Erlangen 2026 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 2: Astrophysics II

EP 2.3: Vortrag

Montag, 16. März 2026, 16:45–17:00, KH 01.019

Accretion Regimes of Neutrino-Cooled Flows onto Black Holes — •Javiera Hernández Morales¹ and Daniel Siegel^1,2 — ¹University of Greifswald — ²University of Guelph

Neutrino-cooled accretion disks can form in the aftermath of neutron-star mergers as well as during the collapse of rapidly rotating massive stars and the accretion-induced collapse of rapidly rotating white dwarfs. At sufficiently high accretion rates, electrons present in the disk become degenerate, which leads to the neutronization of the accreting plasma and makes these astrophysical systems promising sources of rapid neutron-capture nucleosynthesis (the r-process). We present a one-dimensional, general-relativistic, viscous-hydrodynamic model of neutrino-cooled accretion disks around black holes. We chart the composition of the accretion flow and systematically explore a vast parameter space of accretion rates of Ṁ∼ 10⁻⁶−10⁶ M_⊙ s⁻¹, black hole masses of M_•∼ 1 − 10⁴ M_⊙, dimensionless spins of χ_•∈ [0,1), and α-viscosity values of α∼ 10⁻³−1. We find that outflows from such disks are promising sites for r-process nucleosynthesis up to M_• 3000 M_⊙. These give rise to lanthanide-bearing ‘red’ super-kilonovae transients mostly for M_• 200−500 M_⊙ and lanthanide-suppressed ‘blue’ super-kilonovae for larger M_•. Proton-rich outflows can develop specifically for large black hole masses (M_• 100 M_⊙) in certain accretion regimes, which may give rise to proton-rich isotopes via neutrino-induced proton-capture nucleosynthesis (the νp-process). We test some of these scenarios by following the trajectories of potential disk winds with the nuclear reaction network WinNet.

Keywords: Black holes; Compact objects; Nucleosynthesis; r-process; Accretion disks