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T: Fachverband Teilchenphysik

T 23: Hauptvorträge (Invited Talks) I

T 23.3: Hauptvortrag

Dienstag, 16. März 2021, 11:45–12:30, Audimax

Cosmic Nucleosynthesis, a Multi-Messenger Challenge — •Roland Diehl — Max Planck Institut für extraterrestrische Physik, Garching, Germany

The origin of cosmic elements and isotopes is one of the fundamental questions in astrophysics. Identifying signatures clearly attributed to specific atomic or nuclear species is the main tool of the associated astronomy, and commonly applied to starlight. In stellar explosions, gas however is highly ionized and not in thermal equilibrium, making identifications more challenging. Moreover, nucleosynthesis in stars and explosions occurs through reactions among often unstable isotopes, and elemental information is ambiguous. In this talk, we review the astronomical messengers towards an understanding of cosmic nucleosynthesis, in their diversity. Observations of cosmic nucleosynthesis, direct and less direct, in gaseous and solid materials will be compared. The decay of unstable isotopes that are ejected from such sources provides a new tool from gamma-ray spectroscopy; more-common optical spectra, but also stardust or cosmic ray compositions within the solar system can be analysed with high precision, but are also offset in time and space from the nucleosynthesis event. We will discuss how these multiple messengers of cosmic nucleosynthesis complement each other, addressing specific events such as the kilonova/gravitational-wave event GW170817, and examples of core-collapse and type Ia supernovae.