Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Nuclear Astrophysics I

HK 6.1: Gruppenbericht

Montag, 10. März 2025, 15:00–15:30, SR 0.03 Erw. Physik

Calibrated Nebular Emission Lines from Lanthanides — •Andreas Flörs¹, Ricardo Silva², and Gabriel Martínez-Pinedo¹ — ¹GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — ²Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Lisboa, Portugal

With the detection of multiple neutron-star merger events in the last few years, the need for a more comprehensive understanding of nuclear and atomic properties as well as radiative transfer has become increasingly important. Despite our current understanding, there are still large discrepancies in the opacities, leading to variations in the location and strength of spectral features in radiative transfer models and preventing a firm identification of r-process products.

We report on calibrated large-scale atomic structure calculations of all singly and doubly ionised lanthanides. We use the atomic structure to compute forbidden transitions, which become the main cooling mechanism after $sim$1 week in the evolution of the kilonova. Using these lines, we employ radiative transfer models to predict the nebular spectrum, which can be compared to observations with the JWST. We show that compared to early phase spectra, the nebular phase offers spatially separated features, which can be used to identify individual elements synthesised in the r-process.

AF and GMP acknowledge support by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (ERC Advanced Grant KILONOVA No. 885281) and the State of Hesse within the Cluster Project ELEMENTS.

Keywords: Neutron Star Merger; Kilonova; Atomic Data; NLTE; Radiative Transfer