r-process Nucleosynthesis from Three-dimensional Magnetorotational Core-collapse Supernovae

We investigate r-process nucleosynthesis in 3D general-relativistic magnetohydrodynamic simulations of rapidly rotating strongly magnetized core collapse. The simulations include a microphysical finite-temperature equation of state and a leakage scheme that captures the overall energetics and lepton...

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Bibliographic Details
Published in:The Astrophysical journal 2018-09, Vol.864 (2), p.171
Main Authors: Mösta, Philipp, Roberts, Luke F., Halevi, Goni, Ott, Christian D., Lippuner, Jonas, Haas, Roland, Schnetter, Erik
Format: Article
Language:English
Subjects:
ASTRONOMY AND ASTROPHYSICS
Astrophysics
Collapse
Equations of state
Fluid flow
gamma-ray burst: general
gamma-ray burst: general instabilities magnetohydrodynamics neutrinos supernovae: general nucleosynthesis
instabilities
Leptons
Magnetic fields
Magnetohydrodynamic simulation
magnetohydrodynamics
magnetohydrodynamics (MHD)
Neutrinos
Nuclear fusion
Nuclear reactions
nuclear reactions, nucleosynthesis, abundances
nucleosynthesis
Rotation
Simulation
Supernovae
supernovae: general
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Summary:We investigate r-process nucleosynthesis in 3D general-relativistic magnetohydrodynamic simulations of rapidly rotating strongly magnetized core collapse. The simulations include a microphysical finite-temperature equation of state and a leakage scheme that captures the overall energetics and lepton number exchange due to postbounce neutrino emission and absorption. We track the composition of the ejected material using the nuclear reaction network SkyNet. Our results show that the 3D dynamics of magnetorotational core-collapse supernovae (CCSN) are important for their nucleosynthetic signature. We find that production of r-process material beyond the second peak is reduced by a factor of 100 when the magnetorotational jets produced by the rapidly rotating core undergo a kink instability. Our results indicate that 3D magnetorotationally powered CCSNe are robust r-process sources only if they are obtained by the collapse of cores with unrealistically large precollapse magnetic fields of the order of 1013 G. Additionally, a comparison simulation that we restrict to axisymmetry results in overly optimistic r-process production for lower magnetic field strengths.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/1538-4357/aad6ec