Nucleosynthesis in Outflows from Black Hole–Neutron Star Merger Disks with Full GR(ν)RMHD

Curtis, Sanjana; Miller, Jonah M.; Fröhlich, Carla; Sprouse, Trevor; Lloyd-Ronning, Nicole; Mumpower, Matthew

doi:10.3847/2041-8213/acba16

Nucleosynthesis in Outflows from Black Hole–Neutron Star Merger Disks with Full GR(ν)RMHD

Journal Article · Fri Mar 03 00:00:00 EST 2023 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.3847/2041-8213/acba16· OSTI ID:1959857

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Abstract

Along with binary neutron star mergers, the inspiral and merger of a black hole and a neutron star is a predicted site of r -process nucleosynthesis and associated kilonovae. For the right mass ratio, very large amounts of neutron-rich material (relative to the dynamical ejecta) may become unbound from the post-merger accretion disk. We simulate a suite of four post-merger disks with three-dimensional general-relativistic magnetohydrodynamics with time-dependent Monte Carlo neutrino transport. We find that within 10 ⁴ GM _BH / c ³ (∼200–500 ms), the outflows from these disks are very close to the threshold conditions for robust r -process nucleosynthesis. For these conditions, the detailed properties of the outflow determine whether a full r -process can or cannot occur, implying that a wide range of observable phenomena is possible. We show that on average the disk outflow lanthanide fraction is suppressed relative to the solar isotopic pattern. In combination with the dynamical ejecta, these outflows imply a kilonova with both blue and red components.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: 89233218CNA000001; FG02-02ER41216

OSTI ID:: 1959857

Alternate ID(s):: OSTI ID: 2426511
OSTI ID: 2560043

Report Number(s):: LA-UR--22-32395

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Journal Issue: 1 Vol. 945; ISSN 2041-8205

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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