Collapsars as a major source of r-process elements

@article{Siegel2019CollapsarsAA,
  title={Collapsars as a major source of r-process elements},
  author={Daniel M. Siegel and Jennifer Barnes and Brian D. Metzger},
  journal={Nature},
  year={2019},
  volume={569},
  pages={241-244}
}
The production of elements by rapid neutron capture (r-process) in neutron-star mergers is expected theoretically and is supported by multimessenger observations1–3 of gravitational-wave event GW170817: this production route is in principle sufficient to account for most of the r-process elements in the Universe4. Analysis of the kilonova that accompanied GW170817 identified5,6 delayed outflows from a remnant accretion disk formed around the newly born black hole7–10 as the dominant source of… 

Using failed supernovae to constrain the Galactic r-process element production

Rapid neutron capture process (r-process) elements have been detected in a large fraction of metal-poor halo stars, with abundances relative to iron (Fe) that vary by over two orders of magnitude.

Signatures of r-process Enrichment in Supernovae from Collapsars

Despite recent progress, the astrophysical channels responsible for rapid neutron capture (r-process) nucleosynthesis remain an unsettled question. Observations of the kilonova following the

Origin of the heaviest elements: The rapid neutron-capture process

The production of about half of the heavy elements found in nature is assigned to a specific astrophysical nucleosynthesis process: the rapid neutron capture process (r-process). Although this idea

Radio Constraints on r-process Nucleosynthesis by Collapsars

The heaviest elements in the universe are synthesized through rapid neutron capture (r-process) in extremely neutron-rich outflows. Neutron star mergers were established as an important r-process

GW170817 --the first observed neutron star merger and its kilonova: Implications for the astrophysical site of the r-process

  • D. Siegel
  • Physics
    The European Physical Journal A
  • 2019
Abstract.The first neutron star (NS) merger observed by advanced LIGO and Virgo, GW170817, and its fireworks of electromagnetic counterparts across the entire electromagnetic spectrum marked the

r-Process elements from magnetorotational hypernovae.

A large enhancement in r-process elements is observed in the extremely metal-poor star SMSS J200322, which indicates that similar explosions of fast-spinning strongly magnetized stars occurred during the earliest epochs of star formation in the authors' Galaxy.

Neutron star mergers and rare core-collapse supernovae as sources of r-process enrichment in simulated galaxies

We use cosmological, magnetohydrodynamical simulations of Milky Way-mass galaxies from the Auriga project to study their enrichment with rapid neutron capture (r-process) elements. We implement a

R-process enrichment in ultrafaint dwarf galaxies

We study the enrichment and mixing of r-process elements in ultrafaint dwarf galaxies (UFDs). We assume that r-process elements are produced by neutron-star mergers (NSMs), and examine multiple

R-process Rain from Binary Neutron Star Mergers in the Galactic Halo

Compact binary mergers involving at least one neutron star are promising sites for the synthesis of the r-process elements found in stars and planets. However, mergers can take place at significant
...

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