Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?

Abstract

We examine magnetorotationally driven supernovae as sources of $r$-process elements in the early Galaxy. On the basis of thermodynamic histories of tracer particles from a three-dimensional magnetohydrodynamical core-collapse supernova model with approximated neutrino transport, we perform nucleosynthesis calculations with and without considering the effects of neutrino absorption reactions on the electron fraction ($Y_e$) during post-processing. We find that the peak distribution of $Y_e$ in the ejecta is shifted from $\sim 0.15$ to $\sim 0.17$ and broadened toward higher $Y_e$ due to neutrino absorption. Nevertheless, in both cases the second and third peaks of the solar $r$-process element distribution can be well reproduced. The rare progenitor configuration that was used here, characterized by a high rotation rate and a large magnetic field necessary for the formation of bipolar jets, could naturally provide a site for the strong $r$-process in agreement with observations of the early galactic chemical evolution.

arXiv comment5 pages, 4 figures

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• The impact of rare events on the chemical enrichment in dwarf galaxies
• A Broad Grid of 2D Kilonova Emission Models
• MRI-driven $\alpha \Omega$ dynamo at high Pm numbers
• Natural superheavy nuclei in astrophysical data
• FRIB and the GW170817 Kilonova
• Th/Eu abundance ratio of red giants in the Kepler Field
• Heavy Elements -- They came out of the blue
• Convection signatures in early-time gravitational waves from core-collapse supernovae
• 3D Synthetic Convective Velocity Fields to Initialise Core-Collapse Supernova Simulations from 1D Progenitors
• The CUBES Science Case
• Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. IV. Heavy Element Enhanced Stars
• The Origins of Neutron-capture Elements In Globular Cluster M22
• The COMBS Survey -- III. The Chemodynamical Origins of Metal-Poor Bulge Stars
• The nearby He-rich superluminous supernova SN 2021bnw during photospheric phases
• Two Sites of r-Process Production Assessed on the Basis of the Age-tagged Abundances of Solar Twins
• UVES analysis of red giants in the bulge globular cluster NGC 6522