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Dynamical Mass Ejection from Binary Neutron Star Mergers

Radice, David and Galeazzi, Filippo and Lippuner, Jonas and Roberts, Luke F. and Ott, Christian D. and Rezzolla, Luciano (2016) Dynamical Mass Ejection from Binary Neutron Star Mergers. Monthly Notices of the Royal Astronomical Society, 460 (3). pp. 3255-3271. ISSN 0035-8711. doi:10.1093/mnras/stw1227.

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We present fully general-relativistic simulations of binary neutron star mergers with a temperature and composition dependent nuclear equation of state. We study the dynamical mass ejection from both quasi-circular and dynamical-capture eccentric mergers. We systematically vary the level of our treatment of the microphysics to isolate the effects of neutrino cooling and heating and we compute the nucleosynthetic yields of the ejecta. We find that eccentric binaries can eject significantly more material than quasi-circular binaries and generate bright infrared and radio emission. In all our simulations the outflow is composed of a combination of tidally- and shock-driven ejecta, mostly distributed over a broad ∼60∘ angle from the orbital plane, and, to a lesser extent, by thermally driven winds at high latitudes. Ejecta from eccentric mergers are typically more neutron rich than those of quasi-circular mergers. We find neutrino cooling and heating to affect, quantitatively and qualitatively, composition, morphology, and total mass of the outflows. This is also reflected in the infrared and radio signatures of the binary. The final nucleosynthetic yields of the ejecta are robust and insensitive to input physics or merger type in the regions of the second and third r-process peaks. The yields for elements on the first peak vary between our simulations, but none of our models is able to explain the Solar abundances of first-peak elements without invoking additional first-peak contributions from either neutrino and viscously-driven winds operating on longer timescales after the mergers, or from core-collapse supernovae.

Item Type:Article
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URLURL TypeDescription Paper
Radice, David0000-0001-6982-1008
Lippuner, Jonas0000-0002-5936-3485
Roberts, Luke F.0000-0001-7364-7946
Ott, Christian D.0000-0003-4993-2055
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 May 18. Received 2016 May 18. In original form 2016 January 11. First published online May 23, 2016. We thank S. Bernuzzi, S. Richers, and S. Rosswog for useful discussions, and the anonymous referee for comments that have improved the paper. This research was partially supported by the Sherman Fairchild Foundation, by NSF under award nos. CAREER PHY-1151197, PHY-1404569, and AST-1333520, and by ‘NewCompStar’, COST Action MP1304. FG is supported by the Helmholtz International Center for FAIR within the framework of the LOEWE programme launched by the State of Hesse. Support for LFR during this work was provided by NASA through an Einstein Postdoctoral Fellowship grant numbered PF3-140114 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. The simulations were performed on the Caltech compute cluster Zwicky (NSF MRI-R2 award no. PHY-0960291), on SuperMUC at the LRZ in Garching, on the NSF XSEDE network under allocation TG-PHY100033, on LOEWE in Frankfurt, and on NSF/NCSA BlueWaters under NSF PRAC award no. ACI-1440083.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
European Cooperation in Science and Technology (COST)MP1304
NASA Einstein Postdoctoral FellowshipPF3-140114
Subject Keywords:gravitational waves hydrodynamics neutrinos nuclear reactions, nucleosynthesis, abundances methods: numerical stars: neutron
Issue or Number:3
Record Number:CaltechAUTHORS:20160912-101351820
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Official Citation:David Radice, Filippo Galeazzi, Jonas Lippuner, Luke F. Roberts, Christian D. Ott, and Luciano Rezzolla Dynamical mass ejection from binary neutron star mergers MNRAS (August 11, 2016) Vol. 460 3255-3271 doi:10.1093/mnras/stw1227 first published online May 23, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70279
Deposited By: Tony Diaz
Deposited On:12 Sep 2016 18:15
Last Modified:11 Nov 2021 04:26

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