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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Nuclear Astrophysics III
HK 37.5: Vortrag
Mittwoch, 13. März 2024, 17:00–17:15, HBR 14: HS 1
Towards high resolution simulations of the ejecta of neutron star mergers — •Christian Schwebler1,2, Gabriel Martínez-Pinedo1,2,3, Andreas Bauswein1, and Oliver Just1 — 1GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64289 Darmstadt, Germany — 2Institut für Kernphysik (Theoriezentrum), Fachbereich Physik, Technische Universität Darmstadt, Schlossgartenstraße 2, 64289 Darmstadt, Germany — 3Helmholtz Forschungsakademie Hessen für FAIR, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
Binary neutron star mergers (BNS) are currently the most promising sites for r-process nucleosynthesis. To determine the nucleosynthesis yields and confront simulations to kilonova observations it is fundamental to have an accurate description of the ejecta properties. Typical hydrodynamical simulations cover the timescales tens of milliseconds after merger and suffer from limited resolution particularly in the ejecta. In order to evolve the ejecta for a longer time and improve their resolution, we have implemented in our smoothed-particle hydrodynamics code (SPH) an equation of state extended to low densities and a particle splitting technique that increases the effective resolution in the ejecta. Several tests of the implementation will be presented.
This project is supported and funded by the European Research Council(ERC) under the European Union`s Horizon research and innovation programme (ERC Advanced Grant KILONOVA No. 885281, ERC Grant HEAVYMETAL No. 101071865)
Keywords: neutron star mergers; r-process nucleosynthesis; kilonova