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  Post-merger evolution of a neutron star-black hole binary with neutrino transport

Foucart, F., O'Connor, E., Roberts, L., Duez, M. D., Haas, R., Kidder, L. E., et al. (2015). Post-merger evolution of a neutron star-black hole binary with neutrino transport. Physical Review D, 91: 124021. doi:10.1103/PhysRevD.91.124021.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0025-B8C7-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-9FBB-4
Genre: Journal Article

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 Creators:
Foucart, Francois, Author
O'Connor, Evan, Author
Roberts, Luke, Author
Duez, Matthew D., Author
Haas, Roland1, Author              
Kidder, Lawrence E., Author
Ott, Christian D., Author
Pfeiffer, Harald P., Author
Scheel, Mark A., Author
Szilagyi, Bela2, Author              
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We present a first simulation of the post-merger evolution of a black hole-neutron star binary in full general relativity using an energy-integrated general relativistic truncated moment formalism for neutrino transport. We describe our implementation of the moment formalism and important tests of our code, before studying the formation phase of a disk after a black hole-neutron star merger. We use as initial data an existing general relativistic simulation of the merger of a neutron star of 1.4 solar mass with a black hole of 7 solar mass and dimensionless spin a/M=0.8. Comparing with a simpler leakage scheme for the treatment of the neutrinos, we find noticeable differences in the neutron to proton ratio in and around the disk, and in the neutrino luminosity. We find that the electron neutrino luminosity is much lower in the transport simulations, and that the remnant is less neutron-rich. The spatial distribution of the neutrinos is significantly affected by relativistic effects. Over the short timescale evolved, we do not observe purely neutrino-driven outflows. However, a small amount of material (3e-4Msun) is ejected in the polar region during the circularization of the disk. Most of that material is ejected early in the formation of the disk, and is fairly neutron rich. Through r-process nucleosynthesis, that material should produce high-opacity lanthanides in the polar region, and could thus affect the lightcurve of radioactively powered electromagnetic transients. We also show that by the end of the simulation, while the bulk of the disk is neutron-rich, its outer layers have a higher electron fraction. As that material would be the first to be unbound by disk outflows on longer timescales, the changes in Ye experienced during the formation of the disk could have an impact on the nucleosynthesis outputs from neutrino-driven and viscously-driven outflows. [Abridged]

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 Dates: 2015-02-132015-06-11
 Publication Status: Published in print
 Pages: 29 pages, 25 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1502.04146
DOI: 10.1103/PhysRevD.91.124021
 Degree: -

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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 91 Sequence Number: 124021 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258