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Metallicity-suppressed collapsars cannot be the dominant r-process source in the milky way

Fraser, J; Schönrich, R; (2022) Metallicity-suppressed collapsars cannot be the dominant r-process source in the milky way. Monthly Notices of the Royal Astronomical Society , 509 (4) pp. 6008-6027. 10.1093/mnras/stab3385. Green open access

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Abstract

We develop a high-performance analytical model of Galactic Chemical Evolution, which accounts for delay time distributions and lock-up of stellar yields in a thermal-phased ISM. The model is capable of searching, for the first time, through the high-dimensional parameter space associated with the r-process enrichment of the Milky Way by its possible sources: Neutron Star Mergers and Collapsar events. Their differing formation mechanisms give these two processes different time dependencies, a property which has frequently been used to argue in favour of collapsars as the dominant r-process source. However, we show that even with large degrees of freedom in the allowed thermal, structural, and chemical properties of the galaxy, large regions of parameter space are in strong tension with the data. In particular, whilst we are able to find models in which neutron star mergers produce the majority of r-process material, the data rule out all models with dominant collapsar yields. With no other identified source, we conclude that Neutron Star Mergers must be the dominant contributors to the modern Milky Way r-process budget.

Type: Article
Title: Metallicity-suppressed collapsars cannot be the dominant r-process source in the milky way
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab3385
Publisher version: https://doi.org/10.1093/mnras/stab3385
Language: English
Additional information: Copyright © The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: ISM: abundances, Galaxy: abundances, Galaxy: evolution, galaxies: ISM
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10140767
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