Apr
08
2021

Three-dimensional hydrodynamical simulations unravel the evolution of SN 1987A from the explosion to the supernova remnant (Opens in a new window)

IReNA Online Seminar

Seminars

Dr. Masaomi Ono

RIKEN

Abstract: Supernova 1987A (SN 1987A) provides a unique opportunity to unravel the  evolution of core-collapse supernovae (CCSNe) from the explosions to  their supernova remnants (SNRs) thanks to its proximity and youth. Early  observation of iron lines has indicated matter mixing during the  explosion to convey innermost 56Ni to outer layers. Since the density  structure of the progenitor star affects the matter mixing, it provides  a hint on the properties of the progenitor star.

Mar
26
2021

Constraining Tidal deformability from finite nuclei data, Bijay Agrawal (Saha Institute of Nuclear Physics) (Opens in a new window)

IReNA Online Seminar

Seminars
*Please note that this seminar will take place at 11:00am ET

Bijay Agrawal

Saha Institute of Nuclear Physics

The tidal deformability inferred from the Gravitational Waves, which are emitted by merging neutron stars, are instrumental in determining the equation of state (EoS) of dense matter. The importance of the observed finite nuclei properties in unveiling the correlations of the tidal deformability with the key EoS parameters will be discussed.

Mar
12
2021

The Unexamined Life: Implications for Mental Well-Being (Opens in a new window)

IReNA Online Seminar

Seminars

Marsha Carolan

Michigan State University

Abstract:

Are you connected with your “self”? with others? With your past and present?

In this presentation specially dedicated to graduate students and postdocs, we will explore linkages with mental well-being. There will be opportunities for discussion and questions.

Jan
29
2021

r-process nucleosynthesis and the production of heavy elements: A nuclear physics perspective (Opens in a new window)

IReNA Online Seminar

Seminars

Samuel Giuliani

(ECT*), Trento, Italy 

About half of the chemical elements heavier than iron that found in nature are produced during the rapid neutron-capture process (r process). In August 2017, the observation of the kilonova light curve, an electromagnetic transient produced by the radioactive decay of r-process nuclei synthesized during the merger of two neutron stars, marked the beginning of a new era for r-process studies where nucleosynthesis predictions can be directly confronted with astronomical observations.

Dec
11
2020

Nuclear-physics and multi-messenger constraints on the neutron-star equation of state (Opens in a new window)

IReNA Online Seminar

Seminars

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.

Nov
13
2020

The past, present, and future of r-process enhanced stars. (Opens in a new window)

IReNA Online Seminar

Seminars

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.

Oct
16
2020

Nucleosynthesis and observational evidences of magneto rotational driven supernovae (Opens in a new window)

IReNA Online Seminar

Seminars

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.

Oct
02
2020

Galactic archeology and the origin of the elements (Opens in a new window)

IReNA Online Seminar

Seminars

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.

Sep
04
2020

Core-Collapse Supernovae: From Neutrino-Driven 1D Explosions to Light Curves and Spectra (Opens in a new window)

IReNA Online Seminar

Seminars

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.

Aug
21
2020

New equations of state constrained by nuclear physics, observations, and high-density QCD calculations (Opens in a new window)

IReNA Online Seminar

Seminars

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.

Jun
19
2020

A halo of chemically primitive stars around an ancient dwarf galaxy. Online Seminar by Ani Chiti (MIT) (Opens in a new window)

IReNA Online Seminar

Seminars

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.