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19 April 2024 |
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The Origin of r-Process Elements in the Milky Way | | Benoit Côté
; Chris L. Fryer
; Krzysztof Belczynski
; Oleg Korobkin
; Martyna Chruślińska
; Nicole Vassh
; Matthew R. Mumpower
; Jonas Lippuner
; Trevor M. Sprouse
; Rebecca Surman
; Ryan Wollaeger
; | | Date: |
16 Oct 2017 | | Abstract: | Some of the heavy elements, such as gold and europium (Eu), are almost
exclusively formed by the rapid neutron capture process (r-process). However,
it is still unclear which astrophysical site between core-collapse supernovae
and neutron star - neutron star (NS-NS) mergers produced most of the r-process
elements in the universe. Galactic chemical evolution (GCE) models can test
these scenarios by quantifying the frequency and yields required to reproduce
the amount of Eu observed in galaxies. Although NS-NS mergers have become
popular candidates, their required frequency (or rate) needs to be consistent
with that obtained from gravitational wave measurements. Here we address the
first NS-NS merger detected by LIGO/Virgo (GW170817) and its associated
Gamma-ray burst and analyze their implication on the origin of r-process
elements. Among other elements, we find that this event has produced between 15
and 70 Earth masses of gold. The range of NS-NS merger rate densities of
320$-$4740 Gpc$^{-3}$ yr$^{-1}$ provided by LIGO/Virgo is remarkably consistent
with the range required by GCE to explain the Eu abundances in the Milky Way
with NS-NS mergers, assuming a typical r-process abundance pattern for the
ejecta. When using theoretical calculations to derive Eu yields, constraining
the role of NS-NS mergers becomes more challenging because of nuclear
astrophysics uncertainties. This is the first study that directly combines
nuclear physics uncertainties with GCE calculations. If GW170817 is a
representative event, NS-NS mergers can produce Eu in sufficient amount and are
likely to be the main r-process site. | | Source: | arXiv, 1710.5875 | | Services: | Forum | Review | PDF | Favorites | |
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