||||||||
Article Number: | L12 | |||||||||||||||||||||||||||||||||||||||
DOI: | 10.3847/2041-8213/acad82 | |||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 8 March 2023 | |||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 9 March 2023 | |||||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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