2019/12/31 by Jonah M. Miller, Trevor M. Sprouse, Christopher L. Fryer +4 · 2 citations
Physics and Astronomy · #astro-ph.HE #gr-qc
paper · pdf · doi:10.3847/1538-4357/abb4e3
19 pages, 22 figures. Accepted in ApJ
arxiv created 2020/09/02 · arxiv updated 2020/10/21
We model a compact black hole-accretion disk system in the collapsar scenario with full transport, frequency dependent, general relativistic radiation magnetohydrodynamics. We examine whether or not winds from a collapsar disk can undergo rapid neutron capture (r-process) nucleosynthesis and significantly contribute to solar r-process abundances. We find the inclusion of accurate transport has significant effects on outflows, raising the electron fraction above Y\rm e ∼ 0.3 and preventing third peak r-process material from being synthesized. We analyze the time-evolution of neutrino processes and electron fraction in the disk and present a simple one-dimensional model for the vertical structure that emerges. We compare our simulation to semi-analytic expectations and argue that accurate neutrino transport and realistic initial and boundary conditions are required to capture the dynamics and nucleosynthetic outcome of a collapsar.