r-Process Nucleosynthesis in Shocked Surface Layers of O-Ne-Mg Cores

Abstract

We demonstrate that rapid expansion of the shocked surface layers of an O-Ne-Mg core following its collapse can result in r-process nucleosynthesis. As the supernova shock accelerates through these layers, it makes them expand so rapidly that free nucleons remain in disequilibrium with alpha-particles throughout most of the expansion. This allows heavy r-process isotopes including the actinides to form in spite of the very low initial neutron excess of the matter. We estimate that yields of heavy r-process nuclei from this site may be sufficient to explain the Galactic inventory of these isotopes.

arXiv comment11 pages, 1 figure, to appear in the Astrophysical Journal Letters

References in corpus (15)

• Nucleosynthesis in neutrino-driven winds: I. The physical conditions
• Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae
• The Expulsion of Stellar Envelopes in Core-Collapse Supernovae
• The Extremely Metal-Poor, Neutron-Capture-Rich Star CS 22892-052: A Comprehensive Abundance Analysis
• The extreme r-element rich, iron-poor halo giant CS31082-001: Implications for the r-process site(s) and radioactive cosmochronology
• The Chemical Composition and Age of the Metal-Poor Halo Star BD +17^\circ 3248
• Where, oh where has the r-process gone?
• The r-Process Enriched Low Metallicity Giant HD 115444
• Near-UV Observations of HD221170: New Insights into the Nature of r-Process-Rich Stars
• Enrichment of the r-process Element Europium in the Galactic Halo
• The r-process in supernova explosions from the collapse of O-Ne-Mg cores
• R-Process in Collapsing O/Ne/Mg Cores
• Stellar Sources for Heavy r-Process Nuclei
• Determination of Nucleosynthetic Yields of Supernovae and Very Massive Stars from Abundances in Metal-Poor Stars
• Nucleosynthesis in Fast Expansions of High-Entropy, Proton Rich Matter

Cited by in corpus (33)

• Electron-capture supernovae as the origin of elements beyond iron
• Super and massive AGB stars - IV. Final fates - Initial to final mass relation
• The Status of Multi-Dimensional Core-Collapse Supernova Models
• Advanced burning stages and fate of 8-10 Mo stars
• Nucleosynthesis in the Innermost Ejecta of Neutrino-Drive Supernova Explosions in Two Dimensions
• Pre-galactic metal enrichment - The chemical signatures of the first stars
• Dynamics of shock propagation and nucleosynthesis conditions in O-Ne-Mg core supernovae
• Neutrino scattering and flavor transformation in supernovae
• Abundances of Sr, Y, and Zr in Metal-Poor Stars and Implications for Chemical Evolution in the Early Galaxy
• Flavor Evolution of the Neutronization Neutrino Burst from an O-Ne-Mg Core-Collapse Supernova
• Application of the RMF mass model to the r-process and the influence of mass uncertainties
• The r-process in the neutrino-driven wind from a black-hole torus
• Formation Of The Rare Earth Peak: Gaining Insight Into Late-Time r-Process Dynamics
• Astrophysical weak-interaction rates for selected $A=20$ and $A=24$ nuclei
• Potential Impact of Fast Flavor Oscillations on Neutrino-driven Winds and Their Nucleosynthesis
• The Influence Of Neutron Capture Rates On The Rare Earth Region Of The r-Process Abundance Pattern
• Neutron Capture Rates near A=130 which Effect a Global Change to the r-Process Abundance Distribution
• The Hobby-Eberly Telescope "Chemical Abundances of Stars in the Halo" (CASH) Project. I. The Lithium-, s-, and r-Enhanced Metal-Poor Giant HKII 17435-00532
• Impact of neutrino flavor oscillations on the neutrino-driven wind nucleosynthesis of an electron-capture supernova
• Reexamining the temperature and neutron density conditions for r-process nucleosynthesis with augmented nuclear mass models
• Nucleosynthesis in O-Ne-Mg Supernovae
• Neutrino oscillation signatures of oxygen-neon-magnesium supernovae
• Neutron capture on 130Sn during r-process freeze-out
• Nucleosynthesis of an $11.8M_{\odot }$ Supernova with 3D Simulation of the Inner Ejecta: Overall Yields and Implications for Short-Lived Radionuclides in the Early Solar System
• Hydrodynamic Simulations of Electron-capture Supernovae: Progenitor and Dimension Dependence
• Metallicity-Dependent Galactic Isotopic Decomposition for Nucleosynthesis
• Diverse, massive-star-associated sources for elements heavier than Fe and the roles of neutrinos
• Enrichment of the Galactic disc with neutron-capture elements: Gd, Dy, and Th
• The Formation of Electron-capture Supernovae: A Review
• Chemical Evolution of the Juvenile Universe
• Chemical Evolution of Heavy Elements in the Early Galaxy: Implications for Stellar Sources
• Mergers of binary neutron star systems: a multi-messenger revolution
• Impact of the nuclear mass uncertainties on the r process