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SYAD: Symposium SAMOP Dissertation Prize 2025
SYAD 1: SAMOP Dissertation Prize Symposium
SYAD 1.4: Hauptvortrag
Montag, 10. März 2025, 16:00–16:30, HS 1+2
Interstellar stardust from stellar explosions recorded in a deep-ocean ferromanganese crust within the last 10 million years — •Dominik Koll — Australian National University, Canberra, Australia — TUD Dresden University of Technology, Dresden, Germany — Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Stars are the element factories in the universe. Stellar explosions eject freshly synthesized radionuclides into interstellar space which subsequently can be accreted by Earth. These radionuclides are the fingerprints of stellar nucleosynthesis.
In this work, I characterized a 10-million year old ferromanganese crust from the bottom of the Central Pacific and chemically extracted single atoms of live interstellar radionuclides 60Fe, 244Pu and 247Cm for accelerator mass spectrometry. The dating of the crust with cosmogenic 10Be led to the discovery of an unexpected anomaly during the late Miocene, which has the potential to be used as a new dating anchor on the Myr timescale for deep-ocean archives.
Highly time-resolved profiles of supernova 60Fe and r-process 244Pu and 247Cm revealed two influxes of supernova-produced interstellar stardust within the last 10 Myr. The influx profile of 244Pu and 247Cm constrain the last r-process event in the Milky Way.
Keywords: AMS; Nucleosynthesis; Interstellar Dust; Supernova; Ferromanganese Crust