Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 54: Cosmic rays 5
T 54.1: Talk
Wednesday, March 6, 2024, 16:00–16:15, Geb. 20.30: 2.059
Tidal Disruption Events as the origin of UHECR — •Pavlo Plotko1, Chengchao Yuan1, Cecilia Lunardini2, and Walter Winter1 — 1Deutsches Elektronen-Synchrotron DESY, Platanenallee 6, 15738 Zeuthen, Germany — 2Department of Physics, Arizona State University, 450 E. Tyler Mall, Tempe, AZ 85287-1504 USA
We present a detailed study of the contribution of Tidal Disruption Event (TDE) populations to the spectrum and composition of ultra-high-energy cosmic rays (UHECRs) and the corresponding neutrino flux. We categorize TDEs into three distinct populations: those similar to the AT2019dsg, AT2019fdr, and AT2019aalc events. We find that the dominant contribution to the UHECR and the neutrino flux at EeV energies comes from the aalc-like population. Additionally, we investigate various models of disrupted stars, including Main Sequence (MS), Red Super Giants (RSG), Wolf-Rayet (WR) stars, Carbon-Oxygen White Dwarfs (CO-WD), and Oxygen-Neon-Magnesium White Dwarfs (ONeMg-WD). Our findings indicate that an enhancement in the acceleration of heavy nuclei is essential to account for the observed composition data of UHECRs. We present predictions of the diffuse neutrino EeV fluxes observable by future neutrino observatories such as IceCube-Gen2, RNO-G, and GRAND.
Keywords: Tidal Disruption Event; ultra-high-energy cosmic rays; modeling; neutrino