The r-Process in Supernova Explosions from the Collapse of O-Ne-Mg Cores

@article{Wanajo2003TheRI,
  title={The r-Process in Supernova Explosions from the Collapse of O-Ne-Mg Cores},
  author={Shinya Wanajo and Masaya Tamamura and Naoki Itoh and Ken’ichi Nomoto and Yuhri Ishimaru and Timothy C. Beers and Satoshi Nozawa},
  journal={The Astrophysical Journal},
  year={2003},
  volume={593},
  pages={968 - 979}
}
While the origin of r-process nuclei remains a long-standing mystery, recent spectroscopic studies of extremely metal poor stars in the Galactic halo strongly suggest that it is associated with core-collapse supernovae. In this study we examine r-process nucleosynthesis in a "prompt supernova explosion" from an 8-10 M☉ progenitor star as an alternative scenario to the "neutrino wind" mechanism, which has also been considered a promising site of the r-process. In the present model, the… 

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We present results of simulations of stellar collapse and explosions in spherical symmetry for progenitor stars in the 8–$10\,M_\odot$ range with an O-Ne-Mg core. The simulations were continued until

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Stellar abundance observations are providing important clues about the relationship between supernovae (SNe) and the rapid neutron capture process (i.e., the r-process). Although the site for the

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References

SHOWING 1-10 OF 78 REFERENCES

The r-Process in Neutrino-driven Winds from Nascent, “Compact” Neutron Stars of Core-Collapse Supernovae

We present calculations of r-process nucleosynthesis in neutrino-driven winds from the nascent neutron stars of core-collapse supernovae. A full dynamical reaction network for both the α-rich

Stellar Sources for Heavy r-Process Nuclei

The stellar sites and the complete mechanism of r-process nucleosynthesis are still unresolved issues. From consideration of the observed abundances in metal-poor stars, it is proposed that the

The r-process and neutrino-heated supernova ejecta

As a neutron star is formed by the collapse of the iron core of a massive star, its Kelvin-Helmholtz evolution is characterized by the release of gravitational binding energy as neutrinos. The

r-Process in Prompt Supernova Explosions Revisited

We reanalyze r-process nucleosynthesis in the neutron-rich ejecta from a prompt supernova explosion of a low-mass (11 M☉) progenitor. Although it has not yet been established that a prompt explosion

The Physics of Proto-Neutron Star Winds: Implications for r-Process Nucleosynthesis

We solve the general-relativistic steady-state eigenvalue problem of neutrino-driven proto-neutron star winds, which immediately follow core-collapse supernova explosions. We provide velocity,

What Can the Accretion-induced Collapse of White Dwarfs Really Explain?

The accretion-induced collapse (AIC) of a white dwarf into a neutron star has been invoked to explain gamma-ray bursts, Type Ia supernovae, and a number of problematic neutron star populations and

Core-Collapse Simulations of Rotating Stars

We present the results from a series of two-dimensional core-collapse simulations using a rotating progenitor star. We find that the convection in these simulations is less vigorous because (1)

First-generation black-hole-forming supernovae and the metal abundance pattern of a very iron-poor star

TLDR
It is inferred that the first-generation supernovae came mostly from explosions of ∼20–130 M[circdot] stars; some of these produced iron-poor but carbon- and oxygen-rich ejecta, and low-mass second-generation stars, like HE0107–5240, could form because the carbon and oxygen provided pathways for the gas to cool.

The r-Process in the Neutrino Winds of Core-Collapse Supernovae and U-Th Cosmochronology

The discovery of the second highly r-process-enhanced, extremely metal poor star, CS 31082-001 ([Fe/H] = -2.9) has provided a powerful new tool for age determination by virtue of the detection and

Neutrino-induced neutron spallation and supernova r -process nucleosynthesis

It is quite likely that the site of the r process is the hot, neutron-rich “bubble” that expands off a protoneutron star during a core-collapse supernova. The r process would then occur in an intense
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