Nucleosynthesis in core-collapse supernova explosions triggered by a quark-hadron phase transition

Nobuya Nishimura, Tobias Fischer, Friedrich-Karl Thielemann, Carla Froehlich, Matthias Hempel, Roger Kaeppeli, Gabriel Martinez-Pinedo, T. Rauscher, Irina Sagert, Christian Winteler

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17 Citations (Scopus)
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Abstract

We explore heavy-element nucleosynthesis in the explosion of massive stars that are triggered by a quark-hadron phase transition during the early post-bounce phase of core-collapse supernovae. The present study is based on general-relativistic radiation hydrodynamics simulations with three-flavor Boltzmann neutrino transport in spherical symmetry, which utilize a quark-hadron hybrid equation of state based on the MIT bag model for strange quark matter. The quark-hadron phase transition inside the stellar core forms a shock wave propagating toward the surface of the proto-neutron star. This shock wave results in an explosion and ejects neutron-rich matter from the outer accreted layers of the proto-neutron star. Later, during the cooling phase, the proto-neutron star develops a proton-rich neutrino-driven wind. We present a detailed analysis of the nucleosynthesis outcome in both neutron-rich and proton-rich ejecta and compare our integrated nucleosynthesis with observations of the solar system and metal-poor stars. For our standard scenario, we find that a "weak" r-process occurs and elements up to the second peak (A similar to 130) are successfully synthesized. Furthermore, uncertainties in the explosion dynamics could barely allow us to obtain the strong r-process which produces heavier isotopes, including the third peak (A similar to 195) and actinide elements.

Original languageEnglish
Article number9
Number of pages13
JournalThe Astrophysical Journal
Volume758
Issue number1
DOIs
Publication statusPublished - 10 Oct 2012

Keywords

  • COMPACT STARS
  • MATTER
  • supernovae: general
  • R-PROCESS NUCLEOSYNTHESIS
  • MASSIVE STARS
  • STAR MERGERS
  • nuclear reactions, nucleosynthesis, abundances
  • HYDRODYNAMICS
  • EQUATION
  • stars: neutron
  • dense matter
  • EJECTA
  • NEUTRINO-DRIVEN WINDS
  • EVOLUTION

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