Publications (89)
NuGrid stellar data set I. Stellar yields from H to Bi for stars with metallicities Z = 0.02 and Z = 0.01
M. Pignatari, F. Herwig, R. Hirschi +16
We provide a set of stellar evolution and nucleosynthesis calculations that applies established physics assumptions simultaneously to low- and intermediate-mass and massive star mo…
Neutrinos from beta processes in a presupernova: probing the isotopic evolution of a massive star
Kelly M. Patton, Cecilia Lunardini, Robert J. Farmer +1
We present a new calculation of the neutrino flux received at Earth from a massive star in the hours of evolution prior to its explosion as a supernova (presupernova). Us…
Mapping Initial Hydrostatic Models in Godunov Codes
M. Zingale, L. J. Dursi, J. ZuHone +12
We look in detail at the process of mapping an astrophysical initial model from a stellar evolution code onto the computational grid of an explicit, Godunov type code while maintai…
Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
Bill Paxton, Josiah Schwab, Evan B. Bauer +10
We update the capabilities of the software instrument Modules for Experiments in Stellar Astrophysics (MESA) and enhance its ease of use and availability. Our new approach to locat…
Skye: A Differentiable Equation of State
Adam S. Jermyn, Josiah Schwab, Evan Bauer +2
Stellar evolution and numerical hydrodynamics simulations depend critically on access to fast, accurate, thermodynamically consistent equations of state. We present Skye, a new equ…
Photons from neutrinos: the gamma ray echo of a supernova neutrino burst
Cecilia Lunardini, Joshua Loeffler, Mainak Mukhopadhyay +3
When a star undergoes core collapse, a vast amount of energy is released in a ~10 s long burst of neutrinos of all species. Inverse beta decay in the star's hydrogen envelope cause…
Mixing of Clumpy Supernova Ejecta into Molecular Clouds
Liubin Pan, Steven J. Desch, Evan Scannapieco +1
Several lines of evidence, from isotopic analyses of meteorites to studies of the Sun's elemental and isotopic composition, indicate that the solar system was contaminated early in…
Freeze-out yields of radioactivities in core-collapse supernovae
Georgios Magkotsios, F. X. Timmes, Michael Wiescher
We explore the nucleosynthesis trends from two mechanisms during freeze-out expansions in core-collapse supernovae. The first mechanism is related to the convection and instabiliti…
26Al and 60Fe From Supernova Explosions
F. X. Timmes, S. E. Woosley, D. H. Hartmann +3
Using recently calculated yields for Type II supernovae, along with models for chemical evolution and the distribution of mass in the interstellar medium, the current abundances an…
The Neutron Star and Black Hole Initial Mass Function
F. X. Timmes, S. E. Woosley, T. A. Weaver
Using recently calculated models for massive stellar evolution and supernovae coupled to a model for Galactic chemical evolution, neutron star and black hole birth functions (numbe…
Placing the Sun in Galactic Chemical Evolution: Mainstream SiC Particles
F. X. Timmes, D. D. Clayton
We examine the consequences and implications of the possibility that the best-fit =4/3 line of the silicon isotopic ratios measured in mainstream SiC grains is identical or para…
Abundance Histories for QSO Absorption Line Systems
F. X. Timmes, J. T. Lauroesch, J. W. Truran
Abundance histories for QSO absorption line systems as a function of redshift are presented for all metals lighter than gallium. Coupling various conventional cosmological models w…
Light Element Abundances From z=0 To z=5
F. X. Timmes, J. W. Truran, J. T. Lauroesch +1
Plausible ratios of deuterium to hydrogen D/H as a function of metallicity, time, and redshift are investigated. Guided by the heavy element abundance patterns observed locally in…
The Impact of White Dwarf Luminosity Profiles on Oscillation Frequencies
F. X. Timmes, Richard H. D. Townsend, Evan B. Bauer +3
KIC 08626021 is a pulsating DB white dwarf of considerable recent interest, and first of its class to be extensively monitored by Kepler for its pulsation properties. Fitting the o…
On Carbon Burning in Super Asymptotic Giant Branch Stars
R. Farmer, C. E. Fields, F. X. Timmes
We explore the detailed and broad properties of carbon burning in Super Asymptotic Giant Branch (SAGB) stars with 2755 MESA stellar evolution models. The location of first carbon i…
Regimes Of Helium Burning
F. X. Timmes, J. C. Niemeyer
The burning regimes encountered by laminar deflagrations and ZND detonations propagating through helium-rich compositions in the presence of buoyancy-driven turbulence are analyzed…
Resolving The Peak Of The Black Hole Mass Spectrum
Ebraheem Farag, Mathieu Renzo, Robert Farmer +2
Gravitational wave (GW) detections of binary black hole (BH) mergers have begun to sample the cosmic BH mass distribution. The evolution of single stellar cores predicts a gap in t…
The effect of 12C + 12C rate uncertainties on the evolution and nucleosynthesis of massive stars
M. E. Bennett, R. Hirschi, M. Pignatari +8
[Shortened] The 12C + 12C fusion reaction has been the subject of considerable experimental efforts to constrain uncertainties at temperatures relevant for stellar nucleosynthesis.…
Proton-Rich Nuclear Statistical Equilibrium
I. R. Seitenzahl, F. X. Timmes, A. Marin-Laflèche +3
Proton-rich material in a state of nuclear statistical equilibrium (NSE) is one of the least studied regimes of nucleosynthesis. One reason for this is that after hydrogen burning,…
Localised thermonuclear bursts from accreting magnetic white dwarfs
S. Scaringi, P. J. Groot, C. Knigge +16
Nova explosions are caused by global thermonuclear runaways triggered in the surface layers of accreting white dwarfs. It has been predicted that localised thermonuclear bursts on…
Constraints on explosive silicon burning in core-collapse supernovae from measured Ni/Fe ratios
A. Jerkstrand, F. X. Timmes, G. Magkotsios +7
Measurements of explosive nucleosynthesis yields in core-collapse supernovae provide tests for explosion models. We investigate constraints on explosive conditions derivable from m…
On Validating an Astrophysical Simulation Code
A. C. Calder, B. Fryxell, T. Plewa +15
We present a case study of validating an astrophysical simulation code. Our study focuses on validating FLASH, a parallel, adaptive-mesh hydrodynamics code for studying the compres…
The Effects of Changes in Reaction Rates on Simulations of Nova Explosions
S. Starrfield, C. Iliadis, W. R. Hix +2
Classical novae participate in the cycle of Galactic chemical evolution in which grains and metal enriched gas in their ejecta, supplementing those of supernovae, AGB stars, and Wo…
On Type Ia Supernovae From The Collisions of Two White Dwarfs
Cody Raskin, F. X. Timmes, Evan Scannapieco +2
We explore collisions between two white dwarfs as a pathway for making Type Ia Supernovae (SNIa). White dwarf number densities in globular clusters allow 10-100 redshift <1 collisi…
Convective Properties of Rotating Two-Dimensional Core-Collapse Supernova Progenitors
Emmanouil Chatzopoulos, Sean M. Couch, W. David Arnett +1
We explore the effects of rotation on convective carbon, oxygen, and silicon shell burning during the late stages of evolution in a 20Msun star. Using the Modules for Experiments i…
On variations of the brightness of type Ia supernovae with the age of the host stellar population
Brendan K. Krueger, Aaron P. Jackson, Dean M. Townsley +3
Recent observational studies of type Ia supernovae (SNeIa) suggest correlations between the peak brightness of an event and the age of the progenitor stellar population. This trend…
On The Impact Of 22Ne On The Pulsation Periods Of Carbon-Oxygen White Dwarfs With Helium Dominated Atmospheres
Morgan T. Chidester, F. X. Timmes, Josiah Schwab +6
We explore changes in the adiabatic low-order g-mode pulsation periods of 0.526, 0.560, and 0.729 M carbon-oxygen white dwarf models with helium-dominated envelopes due to…
Surface Hydrogen Modeling of Super Soft X-ray Sources: Are They Supernova Ia Progenitors?
S. Starrfield, F. X. Timmes, W. R. Hix +3
Nova explosions occur on the white dwarf (WD) component of a Cataclysmic Variable stellar system which is accreting matter lost by a companion. A Type Ia supernova explosion is tho…
A Tracer Method for Computing Type Ia Supernova Yields: Burning Model Calibration, Reconstruction of Thickened Flames, and Verification for Planar Detonations
Dean M. Townsley, Broxton J. Miles, F. X. Timmes +2
We refine our previously introduced parameterized model for explosive carbon-oxygen fusion during thermonuclear supernovae (SN Ia) by adding corrections to post-processing of recor…
On Silicon Group Elements Ejected by Supernovae Type Ia
Soma De, F. X. Timmes, Themis Athanassiadou +6
There is compelling evidence that the peak brightness of a Type Ia supernova is affected by the electron fraction Ye at the time of the explosion. The electron fraction is set by t…
On the observability of individual Population III stars and their stellar-mass black hole accretion disks through cluster caustic transits
Rogier A. Windhorst, F. X. Timmes, J. Stuart B. Wyithe +8
We summarize panchromatic Extragalactic Background Light data to place upper limits on the integrated near-infrared surface brightness (SB) that may come from Population III stars…
Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
Bill Paxton, Pablo Marchant, Josiah Schwab +10
We substantially update the capabilities of the open-source software instrument Modules for Experiments in Stellar Astrophysics (MESA). MESA can now simultaneously evolve an intera…
The Impact of Nuclear Reaction Rate Uncertainties On The Evolution of Core-Collapse Supernova Progenitors
C. E. Fields, F. X. Timmes, R. Farmer +3
We explore properties of core-collapse supernova progenitors with respect to the composite uncertainties in the thermonuclear reaction rates by coupling the reaction rate probabili…
Simulations of Astrophysical Fluid Instabilities
A. C. Calder, B. Fryxell, R. Rosner +7
We present direct numerical simulations of mixing at Rayleigh-Taylor unstable interfaces performed with the FLASH code, developed at the ASCI/Alliances Center for Astrophysical The…
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift
Brian Welch, Dan Coe, Erik Zackrisson +60
The gravitationally lensed star WHL0137-LS, nicknamed Earendel, was identified with a photometric redshift based on images taken with the Hubble Space Tele…
Constraints from Al Measurements on the Galaxy's Recent Global Star Formation Rate and Core Collapse Supernovae Rate
F. X. Timmes, R. Diehl, D. H. Hartmann
Gamma-rays from the decay of Al offer a stringent constraint on the Galaxy's global star formation rate over the past million years, supplementing other methods for quantify…
Evaluating Systematic Dependencies of Type Ia Supernovae: The Influence of Deflagration to Detonation Density
Aaron P. Jackson, Alan C. Calder, Dean M. Townsley +3
We explore the effects of the deflagration to detonation transition (DDT) density on the production of Ni-56 in thermonuclear supernova explosions (type Ia supernovae). Within the…
Properties of Carbon-Oxygen White Dwarfs From Monte Carlo Stellar Models
C. E. Fields, R. Farmer, I. Petermann +2
We investigate properties of carbon-oxygen white dwarfs with respect to the composite uncertainties in the reaction rates using the stellar evolution toolkit, Modules for Experimen…
Stellar Abundances in the Solar Neighborhood: The Hypatia Catalog
Natalie R. Hinkel, F. X. Timmes, Patrick A. Young +2
We compile spectroscopic abundance data from 84 literature sources for 50 elements across 3058 stars in the solar neighborhood, within 150 pc of the Sun, to produce the Hypatia Cat…
On Trapped Modes In Variable White Dwarfs As Probes Of The C()O Reaction Rate
Morgan T. Chidester, Ebraheem Farag, F. X. Timmes
We seek signatures of the current experimental CO reaction rate probability distribution function in the pulsation periods of carbon-oxygen white dwarf models.…
Seismic Signatures of the C(, )O Reaction Rate in White Dwarf Models with Overshooting
Morgan T. Chidester, F. X. Timmes, Ebraheem Farag
We consider the combined effects that overshooting and the C(, )O reaction rate have on variable white dwarf stellar models. We find that carbon-oxygen white…
Turbulent Chemical Diffusion in Convectively Bounded Carbon Flames
Daniel Lecoanet, Josiah Schwab, Eliot Quataert +6
It has been proposed that mixing induced by convective overshoot can disrupt the inward propagation of carbon deflagrations in super-asymptotic giant branch stars. To test this the…
Production of carbon-rich presolar grains from massive stars
M. Pignatari, M. Wiescher, F. X. Timmes +6
About a year after core collapse supernova, dust starts to condense in the ejecta. In meteorites, a fraction of C-rich presolar grains (e.g., silicon carbide (SiC) grains of Type-X…
Carbon-rich presolar grains from massive stars. Subsolar 12C/13C and 14N/15N ratios and the mystery of 15N
M. Pignatari, E. Zinner, P. Hoppe +7
Carbon-rich grains with isotopic anomalies compared to the Sun are found in primitive meteorites. They were made by stars, and carry the original stellar nucleosynthesis signature.…
Mixing by Non-linear Gravity Wave Breaking on a White Dwarf Surface
A. C. Calder, A. Alexakis, L. J. Dursi +7
We present the results of a simulation of a wind-driven non-linear gravity wave breaking on the surface of a white dwarf. The ``wind'' consists of H/He from an accreted envelope, a…
The Three Dimensional Evolution to Core Collapse of a Massive Star
Sean M. Couch, Emmanouil Chatzopoulos, W. David Arnett +1
We present the first three dimensional (3D) simulation of the final minutes of iron core growth in a massive star, up to and including the point of core gravitational instability a…
Making Black Holes in Supernovae
S. E. Woosley, F. X. Timmes
The possibility of making stellar mass black holes in supernovae that otherwise produce viable Type II and Ib supernova explosions is discussed and estimates given of their number…
Statistical Methods for Thermonuclear Reaction Rates and Nucleosynthesis Simulations
Christian Iliadis, Richard Longland, Alain Coc +2
Rigorous statistical methods for estimating thermonuclear reaction rates and nucleosynthesis are becoming increasingly established in nuclear astrophysics. The main challenge being…
Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
Bill Paxton, Matteo Cantiello, Phil Arras +8
We substantially update the capabilities of the open source software package Modules for Experiments in Stellar Astrophysics (MESA), and its one-dimensional stellar evolution modul…
Evaluating Systematic Dependencies of Type Ia Supernovae: The Influence of Progenitor Ne22 Content on Dynamics
Dean M. Townsley, Aaron P. Jackson, Alan C. Calder +3
We present a theoretical framework for formal study of systematic effects in Supernovae Type Ia (SN Ia) that utilizes 2-d simulations to implement a form of the deflagration-detona…
The Reduction of the Electron Abundance during the Pre-explosion Simmering in White Dwarf Supernovae
David A. Chamulak, Edward F. Brown, F. X. Timmes +1
Prior to the explosion of a carbon-oxygen white dwarf in a Type Ia supernova there is a long "simmering," during which the 12C + 12C reaction gradually heats the white dwarf on a l…
The light curve of SN 1987A revisited: constraining production masses of radioactive nuclides
I. R. Seitenzahl, F. X. Timmes, G. Magkotsios
We revisit the evidence for the contribution of the long-lived radioactive nuclides 44Ti, 55Fe, 56Co, 57Co, and 60Co to the UVOIR light curve of SN 1987A. We show that the V-band l…
An Expanded Set of Los Alamos OPLIB Tables in MESA: Type-1 Rosseland-mean Opacities and Solar Models
Ebraheem Farag, Christopher J. Fontes, F. X. Timmes +11
We present a set of 1194 Type-1 Rosseland-mean opacity tables for four different metallicity mixtures. These new Los Alamos OPLIB atomic radiative opacity tables are an order of ma…
The Response of Model and Astrophysical Thermonuclear Flames to Curvature and Stretch
L. J. Dursi, M. Zingale, A. C. Calder +11
Critically understanding the `standard candle'-like behavior of Type Ia supernovae requires understanding their explosion mechanism. One family of models for Type Ia Supernovae beg…
Remnants of Binary White Dwarf Mergers
Cody Raskin, Evan Scannapieco, Chris Fryer +2
We carry out a comprehensive smooth particle hydrodynamics simulation survey of double-degenerate white dwarf binary mergers of varying mass combinations in order to establish corr…
Stellar Neutrino Emission Across The Mass-Metallicity Plane
Ebraheem Farag, F. X. Timmes, Morgan T. Chidester +2
We explore neutrino emission from nonrotating, single star models across six initial metallicities and seventy initial masses from the zero-age main sequence to the final fate. Ove…
Quantifying How Density Gradients and Front Curvature Affect Carbon Detonation Strength During Type Ia Supernovae
Broxton J. Miles, Dean M. Townsley, Ken J. Shen +2
Accurately reproducing the physics behind the detonations of Type Ia supernovae and the resultant nucleosynthetic yields is important for interpreting observations of spectra and r…
Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
Bill Paxton, R. Smolec, Josiah Schwab +14
We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). RSP is a new functionality in MESAstar that models the…
The Effects of the pep Nuclear Reaction and Other Improvements in the Nuclear Reaction Rate Library on Simulations of the Classical Nova Outburst
S. Starrfield, C. Iliadis, W. R. Hix +2
We have continued our studies of the Classical Nova outburst by evolving TNRs on 1.25Msun and 1.35Msun WDs (ONeMg composition) under conditions which produce mass ejection and a ra…
Galactic Evolution of Silicon Isotopes: Application to Presolar SiC Grains From Meteorites
F. X. Timmes, Donald D. Clayton
We calculate and discuss the chemical evolution of the isotopic silicon abundances in the interstellar medium at distances and times appropriate to the birth of the solar system. T…
Silicon carbide grains of type C provide evidence for the production of the unstable isotope Si in supernovae
M. Pignatari, E. Zinner, M. G. Bertolli +8
Carbon-rich grains are observed to condense in the ejecta of recent core-collapse supernovae, within a year after the explosion. Silicon carbide grains of type X are C-rich grains…
On Variations Of Pre-Supernova Model Properties
R. Farmer, C. E. Fields, I. Petermann +4
We explore the variation in single star 15-30 , non-rotating, solar metallicity, pre-supernova MESA models due to changes in the number of isotopes in a fully-coupl…
On Heavy Element Enrichment in Classical Novae
A. Alexakis, A. C. Calder, A. Heger +10
Many classical nova ejecta are enriched in CNO and Ne. Rosner et al. recently suggested that the enrichment might originate in the resonant interaction between large-scale shear fl…
Onset of Convectionon a Pre-Runaway White Dwarf
L. J. Dursi, A. C. Calder, A. Alexakis +7
Observed novae abundances and explosion energies estimated from observations indicate that there must be significant mixing of the heavier material of the white dwarf (C+O) into th…
Hydrodynamic Studies of the Evolution of Recurrent, Symbiotic, and Dwarf Novae: The White Dwarf Components are Growing in Mass
S. Starrfield, F. X. Timmes, C. Iliadis +4
Symbiotic binaries are systems containing white dwarfs (WDs) and red giants. Symbiotic novae are those systems in which thermonuclear eruptions occur on the WD components. These ar…
On Measuring the Metallicity of a Type Ia Supernova's Progenitor
Broxton J. Miles, Daniel R. van Rossum, Dean M. Townsley +4
In Type Ia Supernovae (\sneia), the relative abundances of chemical elements are affected by the neutron excess in the composition of the progenitor white dwarf. Since these produc…
Understanding Compact Object Formation and Natal Kicks I. Calculation Methods and the case of GRO J1655-40
B. Willems, M. Henninger, T. Levin +5
In recent years proper motion measurements have been added to the set of observational constraints on the current properties of Galactic X-ray binaries. We develop an analysis that…
Horizons: Nuclear Astrophysics in the 2020s and Beyond
H. Schatz, A. D. Becerril Reyes, A. Best +162
Nuclear Astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the…
The 12C + 12C reaction and the impact on nucleosynthesis in massive stars
M. Pignatari, R. Hirschi, M. Wiescher +7
Despite much effort in the past decades, the C-burning reaction rate is uncertain by several orders of magnitude, and the relative strength between the different channels 12C(12C,a…
The Production of Ti44 and Co60 in Supernova
F. X. Timmes, S. E. Woosley, D. H. Hartmann +1
The production of the radioactive isotopes Ti and Co in all types of supernovae is examined and compared to observational constraints including Galactic --ray sur…
MESA-Web: A cloud resource for stellar evolution in astronomy curricula
Carl E. Fields, Richard H. D. Townsend, A. L. Dotter +2
We present MESA-Web, a cloud resource with an online interface to the Modules for Experiments in Stellar Astrophysics (MESA) software instrument. MESA-Web allows learners to evolve…
Modules for Experiments in Stellar Astrophysics (MESA): Time-Dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure
Adam S. Jermyn, Evan B. Bauer, Josiah Schwab +19
We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). The new auto_diff module implements automatic different…
Local Ignition in Carbon/Oxygen White Dwarfs -- I: One-zone Ignition and Spherical Shock Ignition of Detonations
L. Jonathan Dursi, F. X. Timmes
The details of ignition of Type Ia supernovae remain fuzzy, despite the importance of this input for any large-scale model of the final explosion. Here, we begin a process of under…
The Importance of Computation in Astronomy Education
M. Zingale, F. X. Timmes, R. Fisher +1
Computational skills are required across all astronomy disciplines. Many students enter degree programs without sufficient skills to solve computational problems in their core clas…
On Variations in the Peak Luminosity of Type Ia Supernovae
F. X. Timmes, Edward F. Brown, J. W. Truran
We explore the idea that the observed variations in the peak luminosities of Type Ia supernovae originate in part from a scatter in metallicity of the main-sequence stars that beco…
Observing intermediate-mass black holes and the upper--stellar-mass gap with LIGO and Virgo
Ajit Kumar Mehta, Alessandra Buonanno, Jonathan Gair +5
Using ground-based gravitational-wave detectors, we probe the mass function of intermediate-mass black holes (IMBHs) wherein we also include BHs in the upper mass gap $\sim 60-130~…
Theoretical Studies of Accretion of Matter onto White Dwarfs and the Single Degenerate Scenario for Supernovae of Type Ia
S. Starrfield, C. Iliadis, F. X. Timmes +4
We present a brief summary of the Single Degenerate Scenario for the progenitors of Type Ia Supernovae in which it is assumed that a low mass carbon-oxygen white dwarf is growing i…
Presupernova neutrinos: directional sensitivity and prospects for progenitor identification
Mainak Mukhopadhyay, Cecilia Lunardini, F. X. Timmes +1
We explore the potential of current and future liquid scintillator neutrino detectors of O (10) kt mass to localize a pre-supernova neutrino signal in the sky. In the hours precedi…
Investigations of Pointwise Ignition of Helium Deflagrations on Neutron Stars
M. Zingale, S. E. Woosley, A. Cumming +7
We look at the spreading of localized temperature perturbations in the accreted fuel layer of a non-rotating neutron star. The pressure at the base of the accreted fuel layer is la…
The 12C(a,g)16O reaction and its implications for stellar helium burning
R. J. deBoer, J. Gorres, M. Wiescher +10
The creation of carbon and oxygen in our universe is one of the forefront questions in nuclear astrophysics. The determination of the abundance of these elements is key to both our…
Laminar Flame Speeds in Degenerate Oxygen-Neon Mixtures
Josiah Schwab, R. Farmer, F. X. Timmes
The collapse of degenerate oxygen-neon cores (i.e., electron-capture supernovae or accretion-induced collapse) proceeds through a phase in which a deflagration wave ("flame") forms…
A Highly Magnified Star at Redshift 6.2
Brian Welch, Dan Coe, Jose M. Diego +26
Galaxy clusters magnify background objects through strong gravitational lensing. Typical magnifications for lensed galaxies are factors of a few but can also be as high as tens or…
STARLIB: A Next-Generation Reaction-Rate Library for Nuclear Astrophysics
A. L. Sallaska, C. Iliadis, A. E. Champagne +3
STARLIB is a next-generation, all-purpose nuclear reaction-rate library. For the first time, this library provides the rate probability density at all temperature grid points for c…
On Stellar Evolution In A Neutrino Hertzsprung-Russell Diagram
Ebraheem Farag, F. X. Timmes, Morgan Taylor +2
We explore the evolution of a select grid of solar metallicity stellar models from their pre-main sequence phase to near their final fates in a neutrino Hertzsprung-Russell diagram…
Large-Scale Simulations of Clusters of Galaxies
P. M. Ricker, A. C. Calder, L. J. Dursi +9
We discuss some of the computational challenges encountered in simulating the evolution of clusters of galaxies. Eulerian adaptive mesh refinement (AMR) techniques can successfully…
Modeling Astrophysical Explosions with Sustained Exascale Computing
M. Zingale, A. C. Calder, C. M. Malone +1
Our understanding of stars and their fates is based on coupling observations to theoretical models. Unlike laboratory physicists, we cannot perform experiments on stars, but rather…
Observational evidence for high neutronization in supernova remnants: implications for Type Ia supernova progenitors
Héctor MartÃnez-RodrÃguez, Carles Badenes, Hiroya Yamaguchi +8
The physical process whereby a carbon--oxygen white dwarf explodes as a Type Ia supernova (SN Ia) remains highly uncertain. The degree of neutronization in SN Ia ejecta holds clues…
56Ni Production in Double Degenerate White Dwarf Collisions
Cody Raskin, Evan Scannapieco, Gabriel Rockefeller +3
We present a comprehensive study of white dwarf collisions as an avenue for creating type Ia supernovae. Using a smooth particle hydrodynamics code with a 13-isotope, α-chain nucl…
Constraints on the Progenitor of Cassiopeia A
Patrick A. Young, Chris L. Fryer, Aimee Hungerford +6
We compare a suite of 3D explosion calculations and stellar models incorporating advanced physics with observational constraints on the progenitor of Cassiopeia A. We consider bina…