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Complete nucleosynthesis calculations for low-mass stars from NuGrid
Marco Pignatari, Falk Herwig, Michael Bennett +8
Many nucleosynthesis and mixing processes of low-mass stars as they evolve from the Main Sequence to the thermal-pulse Asymptotic Giant Branch phase (TP-AGB) are well understood (a…
Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion Models
Patrick Young, Carola I. Ellinger, Francis X. Timmes +10
We examine observed heavy element abundances in the Cassiopeia A supernova remnant as a constraint on the nature of the Cas A supernova. We compare bulk abundances from 1D and 3D e…
NuGrid: s process in massive stars
Raphael Hirschi, Urs Frischknecht, F. -K. Thielemann +10
The s-process production in massive stars at very low metallicities is expected to be negligible due to the low abundance of the neutron source 22Ne, to primary neutron poisons and…
Nucleosynthesis simulations for a wide range of nuclear production sites from NuGrid
Falk Herwig, Michael Bennett, Steven Diehl +8
Simulations of nucleosynthesis in astrophysical environments are at the intersection of nuclear physics reaction rate research and astrophysical applications, for example in the ar…
44Ti and 56Ni in core-collapse supernovae
Georgios Magkotsios, Francis X. Timmes, Michael Wiescher +9
We investigate the physical conditions where 44Ti and 56Ni are created in core-collapse supernovae. In this preliminary work we use a series of post-processing network calculations…
Nucleosynthetic Yields from "Collapsars"
Gabriel Rockefeller, Christopher L. Fryer, Patrick Young +8
The "collapsar" engine for gamma-ray bursts invokes as its energy source the failure of a normal supernova and the formation of a black hole. Here we present the results of the fir…
Nucleosynthesis Calculations from Core-Collapse Supernovae
Christopher L. Fryer, Patrick Young, Michael Bennett +8
We review some of the uncertainties in calculating nucleosynthetic yields, focusing on the explosion mechanism. Current yield calculations tend to either use a piston, energy injec…
NuGrid: Toward High Precision Double-Degenerate Merger Simulations with SPH in 3D
Steven Diehl, Christopher L. Fryer, Aimee Hungerford +11
We present preliminary results from recent high-resolution double-degenerate merger simulations with the Smooth Particle Hydrodynamics (SPH) technique. We put particular emphasis o…
Difficulties in Probing Nuclear Physics: A Study of Ti and Ni
Aimee Hungerford, Christopher L. Fryer, Francis X. Timmes +8
The nucleosynthetic yield from a supernova explosion depends upon a variety of effects: progenitor evolution, explosion process, details of the nuclear network, and nuclear rates.…
Stochastic Electron Acceleration in Shell-Type Supernova Remnants II
Siming Liu, Zhong-Hui Fan, Christopher L. Fryer
We discuss the generic characteristics of stochastic particle acceleration by a fully developed turbulence spectrum and show that resonant interactions of particles with high speed…
Stochastic Electron Acceleration in Shell-Type Supernova Remnants
Siming Liu, Zhong-Hui Fan, Christopher L. Fryer +2
We study the stochastic electron acceleration by fast mode waves in the turbulent downstream of weakly magnetized collisionless astrophysical shocks. The acceleration is most effic…