International Symposium on Nuclei in the Cosmos XVIII (NIC XVIII)

Session

Stellar Evolution II – Supernovae, Kilonovae, Mergers, R- and P-Process

18 Jun 2025, 09:45

Girona

269. Nucleosynthesis in core-collapse supernovae

Almudena Arcones (TU Darmstadt & GSI)

18/06/2025, 09:45

Invited Review Talk

Core-collapse supernovae play a central role in the chemical evolution of the universe. They eject the elements synthesised during the life of massive stars and produce heavy elements. There have been major advances in the hydrodynamical simulations and in the microphysics included (neutrinos and high density equation of state), in galactic chemical evolution models, and in observations of old...

261. Neutron Star Mergers and Kilonovae: r-Process and Gravitational Waves

Mr Andreas Bauswein (GSI Darmstadt)

18/06/2025, 10:15

Invited Review Talk

Neutron star mergers are the prime example for multi-messenger events with the potential to address many open questions with regards to nucleosynthesis of heavy elements and the properties of high-density matter. This concerns for instance the composition of the outflows and to which extent they resemble the solar abundance pattern. Also, the existence of non-nucleonic degrees of freedom in...

234. 3D Simulations of White Dwarf-Main Sequence Star Collisions

Christian J. T. van der Merwe (University of Cape Town, South Africa, and 2South African Astronomical Observatory,)

19/06/2025, 08:30

Contributed Talk

Stellar collisions have garnered renewed attention for their role in the formation of peculiar objects, such as blue stragglers, and their potential to explain explosive transients with atypical observational and spectroscopic signatures. Among these, white dwarf-main sequence (WD-MS) collisions are particularly intriguing due to the diverse evolutionary pathways they can produce—ranging from...

177. Probing Pair-Instability Supernovae via 56Ni Decay Signatures

RYO SAWADA (The Institute for Cosmic Ray Research, UT)

19/06/2025, 08:45

Contributed Talk

Pair-instability supernovae (PISNe) are theorized thermonuclear explosions of extremely massive stars, predicted to occur when the helium core mass exceeds ∼65M⊙. The large amounts of radioactive 56 Ni synthesized in such events (∼60M⊙ in extreme cases) can power extraordinarily luminous optical light curves, but to date no supernova has been definitively confirmed as a PISN. Direct...

86. Trans-Fe elements from Type Ia Supernovae

Umberto Battino (University of Naples "Federico II")

19/06/2025, 09:00

Contributed Talk

A Type Ia supernova (SNIa) marks the catastrophic explosion of a white dwarf in a binary system. These events play a crucial role in galactic chemical evolution and serve as pivotal standardizable candles for measuring cosmic distances, underpinning the discovery of the Universe's accelerated expansion. However, the progenitors of SNIa remain uncertain, introducing challenges to their use in...

52. Neutrino-Mass Hierarchy and The Roles of Radioactive Nuclear Reactions in Explosive Nucleosynthesis of Supernovae, Collapsars and Mergers

Toshitaka Kajino (Beihang University, University of Tokyo, National Astronomical Observatory of Japan)

19/06/2025, 09:15

Contributed Talk

The detection of gravitational waves from the binary neutron star merger GW170817 and supernova (SN) neutrinos from SN1987A opened a new era of multi-messenger astronomy and astrophysics, and we are able to understand the cosmic chemical evolution with these events to seek for the origin and evolution of atomic nuclei. A keen scientific objective is to understand how the strong,...