Publications (21)
Catching Element Formation In The Act
Chris L. Fryer, Frank Timmes, Aimee L. Hungerford +216
Gamma-ray astronomy explores the most energetic photons in nature to address some of the most pressing puzzles in contemporary astrophysics. It encompasses a wide range of objects…
Fe in core-collapse supernovae and prospects for X-ray and -ray detection in supernova remnants
Samuel Jones, Heiko Moeller, Chris L. Fryer +6
We investigate Fe in massive stars and core-collapse supernovae focussing on uncertainties that influence its production in 15, 20 and 25 stars at solar metallicit…
Uncertainties in Galactic Chemical Evolution Models
Benoit Côté, Christian Ritter, Brian W. O'Shea +4
We use a simple one-zone galactic chemical evolution model to quantify the uncertainties generated by the input parameters in numerical predictions, for a galaxy with properties si…
Implementation and Verification of Toroidal Resistive Wall Boundary Conditions in the PIXIE3D MHD code using a Boundary Integral Method
Samuel Jones, Luis Chacón, Jason Hamilton +2
We present the complete formulation of resistive wall boundary conditions in axisymmetric toroidal geometries as implemented in the PIXIE3D extended magnetohydrodynamics (MHD) code…
Polarimeter to Unify the Corona and Heliosphere (PUNCH)
Craig E. DeForest, Sarah E. Gibson, Ronnie Killough +74
The Polarimeter to Unify the Corona and Heliosphere (PUNCH) mission is a NASA Small Explorer to determine the cross-scale processes that unify the solar corona and heliosphere. PUN…
Do electron-capture supernovae make neutron stars? First multidimensional hydrodynamic simulations of the oxygen deflagration
Samuel Jones, Friedrich K. Roepke, Ruediger Pakmor +3
In the classical picture, electron-capture supernovae and the accretion-induced collapse of oxygen-neon white dwarfs (ONeWDs) undergo an oxygen deflagration phase before gravitatio…
The final fate of stars that ignite neon and oxygen off-center: electron capture or iron core-collapse supernova?
Samuel Jones, Raphael Hirschi, Ken'ichi Nomoto
In the ONeMg cores of stars, neon and oxygen burning is ignited off-center. Whether the neon-oxygen flame propagates to the center is critical to determine…
Testing a one-dimensional prescription of dynamical shear mixing with a two-dimensional hydrodynamic simulation
Philipp V. F. Edelmann, Friedrich K. Roepke, Raphael Hirschi +2
The treatment of mixing processes is still one of the major uncertainties in 1D stellar evolution models. This is mostly due to the need to parametrize and approximate aspects of h…
Propagating Uncertainties from Nuclear Physics to Gamma-rays in Core Collapse Supernovae
Chris L Fryer, Hendrik Schatz, Samuel Jones +18
Nuclear yields are powerful probes of supernova explosions, their engines and their progenitors. In addition, as we improve our understanding of these explosions, we can use nuclea…
Validation methodologies for turbulent variable density flows: A jet case study
Austin Davis, Samuel Jones, John J. Charonko +2
Comparisons studies between simulated variable density turbulent flows often consist of direct graphical representations where the level of agreement is determined by eye. This wor…
Advanced burning stages and fate of 8-10 Mo stars
Samuel Jones, Raphael Hirschi, Ken'ichi Nomoto +9
The stellar mass range 8<M/Mo<12 corresponds to the most massive AGB stars and the most numerous massive stars. It is host to a variety of supernova progenitors and is therefore ve…
The i-process yields of rapidly-accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parameterizations from 3D hydrodynamics simulations
Pavel Denissenkov, Falk Herwig, Paul Woodward +3
We have modelled the multicycle evolution of rapidly-accreting CO white dwarfs (RAWDs) with stable H burning intermittent with strong He-shell flashes on their surfaces for $0.7\le…
The impact of (n,) reaction rate uncertainties of unstable isotopes near on the i process nucleosynthesis in He-shell flash white dwarfs
Pavel Denissenkov, Georgios Perdikakis, Falk Herwig +6
The first peak s-process elements Rb, Sr, Y and Zr in the post-AGB star Sakurai's object (V4334 Sagittarii) have been proposed to be the result of i-process nucleosynthesis in a po…
i-process nucleosynthesis and mass retention efficiency in He-shell flash evolution of rapidly accreting white dwarfs
Pavel Denissenkov, Falk Herwig, Umberto Battino +4
Based on stellar evolution simulations, we demonstrate that rapidly accreting white dwarfs in close binary systems are an astrophysical site for the intermediate neutron-capture pr…
Production of heavy -elements and Ti in Cas A: comparison to abundances from 1D core-collapse supernova models and evidence for Carbon-Oxygen shell mergers
Luca Boccioli, Lorenzo Roberti, Chris L Fryer +3
The merger between the carbon (C) and oxygen (O) shells hours to days before the collapse of a massive star significantly changes its nucleosynthesis, which is reflected in the ele…
Synthetic observables for electron-capture supernovae and low-mass core collapse supernovae
Alexandra Kozyreva, Petr Baklanov, Samuel Jones +2
Stars in the mass range from 8 to 10 solar masses are expected to produce one of two types of supernovae (SNe), either electron-capture supernovae (ECSNe) or core-collapse supernov…
Type Ia Supernova Nucleosynthesis: Metallicity-Dependent Yields
James D Keegans, Marco Pignatari, Richard J Stancliffe +7
Type Ia supernova explosions (SNIa) are fundamental sources of elements for the chemical evolution of galaxies. They efficiently produce intermediate-mass (with Z between 11 and 20…
Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning
Samuel Jones, Raphael Hirschi, Marco Pignatari +5
Massive stars are key sources of radiative, kinetic, and chemical feedback in the universe. Grids of massive star models computed by different groups each using their own codes, in…
Idealised hydrodynamic simulations of turbulent oxygen-burning shell convection in 4Ï geometry
Samuel Jones, Robert Andrassy, Stou Sandalski +3
This work investigates the properties of convection in stars with particular emphasis on entrainment across the upper convective boundary (CB). Idealised simulations of turbulent c…
JINA-NuGrid Galactic Chemical Evolution Pipeline
Benoit Côté, Christian Ritter, Falk Herwig +5
Galactic chemical evolution is a topic that involves nuclear physics, stellar evolution, galaxy evolution, observation, and cosmology. Continuous communication and feedback between…
Chromium Nucleosynthesis and Silicon-Carbon Shell Mergers in Massive Stars
Benoit Côté, Samuel Jones, Falk Herwig +1
We analyze the production of the element Cr in galactic chemical evolution (GCE) models using the NuGrid nucleosynthesis yields set. We show that the unusually large [Cr/Fe] abunda…