Ingo Tews

Los Alamos National Laboratory

Neutron stars contain the largest reservoirs of degenerate fermions, reaching the highest densities we can observe in the cosmos, and probe matter under conditions that cannot be recreated in terrestrial experiments. Throughout the Universe, a large number of high-energy, cataclysmic astrophysical collisions of neutron stars are continuously occurring.

Terese Hansen

Texas A&M University

A small fraction of old, metal-poor stars exhibits large enhancements in elements produced in the rapid neutron capture (r-)process. Their chemical composition, mapped through detailed abundance analysis, is a direct fingerprint of the elements produced in the stellar generation before them. This makes them excellent laboratories for studying the r-process. The first r-process enhanced star was discovered over 30 years ago. Since then, about 30 highly r-process enhances stars have been found in the Milky Way halo.

Mortiz Reichert

TU Darmstadt

Abstract: About half of the heavy elements in our Universe are synthesized by one process, the rapid neutron capture process (r-process). This process requires extreme and violent environments that achieve the necessary neutron-rich conditions. Neutron star mergers and magneto rotational driven supernovae are promising candidates to host the r-process. We investigate the r-process from an observational as well as a nucleosynthesis point of view.

Chiaki Kobayashi

University of Hertfordshire

Abstract: Galactic chemical evolution (GCE) can provide stringent constraints not only on nuclear astrophysics but also on the formation and evolutionary history of the Milky Way itself, through an approach called Galactic archeology.

Jaspreet Randhawa

University of Notre Dame

Abstract: Type-I X-ray bursts (XRBs) are among the most frequent thermonuclear explosions in the Universe. Detailed models are required to constrain the mass-radius relation and other underlying physics through comparisons between the observations and models.

Sanjana Curtis

North Carolina State University

Abstract: The number of observed core-collapse supernova lightcurves is growing every day, providing valuable clues about progenitors, stellar evolution, the explosion mechanism, the nuclear equation of state, nucleosynthesis, and the formation of neutron stars and black holes. However, interpreting electromagnetic observables correctly is a formidable challenge, one that requires detailed and accurate theoretical modeling.

Sabrina Huth 

TU Darmstadt

Abstract: We present new equations of state for applications in core-collapse supernova and neutron star merger simulations. We start by introducing an effective mass parametrization that is fit to recent microscopic calculations up to twice saturation density. This is important to capture the predicted thermal effects, which have been shown to determine the proto-neutron star contraction in supernova simulations.

The Seminar will begin at 2pm EST Online Seminar featuring Benoit Cote (Konkoly Observatory)

The Milky Way is surrounded by dozens of ultra-faint dwarf galaxies. These systems are the remnants of the earliest galaxies, and spectroscopy of their stars thereby reveals the elements produced by chemical evolution in a primitive, self-contained environment. Previous spectroscopic studies, however, had largely been limited to stars within the core of these galaxies (~2 half-light radii) due to the sparseness of their distant stars.

Abstract:

The fusion reaction of carbon and helium to oxygen is the key to understanding the evolution of stars and the relative abundances of both elements. The reaction rate of ¹²C(a,g)¹⁶O has to be known with an uncertainty of lower than 10% at a center-of-mass energy of 300 keV during Helium burning conditions. So far, experiments have studied the reaction down to about 1 MeV.

The Seminar will begin at 2pm EST Online Seminar featuring Donna Dean (American Chemical Society).

Abstract:

In the second webinar, mentoring approaches will be addressed for both mentors and mentees.  Factors that may impact the mentoring relationship and key topics and questions for mentoring discussions will be covered.

The content of each webinar should help participants reflect on past experiences and understand how they can build and sustain more effective mentoring relationships in the future. 

The Seminar will begin at 2pm EST Online Seminar featuring Donna Dean (American Chemical Society).

Abstract:

The first webinar will focus on tools, techniques, and strategies to seek out appropriate mentors for strong mentoring relationships. . The do's and don'ts involved for mentees and mentors will be covered.  

The content of each webinar should help participants reflect on past experiences and understand how they can build and sustain more effective mentoring relationships in the future. 

Rana Ezzeddine (University of Florida)

Abstract:

Abstract: Over the next decade, neutrino astronomy will probe the rich astrophysics of neutrino production in the sky, including neutrinos from the Sun, core-collapse supernova (e.g., SN 1987A), and relativistic jets (e.g., blazar TXS 0506+056). On the observational side of this new era, the Super-Kamiokande with Gadolinium, Jiangmen Underground Neutrino Observatory, XENON, and future liquid scintillator neutrino experiments usher in a new generation of multi-purpose neutrino detectors designed to open new avenues for potentially observing currently undetected neutrinos.

Presented by Ermal Rrapaj from the University of Minnesota

Abstract: I study the flavor evolution of a dense neutrino gas by considering vacuum contributions, mat-ter effects and neutrino self-interactions. Assuming a system of two flavors in a uniform matter background, the time evolution of the many-body system in discretized momentum space is com-puted. The multi-angle neutrino-neutrino interactions are treated exactly and compared to both the single-angle approximation and mean field calculations.  I study various configurations of up to twenty neutrinos.

Max Planck Institute for Astronomy, Heidelberg

Title TBA

Alexander Ji. Carnegie Science Observatories

The lanthanide fraction distribution in r-process metal-poor stars

Abstract:

Dan Siegel from Columbia University gives a talk.

Title: R-process nucleosynthesis in neutron star mergers and collapsars

Gina Duggan from Caltech gives an online seminar "Galactic Chemical Evolution Model Provides Quantitative Constraints on the r-process in Dwarf Galaxies"

Wei Jia Ong

Lawrence Livermore National Laboratory