Data
The Viability of Novae as Sources of Galactic Lithium featuring Alex Kemp (KU Leuven, Belgium) (Opens in a new window)
Understanding the behavior of white dwarfs in interacting binary systems is critical to determining the rates, distributions, and chemical contributions from transients such as novae and type Ia supernovae. In this talk I will be presenting results from my recent work on novae, which combines population synthesis (binary_c) and galactic chemical evolution modeling (OMEGA+).
Studying the origins of the heavy elements through neutron capture. Aaron Couture, LANL (Opens in a new window)
Understanding how the heavy elements came into being in the universe presents one of the greatest challenges in nuclear physics and astrophysics. For some time we have known that elements beyond iron on the periodic table must have been made through neutron-induced reactions, but the environments where they are made and what they can tell us about this history of our galaxy remain a mystery.
Neutron-upscattering enhancement of the triple-alpha process featuring Jack Bishop (Texas A&M University) (Opens in a new window)
Carbon is produced in stars mainly via the triple-alpha process where three helium nuclei fuse to form an excited state of carbon-12 known as the Hoyle state. This is a nuclear resonance (an excited form of a nucleus) that has properties that guide the rate that the triple alpha process takes place. Primarily, the key property is how often the Hoyle state is able to lose energy and end up in the ground state of carbon-12 – known as the radiative width.
Learning from cosmic gamma-ray spectroscopy featuring Roland Diehl (MPE, Germany) (Opens in a new window)
Gamma rays from nuclear lines are the most-direct astronomical messenger for the occurrence of nuclear reactions in cosmic sites, next to neutrinos.
Characteristic lines from radioactive decays have been measured with space-borne telescopes, most-recently with ESA’s INTEGRAL mission, for the isotopes 56Ni, 57Ni, 44Ti, 26Al, and 60Fe.
New Near-Infrared spectroscopic indices for unresolved stellar populations featuring Daniele Gasparri (Universidad de Atacama) (Opens in a new window)
In unresolved galaxies, age, metallicity, α/Fe enhancement of the stellar populations, as well as the IMF and the mass can be constrained via full spectra fitting or via line-strength index analysis. The Lick/IDS system is a prime example of line-strength spectroscopic indices that are sensitive to these parameters in the optical domain. In the Near-Infrared (NIR), where the upcoming generation of telescopes will primarily observe, we lack such a system, and the full spectral fitting technique is not yet reliable.
Getting Direct about Indirect Neutron-Capture Techniques featuring Andrea Richard (LLNL) (Opens in a new window)
Abstract: One of the biggest questions in nuclear astrophysics regards how elements are synthesized in stellar environments. Observations of astrophysical phenomena provide us with evidence for different nucleosynthesis processes, and modelling these astrophysical scenarios requires a detailed description of the complex nuclear physics that is involved.
'56Ni problem' in Canonical Supernova Explosion featuring Ryo Sawada (University of Tokyo) (Opens in a new window)
IReNA Online Seminar to begin 11am EST.
Stars that Freeze: White Dwarf Crystallization as Revealed by Gaia featuring Simon Blouin (University of Victoria) (Opens in a new window)
White dwarfs are stellar embers that simply cool down for the rest of time, eventually freezing into a solid state. This predictable evolution makes them precise cosmic clocks; they have been used for decades to measure the ages of stellar populations. But data from the Gaia space observatory is now calling into question the accuracy of this age dating technique. The cooling process appears to be much more delayed by the onset of crystallization than predicted by current models. I will present my recent work on the physics of core crystallization.
Multidimensional Modelling of Magnetic Fields in Supernovae and Their Progenitors featuring Vishnu Varma (Keele, UK) (Opens in a new window)
Core-collapse supernovae (CCSNe) are some of the brightest, most energetic events in the universe. In order to model these phenomena accurately, we need to have a diverse range of physics such as neutrino transport and neutrino interactions, general-relativistic gravity, detailed equations of state (EoS) of dense matter, magnetohydrodynamic (MHD) and detailed progenitor models.
The Contribution of Classical Novae to the Galactic Abundance of 26Al featuring Laetitia Canete (University of Surrey, UK) (Opens in a new window)
The discovery of radioactive 26Al via the observation of the 1809-keV γ ray in 1982 is one of the most famous pieces of evidence of on-going nucleosynthesis in the cosmos. The 26Al is likely to be produced dominantly in massive stars and supernovae. Nevertheless, a number of additional sources such as classical novae and AGB stars may still contribute considerably to the production of 26Al. Thus, up to 29% of the total observed 26Al abundance is predicted to have a nova origin.
High Precision Measurements to Probe the Physics of the Early Universe featuring Francesca Cavanna (INFN) (Opens in a new window)
Light elements were produced in the first few minutes of the Universe through a sequence of nuclear reactions known as Big Bang nucleosynthesis (BBN). Among the light elements produced during BBN, deuterium is an excellent indicator of cosmological parameters because its abundance is highly sensitive to the primordial baryon density.
IReNA Online Seminar featuring Michael Wiescher (Notre Dame) (Opens in a new window)
Title: The CNO cycle and the CNO Neutrinos in our Sun
IReNA Online Seminar featuring Jan Glorius (GSI) (Opens in a new window)
Title: Explosive nucleosynthesis with stored, radioactive ions
IReNA Online Seminar featuring Carolyn Raithel (Institute for Advanced Study) (Opens in a new window)
Title: Probing the Dense-Matter Equation of State with Neutron Star Mergers
IReNA Online Seminar featuring Laura Tolos (Institute of Space Sciences, ICE-CSIC) (Opens in a new window)
2pm Eastern Time / 7 pm CET. Host: Matt Caplan, Illinois State University
Title: Strangeness in the laboratory and stars
IReNA Online Seminar featuring Annika Lennarz (TRIUMF) (Opens in a new window)
Title: Nuclear Astrophysics with DRAGON
Abstract:
IReNA Online Seminar featuring Reed Essick (Perimeter Institute) (Opens in a new window)
Title: Gravitational Laboratories for Nuclear Physics
IReNA Online Seminar featuring Daid Kahl, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH) (Opens in a new window)
Title: Radioactive Nuclides in Outer Space
Abstract: Nuclear astrophysics is generally the study of the energy generation in stars and the origins of the chemical elements. In this highly multidisciplinary field, the job of experimental nuclear physicists is to constrain the nuclear reaction rates which are linked with astronomical observables. Observation of the lightest chemical element with no stable isotopes, technetium, in stellar spectra, was the first evidence that nucleosynthesis is an on-going process in our Galaxy.
IReNA Online Seminar featuring Tilman Hartwig (University or Tokyo) (Opens in a new window)
Title: Stellar Archaeology as a Time Machine to the First Stars
IReNA Online Seminar featuring Arthur Choplin (University libre de Bruxelles) (Opens in a new window)
Title : Non-standard neutron capture processes in massive and AGB stars