Publications (95)
Iron-Group Abundances in the Metal-Poor Main Sequence Turnoff Star HD~84937
Christopher Sneden, John J. Cowan, Chiaki Kobayashi +4
We have derived new very accurate abundances of the Fe-group elements Sc through Zn (Z = 21-30) in the bright main-sequence turnoff star HD 84937, based on high-resolution spectra…
Stellar Population Astrophysics (SPA) with the TNG. Beyond the iron peak: Galactic evolution of molybdenum, ruthenium and zirconium through open clusters
Natalia Alvarez-Baena, Valentina D'Orazi, Christopher Sneden +11
The paper measures molybdenum, ruthenium, and zirconium abundances in 81 stars from 30 open clusters using high‑resolution HARPS‑N spectra to investigate the Galactic chemical evol…
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…
The -process nucleosynthesis in core-collapse supernovae II. Effect of the explosive recipe
Lorenzo Roberti, Marco Pignatari, Chris L. Fryer +1
The -process in core-collapse supernovae (CCSNe) can produce a number of neutron-deficient stable isotopes heavier than iron (p-nuclei). However, current model predictions do t…
A Large-scale Approach to Modelling Molecular Biosignatures: The Diatomics
Thomas M. Cross, David M. Benoit, Marco Pignatari +1
This work presents the first steps to modelling synthetic rovibrational spectra for all molecules of astrophysical interest using a new approach implemented in the Prometheus code.…
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…
Ariel: Enabling planetary science across light-years
Giovanna Tinetti, Paul Eccleston, Carole Haswell +313
Ariel, the Atmospheric Remote-sensing Infrared Exoplanet Large-survey, was adopted as the fourth medium-class mission in ESA's Cosmic Vision programme to be launched in 2029. Durin…
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…
Neutron Star Mergers Might not be the Only Source of r-Process Elements in the Milky Way
Benoit Côté, Marius Eichler, Almudena Arcones +8
Probing the origin of r-process elements in the universe represents a multi-disciplinary challenge. We review the observational evidence that probe the properties of r-process site…
Reproducing the observed abundances in RCB and HdC stars with post-double degenerate merger models - constraints on merger and post-merger simulations and physics processes
Athira Menon, Falk Herwig, Pavel A. Denissenkov +4
The R Coronae Borealis (RCB) stars are hydrogen-deficient, variable stars that are most likely the result of He-CO WD mergers. They display extremely low oxygen isotopic ratios, 16…
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…
The effect of 12C + 12C rate uncertainties on the weak s-process component
Michael E. Bennett, Raphael Hirschi, Marco Pignatari +9
The contribution by massive stars (M > 9 solar masses) to the weak s-process component of the solar system abundances is primarily due to the 22Ne neutron source, which is activate…
Modelling Triatomic Biosignatures: Ozone and Isotopomers
Thomas M. Cross, David M. Benoit, Marco Pignatari +1
In this work we present a new approach to produce spectroscopic constants and model first-principles synthetic spectra for all molecules of astrophysical interest. We have generali…
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…
Precise measurement of the thermal and stellar Fe()Fe cross sections via AMS
Anton Wallner, Tamas Belgya, Kathrin Buczak +14
The detection of long-lived radionuclides through ultra-sensitive single atom counting via accelerator mass spectrometry (AMS) offers opportunities for precise measurements of neut…
A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in omega Centauri
David Yong, John E. Norris, Gary S. Da Costa +5
We present a chemical abundance analysis of a metal-poor star, ROA 276, in the stellar system omega Centauri. We confirm that this star has an unusually high [Sr/Ba] abundance rati…
On the internal pollution mechanisms in the globular cluster NGC 6121 (M4): heavy-element abundances and AGB models
Valentina D'Orazi, Simon W. Campbell, Maria Lugaro +3
Globular clusters display significant variations in their light-element content, pointing to the existence of a second stellar generation formed from the ejecta of an earlier gener…
Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme
Paul Woodward, Falk Herwig, David Porter +3
The evolution of the first generations of stars at zero or extremly low metallicity, and especially some crucial properties like the primary N14 production, is charactarized by con…
Strontium-84 Enrichments in Presolar Grains Provide First Evidence of p-process Nucleosynthesis in Core-collapse Supernovae
Ishita Pal, Manavi Jadhav, Danielle Z. Shulaker +9
This study reports detection of rare p-process isotopes within presolar grains. Presolar grains are relic dust grains from dying stars. These microscopic dust particles are found i…
Origin of the p-process radionuclides 92Nb and 146Sm in the early Solar System and inferences on the birth of the Sun
Maria Lugaro, Marco Pignatari, Ulrich Ott +4
The abundances of 92Nb and 146Sm in the early Solar System are determined from meteoritic analysis and their stellar production is attributed to the p process. We investigate if th…
The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks
Ian U. Roederer, John J. Cowan, Marco Pignatari +11
We present new observational benchmarks of rapid neutron-capture process (r-process) nucleosynthesis for elements at and between the first (A ~ 80) and second (A ~ 130) peaks. Our…
Stellar yields and abundances: new directions from planetary nebulae
Maria Lugaro, Amanda I. Karakas, Marco Pignatari +1
Planetary nebulae retain the signature of the nucleosynthesis and mixing events that occurred during the previous AGB phase. Observational signatures complement observations of AGB…
The RADIOSTAR Project
Maria Lugaro, Benoit Côté, Marco Pignatari +12
Radioactive nuclei are the key to understanding the circumstances of the birth of our Sun because meteoritic analysis has proven that many of them were present at that time. Their…
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…
Representation of s-process abundances for comparison to data from bulk meteorites
Maria Lugaro, Mattias Ek, Mária PetŠ+4
Analysis of bulk meteorite compositions has revealed small isotopic variations due to the presence of material (e.g., stardust) that preserved the signature of nuclear reactions oc…
The Nucleosynthetic Yields of Core-Collapse Supernovae, prospects for the Next Generation of Gamma-Ray Astronomy
Sydney Andrews, Chris L. Fryer, Samuel W. Jones +2
Though the neutrino-driven convection model for the core-collapse explosion mechanism has received strong support in recent years, there are still many uncertainties in the explosi…
Molybdenum and ruthenium in the Galactic disk: A closer look at their nucleosynthesis components
Tamara Mishenina, Teresa Kurtukian-Nieto, Tatiana Gorbaneva +3
The stellar origin of the elements molybdenum (Mo, Z=42) and ruthenium (Ru, Z=44) is still a matter of debate. Studying their abundances provides valuable insights into nucleosynth…
Impact of the latest 22Ne+α reaction rates on nucleosynthesis in massive stars and galactic chemical evolution
Emma Kotar, Shuya Ota, Allyson Dewey +3
In massive stars (initial mass of > 9 solar masses), the weak s (slow neutron capture) process produces elements between Fe and Zr, enriching the Galaxy with these elements through…
Fluorine and Sodium in C-rich low-metallicity stars
Sara Lucatello, Thomas Masseron, Jennifer A. Johnson +2
We present the N, O, F and Na abundance and 12C/13C isotopic ratio measurements or upper limits for a sample of 10 C-rich, metal-poor giant stars, eight enhanced in s-process (CEMP…
Project ThaiPASS: International Outreach Blending Astronomy and Python
James D. Keegans, Richard J. Stancliffe, Lawrence E. Bilton +8
(ThaiPASS), a collaborative project comprising UK and Thai institutions and assess its impact and possible application to scho…
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…
3D Macro Physics and Light Odd-Z Element Production in O-C Shell Mergers: Implications for production and radiogenic heating inventories of rocky exoplanets
Joshua Issa, Falk Herwig, Stephen J. Mojzsis +1
The light odd-Z elements P, Cl, K, and Sc are underproduced in galactic chemical evolution models compared to spectroscopic observations of stars in the Milky Way. The most promisi…
Impact of 3D macro physics and nuclear physics on the p nuclei in O-C shell mergers
Joshua Issa, Falk Herwig, Pavel Denissenkov +1
O-C shell mergers in massive stars are a site for producing the p nuclei by the process, but 1D stellar models rely on mixing length theory, which does not match the radial ve…
The production of proton-rich isotopes beyond iron: The process in stars
Marco Pignatari, Kathrin Göbel, René Reifarth +1
Beyond iron, a small fraction of the total abundances in the Solar System is made of proton-rich isotopes, the p nuclei. The clear understanding of their production is a fundamenta…
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…
Isotopic ratios for C, N, Si, Al, and Ti in C-rich presolar grains from massive stars
Jordan Schofield, Marco Pignatari, Richard J Stancliffe +1
Certain types of silicon carbide (SiC) grains, e.g., SiC-X grains, and low density (LD) graphites are C-rich presolar grains that are thought to have condensed in the ejecta of cor…
H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars
Ondrea Clarkson, Falk Herwig, Robert Andrassy +3
We report on our ongoing investigation into the nucleosynthetic and hydrodynamic nature of mixing at the interface between the H- and He-convection zones in massive Pop III stars.…
The Diverse Origins of Neutron-Capture Elements in the Metal-Poor Star HD 94028: Possible Detection of Products of i-process Nucleosynthesis
Ian U. Roederer, Amanda I. Karakas, Marco Pignatari +1
We present a detailed analysis of the composition and nucleosynthetic origins of the heavy elements in the metal-poor ([Fe/H]=-1.62+/-0.09) star HD94028. Previous studies revealed…
Chemical abundance inventory in phosphorus-rich stars
Maren Brauner, Thomas Masseron, Marco Pignatari +1
We provide an overview of the latest advances in the study of phosphorus-rich stars, covering their detailed chemical abundance analyses and innovative mining approaches. Following…
129I and 247Cm in Meteorites Constrain the Last Astrophysical Source of Solar r-process Elements
Benoit Côté, Marius Eichler, Andrés Yagüe +12
The composition of the early Solar System can be inferred from meteorites. Many elements heavier than iron were formed by the rapid neutron-capture process (r process), but the ast…
Stellar Origins of Extremely - and -enriched Presolar SiC Grains: Novae or Supernovae?
Nan Liu, Larry R. Nittler, Conel M. O'D. Alexander +4
Extreme excesses of (/<10) and (/<20) in rare presolar SiC grains have been considered diagnostic of an origin in classical novae,…
The s process in massive stars, a benchmark for neutron capture reaction rates
Marco Pignatari, Roberto Gallino, Rene Reifarth
A clear definition of the contribution from the slow neutron-capture process (s process) to the solar abundances between Fe and the Sr-Zr region is a crucial challenge for nuclear…
Origin of Plutonium-244 in the Early Solar System
Maria Lugaro, Andrés Yagüe López, Benjámin Soós +5
We investigate the origin in the early Solar System of the short-lived radionuclide 244Pu (with a half life of 80 Myr) produced by the rapid (r) neutron-capture process. We conside…
Unveiling the chemical fingerprint of phosphorus-rich stars II. Heavy-element abundances from UVES/VLT spectra
Maren Brauner, Marco Pignatari, Thomas Masseron +2
The atmospheres of phosphorus-rich stars have been shown to contain between 10 and 100 times more P than our Sun. Given its crucial role as an essential element for life, it is esp…
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…
Re-evaluation of the O(,)O cross section at astrophysical energies and its role as neutron poison in the process
Peter Mohr, Christian Heinz, Marco Pignatari +3
The doubly-magic nucleus O has a small neutron capture cross section of just a few tens of microbarn in the astrophysical energy region. Despite of this, O plays an i…
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…
Do R Coronae Borealis Stars Form from Double White Dwarf Mergers?
Jan. E. Staff, Athira Menon, Falk Herwig +7
A leading formation scenario for R Coronae Borealis (RCB) stars invokes the merger of degenerate He and CO white dwarfs (WD) in a binary. The observed ratio of 16O/18O for RCB star…
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…
Reconstructing the Milky Way chemical map with Galactic Chemical Evolution tool OMEGA+ from SDSS-MWM
Viola Hegedűs, Szabolcs Mészáros, Blanka Világos +4
We obtain two-infall galactic chemical evolution (GCE) models simulating the chemical evolution of the Milky Way as constrained by a golden sample of stellar abundances o…
Spectacular nucleosynthesis from early massive stars
Alexander P. Ji, Sanjana Curtis, Nicholas Storm +39
Stars formed with initial mass over 50 Msun are very rare today, but they are thought to be more common in the early universe. The fates of those early, metal-poor, massive stars a…
HRMOS: A High-Resolution Multi-Object Spectrograph for the VLT
Laura Magrini, Thomas Bensby, Sofia Randich +174
This White Paper presents the scientific rationale and instrument concept for HRMOS (High-Resolution Multi-Object Spectrograph), a next-generation instrument proposed for the ESO V…
Chemical Evolution of Fluorine in the Milky Way
Kate A. Womack, Fiorenzo Vincenzo, Brad K. Gibson +5
Fluorine has many different potential sites and channels of production, making narrowing down a dominant site of fluorine production particularly challenging. In this work, we inve…
MESA and NuGrid Simulations of Classical Nova Outbursts and Nucleosynthesis
Pavel Denissenkov, Falk Herwig, Marco Pignatari +1
Classical novae are the results of surface thermonuclear explosions of hydrogen accreted by white dwarfs (WDs) from their low-mass main-sequence or red-giant binary companions. Che…
Enrichment of the Galactic disc with neutron-capture elements: Mo and Ru
Tamara Mishenina, Marco Pignatari, Tatiana Gorbaneva +4
We present new observational data for the heavy elements molybdenum (Mo, Z = 42) and ruthenium (Ru, Z = 44) in F-, G-, and K-stars belonging to different substructures of the Milky…
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…
Evolution and chemical and dynamical effects of high-mass stars
Georges Meynet, Cristina Chiappini, Cyril Georgy +4
We review general characteristics of massive stars, present the main observable constraints that stellar models should reproduce. We discuss the impact of massive star nucleosynthe…
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…
Nucleosynthetic Yields from Neutron Stars Accreting in Binary Common Envelopes
James D. Keegans, Chris L. Fryer, Samuel W. Jones +6
Massive-star binaries can undergo a phase where one of the two stars expands during its advanced evolutionary stage as a giant and envelops its companion, ejecting the hydrogen env…
Origin of large meteoritic SiC stardust grains in metal-rich AGB stars
Maria Lugaro, Borbála Cseh, Blanka Világos +16
Stardust grains that originated in ancient stars and supernovae are recovered from meteorites and carry the detailed composition of their astronomical sites of origin. We present e…
Stellar Interpretation of Meteoritic Data and PLotting for Everyone (SIMPLE): Isotope Mixing Lines for Six Sets of Core-Collapse Supernova Models
Marco Pignatari, Mattias Ek, Georgy V. Makhatadze +15
Bulk meteorites and their inclusions exhibit, for many chemical elements, isotopic variability produced by nucleosynthetic events in stars and supernovae before the formation of th…
Nova Framework: A New Tool For Modeling of Nova Outbursts and Nucleosynthesis
Pavel A. Denissenkov, Falk Herwig, Marco Pignatari +1
Classical novae are the results of surface thermonuclear explosions of H-rich material accreted by white dwarfs (WDs) from their low-mass main-sequence or red-giant binary companio…
Heavy Elements Nucleosynthesis On Accreting White Dwarfs: building seeds for the p-process
Umberto Battino, Marco Pignatari, Claudia Travaglio +5
The origin of the proton-rich trans-iron isotopes in the solar system is still uncertain. Single-degenerate thermonuclear supernovae (SNIa) with n-capture nucleosynthesis seeds ass…
MESA and NuGrid simulations of classical novae: CO and ONe nova nucleosynthesis
Pavel A. Denissenkov, James W. Truran, Marco Pignatari +6
Classical novae are the result of thermonuclear flashes of hydrogen accreted by CO or ONe white dwarfs, leading eventually to the dynamic ejection of the surface layers. These are…
Radioactive nuclei in the early Solar System: analysis of the 15 isotopes produced by core-collapse supernovae
Thomas V. Lawson, Marco Pignatari, Richard J. Stancliffe +5
Short-lived radioactive isotopes (SLRs) with half-lives between 0.1 to 100 Myr can be used to probe the origin of the Solar System. In this work, we examine the core-collapse super…
The Hydrodynamic Environment for the s Process in the He-Shell Flash of AGB Stars
Paul R. Woodward, David H. Porter, Falk Herwig +3
The He-shell flash convection in AGB stars is the site for the high-temperature component of the s-process in low- and intermediate mass giants, driven by the Ne22 neutron source.…
The s Process and Beyond
Maria Lugaro, Marco Pignatari, René Reifarth +1
Neutron captures produce the vast majority of abundances of elements heavier than iron in the Universe. Beyond the classical slow (s) and rapid (r) processes, there is observationa…
The Impact of Nuclear Physics Uncertainties on Galactic Chemical Evolution Predictions
Benoit Côté, Pavel Denissenkov, Falk Herwig +7
Modeling the evolution of the elements in the Milky Way is a multidisciplinary and challenging task. In addition to simulating the 13 billion years evolution of our Galaxy, chemica…
Chemical abundances in bright giants of the globular cluster M62 (NGC 6266)
David Yong, Alan Alves Brito, Gary S. Da Costa +8
With the exception of Terzan 5, all the Galactic globular clusters that possess significant metallicity spreads, such as omega Cen and M22, are preferentially the more luminous clu…
Impact of newly measured 26Al(n, p)26Mg and 26Al(n, α)23Na reaction rates on the nucleosynthesis of 26Al in stars
Umberto Battino, Claudia Lederer-Woods, Marco Pignatari +6
The cosmic production of the short-lived radioactive nuclide 26Al is crucial for our understanding of the evolution of stars and galaxies. However, simulations of the stellar sites…
SHADES -- Ne(,n)Mg reaction rate in the Gamow window
David Rapagnani, Chemseddine Ananna, Antonino Di Leva +4
Neutron capture reactions are the main contributors to the synthesis of the heavy elements through the s-process. Together with C(,n)16O, which has recently been measure…
Barium Isotopic Composition of Mainstream Silicon Carbides from Murchison: Constraints for s-Process Nucleosynthesis in AGB Stars
Nan Liu, Michael R. Savina, Andrew M. Davis +10
We present barium, carbon, and silicon isotopic compositions of 38 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly…
-process production in rotating massive stars at solar and low metallicities
Urs Frischknecht, Raphael Hirschi, Marco Pignatari +7
Rotation was shown to have a strong impact on the structure and light element nucleosynthesis in massive stars. In particular, models including rotation can reproduce the primary n…
Convective-reactive proton-C12 combustion in Sakurai's object (V4334 Sagittarii) and implications for the evolution and yields from the first generations of stars
Falk Herwig, Marco Pignatari, Paul R. Woodward +5
Depending on mass and metallicity as well as evolutionary phase, stars occasionally experience convective-reactive nucleosynthesis episodes. We specifically investigate the situati…
NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03
Umberto Battino, Ashley Tattersall, Claudia Lederer-Woods +6
The production of the neutron-capture isotopes beyond iron that we observe today in the solar system is the result of the combined contribution of the r-process, the s- process and…
Unveiling the chemical fingerprint of phosphorus-rich stars I. In the infrared region of APOGEE-2
Maren Brauner, Thomas Masseron, D. A. GarcÃa-Hernández +4
The origin of phosphorus, one of the essential elements for life on Earth, is currently unknown. Prevalent models of Galactic chemical evolution (GCE) underestimate the amount of P…
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…
Galactic Chemical Evolution of Radioactive Isotopes
Benoit Côté, Maria Lugaro, Rene Reifarth +4
The presence of short-lived (\,Myr) radioactive isotopes in meteoritic inclusions at the time of their formation represents a unique opportunity to study the circumstances th…
Evidence for Radiogenic Sulfur-32 in Type AB Presolar Silicon Carbide Grains?
Wataru Fujiya, Peter Hoppe, Ernst Zinner +2
We report C, Si, and S isotope measurements on 34 presolar silicon carbide grains of Type AB, characterized by 12C/13C < 10. Nitrogen, Mg-Al-, and Ca-Ti-isotopic compositions were…
The chemical evolution of the solar neighbourhood for planet-hosting stars
Marco Pignatari, Thomas C. L. Trueman, Kate A. Womack +13
Theoretical physical-chemical models for the formation of planetary systems depend on data quality for the Sun's composition, that of stars in the solar neighbourhood, and of the e…
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…
Exploring the link between star and planet formation with Ariel
Diego Turrini, Claudio Codella, Camilla Danielski +22
The goal of the Ariel space mission is to observe a large and diversified population of transiting planets around a range of host star types to collect information on their atmosph…
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…
Comparison between core-collapse supernova nucleosynthesis and meteoric stardust grains: investigating magnesium, aluminium, and chromium
Jacqueline den Hartogh, Maria K. Petö, Thomas Lawson +4
Isotope variations of nucleosynthetic origin among Solar System's solid samples are well documented, yet the origin of these variations is still uncertain. The observed variability…
i-Process Contribution of Rapidly Accreting White Dwarfs to the Solar Composition of First-Peak Neutron-Capture Elements
Benoit Côté, Pavel Denissenkov, Falk Herwig +4
Rapidly accreting white dwarfs (RAWDs) have been proposed as contributors to the chemical evolution of heavy elements in the Galaxy. Here, we test this scenario for the first time…
Relics of ancient post-AGB stars in a primitive meteorite
Manavi Jadhav, Marco Pignatari, Falk Herwig +3
Graphite is one of the many presolar circumstellar condensate species found in primitive meteorites. While the isotopic compositions of low-density graphite grains indicate an orig…
Galactic chemical evolution of short-lived radioactive isotopes produced by explosive nucleosynthesis: Fe and Mn
Thomas C. L. Truemam, Andrés Yagüe López, Maria Lugaro +1
Several short-lived radionuclides (SLRs) are know to have existed in the early Solar System (ESS). These species, which typically decay with half-lives of the order of a few millio…
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…
The NuGrid AGB Evolution and Nucleosynthesis Data Set
Umberto Battino, Marco Pignatari, Ashley Tattersall +2
Asymptotic Giant Branch (AGB) stars play a key role in the chemical evolution of galaxies. These stars are the fundamental stellar site for the production of light elements such as…
Stellar origin of 15N-rich presolar SiC grains of type AB: supernovae with explosive hydrogen burning
Nan Liu, Larry R. Nittler, Marco Pignatari +2
We report C, N, and Si isotopic data for 59 highly 13C-enriched presolar submicron- to micron-sized SiC grains from the Murchison meteorite, including eight putative nova grains (P…
Silicon Isotopic Composition of Mainstream Presolar SiC Grains Revisited: The Impact of Nuclear Reaction Rate Uncertainties
Hung Kwan Fok, Marco Pignatari, Benoît Côté +1
Presolar grains are stardust particles that condensed in the ejecta or in the outflows of dying stars and can today be extracted from meteorites. They recorded the nucleosynthetic…
Nucleosynthesis simulations for the production of the p-nuclei Mo and Mo in a Supernova type II model
Kathrin Göbel, Jan Glorius, Alexander Koloczek +4
We present a nucleosynthesis sensitivity study for the -process in a Supernova type II model within the NuGrid research platform. The simulations aimed at identifying the relev…
Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
Beatriz Barbuy, José G. Fernández-Trincado, Morgan S. Camargo +9
Phosphorus enhanced (P-rich; [P/Fe] > 0.8) giants have been found among mildly metal-poor fiels stars, but in only one star in a globular cluster (GC), M4 (NGC 6121). Also, in a sa…
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…
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.…