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

Philipp MöstaDepartment of Astronomy, 501 Campbell Hall #3411, University of California at Berkeley, Berkeley, CA 94720, USA; [email protected]Luke F. RobertsNational Superconducting Cyclotron Laboratory and Department of Physics, Michigan State University, East Lansing, MI, USAGoni HaleviDepartment of Astronomy, 501 Campbell Hall #3411, University of California at Berkeley, Berkeley, CA 94720, USA; [email protected]Christian D. OttTAPIR, California Institute of Technology, Pasadena, CA, USAJonas LippunerCCS-2, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USARoland HaasNCSA, University of Illinois, Urbana-Champaign, IL, USAErik SchnetterCenter for Computation & Technology, Louisiana State University, Baton Rouge, LA, USA

2018en

ABI

Annotatsiya

Abstract 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 10 13 G. Additionally, a comparison simulation that we restrict to axisymmetry results in overly optimistic r -process production for lower magnetic field strengths.

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DOI: 10.3847/1538-4357/aad6ec

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