Jonas Lippuner
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View article: Parthenon—a performance portable block-structured adaptive mesh refinement framework
Parthenon—a performance portable block-structured adaptive mesh refinement framework Open
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 portable programming models are available, support at the applica…
View article: Parthenon -- a performance portable block-structured adaptive mesh refinement framework
Parthenon -- a performance portable block-structured adaptive mesh refinement framework Open
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 portable programming models are available, support at the applica…
View article: Axisymmetric Radiative Transfer Models of Kilonovae
Axisymmetric Radiative Transfer Models of Kilonovae Open
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 number of simulations that qualitatively agree, but can qu…
View article: The Impact of Nuclear Physics Uncertainties on Galactic Chemical Evolution Predictions
The Impact of Nuclear Physics Uncertainties on Galactic Chemical Evolution Predictions Open
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, chemical evolution simulations must keep track of the elements s…
View article: Composition Effects on Kilonova Spectra and Light Curves. I
Composition Effects on Kilonova Spectra and Light Curves. I Open
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 ejecta properties (mass, velocity, and composition distribution…
View article: The landscape of disc outflows from black hole–neutron star mergers
The landscape of disc outflows from black hole–neutron star mergers Open
We investigate mass ejection from accretion discs formed in mergers of black holes (BHs) and neutron stars (NSs). The third observing run of the LIGO/Virgo interferometers provided BH–NS candidate events that yielded no electromagnetic (EM…
View article: The landscape of disk outflows from black hole - neutron star mergers
The landscape of disk outflows from black hole - neutron star mergers Open
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 BH-NS candidate events that yielded no electromagnetic (EM…
View article: Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>r</mml:mi></mml:math>-process abundance peak in neutron-star merger calculations
Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first -process abundance peak in neutron-star merger calculations Open
We report mass measurements of neutron-rich Ga isotopes $^{80-85}$Ga with\nTRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The measurements\ndetermine the masses of $^{80-83}$Ga in good agreement with previous\nmeasurements. The …
View article: Nucleosynthesis Probes of Cosmic Explosions [Slides]
Nucleosynthesis Probes of Cosmic Explosions [Slides] Open
GW170817 demonstrated the potential of GW+EM observations of NS mergers: most direct observation of r-process production to date. But what can we really learn from the observations. Getting from the observations to constraining properties …
View article: Full transport model of GW170817-like disk produces a blue kilonova
Full transport model of GW170817-like disk produces a blue kilonova Open
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 predicted to occur following a rapid neutron capture (r-process…
View article: C++ Introduction and Best Practices
C++ Introduction and Best Practices Open
NPS EVSE projects based on interviews with NPS employees and stakeholders involved in the projects. The report summarizes notable takeaways and makes recommendations to help ensure the success of future charging installation projects. Pres…
View article: From the microscopic to the macroscopic world: from nucleons to neutron stars
From the microscopic to the macroscopic world: from nucleons to neutron stars Open
Recent observations of neutron-star properties, in particular the recent\ndetection of gravitational waves emitted from binary neutron stars, GW 170817,\nopen the way to put strong constraints on nuclear interactions. In this paper,\nwe re…
View article: r-Process nucleosynthesis and kilonovae in neutron star mergers
r-Process nucleosynthesis and kilonovae in neutron star mergers Open
This report presents an overview of r-process nucleosynthesis, describes r-process in neutron star mergers, and explains the observation signature of r-process. Data and findings from the study are included.
View article: The origin of heavy elements [Slides]
The origin of heavy elements [Slides] Open
Only 2% of ordinary matter is heavier than helium. Nuclear fusion in stars produces elements up to iron. Supernovae mainly make iron-peak elements. Slow and rapid neutron capture synthesize heavy elements above iron peak. s-process happens…
View article: FRIB and the GW170817 Kilonova
FRIB and the GW170817 Kilonova Open
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 astrophysical and nuclear physics uncertainties in the inter…
View article: The Origin of r-process Elements in the Milky Way
The Origin of r-process Elements in the Milky Way Open
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 astrophysical site between core-collapse supernovae and neutro…
View article: SkyNet: A Modular Nuclear Reaction Network Library
SkyNet: A Modular Nuclear Reaction Network Library Open
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 the life cycle of stars. In all of these environments, there …
View article: Nucleosynthesis outreach slides
Nucleosynthesis outreach slides Open
The purpose of this report is to explain s- and r-process nucleosynthesis to the general public at outreach events, specifically in a Planetarium show at the Pajarito Environmental Education Center in Los Alamos.
View article: SkyNet: A modular nuclear reaction network library
SkyNet: A modular nuclear reaction network library Open
This is the version of the SkyNet code used in http://adsabs.harvard.edu/abs/2017arXiv170606198L. The latest version of the code is available at https://bitbucket.org/jlippuner/skynet SkyNet is a new general-purpose nuclear reaction networ…
View article: Signatures of hypermassive neutron star lifetimes on r-process nucleosynthesis in the disc ejecta from neutron star mergers
Signatures of hypermassive neutron star lifetimes on r-process nucleosynthesis in the disc ejecta from neutron star mergers Open
We investigate the nucleosynthesis of heavy elements in the winds ejected by accretion discs formed in neutron star mergers. We compute the element formation in disc outflows from hypermassive neutron star (HMNS) remnants of variable lifet…
View article: Neutrino-heated winds from millisecond protomagnetars as sources of the weak r-process
Neutrino-heated winds from millisecond protomagnetars as sources of the weak r-process Open
We explore heavy element nucleosynthesis in neutrino-driven winds from rapidly rotating,
\nstronglymagnetized protoneutron stars (‘millisecond protomagnetars’) forwhich themagnetic
\ndipole is aligned with the rotation axis, and the field …
View article: POST-OUTBURST RADIO OBSERVATIONS OF THE HIGH MAGNETIC FIELD PULSAR PSR J1119-6127
POST-OUTBURST RADIO OBSERVATIONS OF THE HIGH MAGNETIC FIELD PULSAR PSR J1119-6127 Open
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 evidence of significant radio emission, subsequent observation…
View article: The influence of neutrinos on r-process nucleosynthesis in the ejecta of black hole–neutron star mergers
The influence of neutrinos on r-process nucleosynthesis in the ejecta of black hole–neutron star mergers Open
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 rapidly synthesizes heavy nuclides as the material expands and co…
View article: Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code
Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code Open
We present results on the inspiral, merger, and postmerger evolution of a neutron star-neutron star (NSNS) system. Our results are obtained using the hybrid pseudospectral-finite volume Spectral Einstein Code (SpEC). To test our numerical …
View article: Dynamical mass ejection from binary neutron star mergers
Dynamical mass ejection from binary neutron star mergers Open
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 ejection from both quasi-circular and dynamical-capture ec…
View article: Gravitational waveforms for neutron star binaries from binary black hole simulations
Gravitational waveforms for neutron star binaries from binary black hole simulations Open
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-Wave Observatory. The tidal forces acting on the neutron s…