Publications (24)
Impact of Pulsar and Fallback Sources on Multifrequency Kilonova Models
Ryan T. Wollaeger, Chris L. Fryer, Christopher J. Fontes +6
We explore the impact of pulsar electromagnetic dipole and fallback accretion emission on the luminosity of a suite of kilonova models. The pulsar models are varied over pulsar mag…
The Influence of Neutrinos on r-Process Nucleosynthesis in the Ejecta of Black Hole-Neutron Star Mergers
Luke F. Roberts, Jonas Lippuner, Matthew D. Duez +6
During the merger of a black hole and a neutron star, baryonic mass can become unbound from the system. Because the ejected material is extremely neutron-rich, the r-process rapidl…
Post-Outburst Radio Observations of the High Magnetic Field Pulsar PSR J1119-6127
Walid A. Majid, Aaron B. Pearlman, Tatyana Dobreva +4
We have carried out high frequency radio observations of the high magnetic field pulsar PSR J1119-6127 following its recent X-ray outburst. While initial observations showed no evi…
The Origin of r-Process Elements in the Milky Way
Benoit Côté, Chris L. Fryer, Krzysztof Belczynski +8
Some of the heavy elements, such as gold and europium (Eu), are almost exclusively formed by the rapid neutron capture process (r-process). However, it is still unclear which astro…
Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code
Roland Haas, Christian D. Ott, Bela Szilagyi +11
We present results on the inspiral, merger, and post-merger evolution of a neutron star - neutron star (NSNS) system. Our results are obtained using the hybrid pseudospectral-finit…
r-Process Lanthanide Production and Heating Rates in Kilonovae
Jonas Lippuner, Luke F. Roberts
r-Process nucleosynthesis in material ejected during neutron star mergers may lead to radioactively powered transients called kilonovae. The timescale and peak luminosity of these…
Axisymmetric Radiative Transfer Models of Kilonovae
Oleg Korobkin, Ryan Wollaeger, Christopher Fryer +9
The detailed observations of GW170817 proved for the first time directly that neutron star mergers are a major production site of heavy elements. The observations could be fit by a…
SpECTRE: A Task-based Discontinuous Galerkin Code for Relativistic Astrophysics
Lawrence E. Kidder, Scott E. Field, Francois Foucart +11
We introduce a new relativistic astrophysics code, SpECTRE, that combines a discontinuous Galerkin method with a task-based parallelism model. SpECTRE's goal is to achieve more acc…
Parthenon -- a performance portable block-structured adaptive mesh refinement framework
Philipp Grete, Joshua C. Dolence, Jonah M. Miller +12
On the path to exascale the landscape of computer device architectures and corresponding programming models has become much more diverse. While various low-level performance portab…
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…
R-process Nucleosynthesis from Three-Dimensional Magnetorotational Core-Collapse Supernovae
Philipp Mösta, Luke F. Roberts, Goni Halevi +4
We investigate r-process nucleosynthesis in three-dimensional (3D) general-relativistic magnetohydrodynamic simulations of rapidly rotating strongly magnetized core collapse. The s…
Signatures of hypermassive neutron star lifetimes on r-process nucleosynthesis in the disk ejecta from neutron star mergers
Jonas Lippuner, Rodrigo Fernández, Luke F. Roberts +4
We investigate the nucleosynthesis of heavy elements in the winds ejected by accretion disks formed in neutron star mergers. We compute the element formation in disk outflows from…
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…
Composition Effects on Kilonova Spectra and Light Curves: I
Wesley Even, Oleg Korobkin, Christopher L. Fryer +7
The merger of neutron star binaries is believed to eject a wide range of heavy elements into the universe. By observing the emission from this ejecta, scientists can probe the ejec…
Low mass binary neutron star mergers : gravitational waves and neutrino emission
Francois Foucart, Roland Haas, Matthew D. Duez +7
Neutron star mergers are among the most promising sources of gravitational waves for advanced ground-based detectors. These mergers are also expected to power bright electromagneti…
Full Transport Model of GW170817-Like Disk Produces a Blue Kilonova
Jonah M. Miller, Benjamin R. Ryan, Joshua C. Dolence +7
The 2017 detection of the inspiral and merger of two neutron stars in gravitational waves and gamma rays was accompanied by a quickly-reddening transient. Such a transient was pred…
Neutrino-heated winds from millisecond proto-magnetars as sources of the weak r-process
Andrey D. Vlasov, Brian D. Metzger, Jonas Lippuner +2
We explore heavy element nucleosynthesis in neutrino-driven winds from rapidly-rotating, strongly magnetized proto-neutron stars for which the magnetic dipole is aligned with the r…
Dynamics, nucleosynthesis, and kilonova signature of black hole - neutron star merger ejecta
Rodrigo Fernández, Francois Foucart, Daniel Kasen +3
We investigate the ejecta from black hole - neutron star mergers by modeling the formation and interaction of mass ejected in a tidal tail and a disk wind. The outflows are neutron…
Gamma-rays from kilonova: a potential probe of r-process nucleosynthesis
Oleg Korobkin, Aimee M. Hungerford, Christopher L. Fryer +11
The mergers of compact binaries with at least one neutron star component are the potential leading sites of the production and ejection of -process elements. Discoveries of gala…
FRIB and the GW170817 Kilonova
A. Aprahamian, R. Surman, A. Frebel +45
In July 2018 an FRIB Theory Alliance program was held on the implications of GW170817 and its associated kilonova for r-process nucleosynthesis. Topics of discussion included the a…
Gravitational waveforms for neutron star binaries from binary black hole simulations
Kevin Barkett, Mark A. Scheel, Roland Haas +9
Gravitational waves from binary neutron star (BNS) and black hole/neutron star (BHNS) inspirals are primary sources for detection by the Advanced Laser Interferometer Gravitational…
The landscape of disk outflows from black hole - neutron star mergers
Rodrigo Fernández, Francois Foucart, Jonas Lippuner
We investigate mass ejection from accretion disks formed in mergers of black holes (BHs) and neutron stars (NSs). The third observing run of the LIGO/Virgo interferometers provided…
SkyNet: A modular nuclear reaction network library
Jonas Lippuner, Luke F. Roberts
Almost all of the elements heavier than hydrogen that are present in our solar system were produced by nuclear burning processes either in the early universe or at some point in th…
Dynamical Mass Ejection from Binary Neutron Star Mergers
David Radice, Filippo Galeazzi, Jonas Lippuner +3
We present fully general-relativistic simulations of binary neutron star mergers with a temperature and composition dependent nuclear equation of state. We study the dynamical mass…