Full Transport General Relativistic Radiation Magnetohydrodynamics for Nucleosynthesis in Collapsars. (arXiv:1912.03378v2 [astro-ph.HE] UPDATED)

Full Transport General Relativistic Radiation Magnetohydrodynamics for Nucleosynthesis in Collapsars. (arXiv:1912.03378v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Miller_J/0/1/0/all/0/1">Jonah M. Miller</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sprouse_T/0/1/0/all/0/1">Trevor M. Sprouse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fryer_C/0/1/0/all/0/1">Christopher L. Fryer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ryan_B/0/1/0/all/0/1">Benjamin R. Ryan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dolence_J/0/1/0/all/0/1">Joshua C. Dolence</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mumpower_M/0/1/0/all/0/1">Matthew R. Mumpower</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Surman_R/0/1/0/all/0/1">Rebecca Surman</a>

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 $Y_{rm e} sim 0.3$ 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.

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