Viscous-dynamical Ejecta from Binary Neutron Star Mergers
Abstract
General-relativistic simulations of binary neutron star (NS) mergers with viscosity reveal a new outflow mechanism operating in unequal mass binaries on dynamical timescales and enabled by turbulent viscosity. These "viscous-dynamical" ejecta are launched during the merger due to the thermalization of mass exchange streams between the secondary and the primary NS. They are characterized by asymptotic velocities extending up to ~0.8c, and have masses that depend on the efficiency of the viscous mechanism. Depending on the unknown strength of the effective viscosity arising from magnetohydrodynamic instabilities operating during the merger, the overall mass of the dynamical ejecta could be enhanced by a factor of a few and the mass of the fast tail of the ejecta, having asymptotic velocities ≥0.6c, by up to four orders of magnitude. The radioactive decay of the expanding viscous-dynamical ejecta could produce bright kilonova transients with signatures of free neutron decay in the first hour, and enhanced near-infrared flux on a timescale of a few days. The synchrotron remnant produced by the interaction between the ejecta and the interstellar medium could also be significantly enhanced by viscosity. Such a remnant could be detected in the case of GW170817 as a rebrightening of the radio signalmore »
- Authors:
-
[1];
[2];
[3];
[4];
- Institute for Advanced Study, Princeton, NJ (United States); Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences
- Istituto Nazionale di Fisica Nucleare (INFN), Parma (Italy); Univ. degli Studi di Milano (Italy)
- Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences
- Istituto Nazionale di Fisica Nucleare (INFN), Parma (Italy); Friedrich Schiller Univ., Jena (Germany)
- Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- Michigan State Univ., East Lansing, MI (United States); Krell Institute, Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1612795
- Grant/Contract Number:
- SC0017955; SC0019323
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal. Letters (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal. Letters (Online); Journal Volume: 869; Journal Issue: 2; Journal ID: ISSN 2041-8213
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics
Citation Formats
Radice, David, Perego, Albino, Hotokezaka, Kenta, Bernuzzi, Sebastiano, Fromm, Steven A., and Roberts, Luke F. Viscous-dynamical Ejecta from Binary Neutron Star Mergers. United States: N. p., 2018.
Web. doi:10.3847/2041-8213/aaf053.
Radice, David, Perego, Albino, Hotokezaka, Kenta, Bernuzzi, Sebastiano, Fromm, Steven A., & Roberts, Luke F. Viscous-dynamical Ejecta from Binary Neutron Star Mergers. United States. https://doi.org/10.3847/2041-8213/aaf053
Radice, David, Perego, Albino, Hotokezaka, Kenta, Bernuzzi, Sebastiano, Fromm, Steven A., and Roberts, Luke F. Wed .
"Viscous-dynamical Ejecta from Binary Neutron Star Mergers". United States. https://doi.org/10.3847/2041-8213/aaf053. https://www.osti.gov/servlets/purl/1612795.
@article{osti_1612795,
title = {Viscous-dynamical Ejecta from Binary Neutron Star Mergers},
author = {Radice, David and Perego, Albino and Hotokezaka, Kenta and Bernuzzi, Sebastiano and Fromm, Steven A. and Roberts, Luke F.},
abstractNote = {General-relativistic simulations of binary neutron star (NS) mergers with viscosity reveal a new outflow mechanism operating in unequal mass binaries on dynamical timescales and enabled by turbulent viscosity. These "viscous-dynamical" ejecta are launched during the merger due to the thermalization of mass exchange streams between the secondary and the primary NS. They are characterized by asymptotic velocities extending up to ~0.8c, and have masses that depend on the efficiency of the viscous mechanism. Depending on the unknown strength of the effective viscosity arising from magnetohydrodynamic instabilities operating during the merger, the overall mass of the dynamical ejecta could be enhanced by a factor of a few and the mass of the fast tail of the ejecta, having asymptotic velocities ≥0.6c, by up to four orders of magnitude. The radioactive decay of the expanding viscous-dynamical ejecta could produce bright kilonova transients with signatures of free neutron decay in the first hour, and enhanced near-infrared flux on a timescale of a few days. The synchrotron remnant produced by the interaction between the ejecta and the interstellar medium could also be significantly enhanced by viscosity. Such a remnant could be detected in the case of GW170817 as a rebrightening of the radio signal in the next months to years.},
doi = {10.3847/2041-8213/aaf053},
journal = {The Astrophysical Journal. Letters (Online)},
number = 2,
volume = 869,
place = {United States},
year = {Wed Dec 19 00:00:00 EST 2018},
month = {Wed Dec 19 00:00:00 EST 2018}
}
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- Margalit, Ben; Metzger, Brian D.
- The Astrophysical Journal, Vol. 880, Issue 1
Two Years of Nonthermal Emission from the Binary Neutron Star Merger GW170817: Rapid Fading of the Jet Afterglow and First Constraints on the Kilonova Fastest Ejecta
journal, November 2019
- Hajela, A.; Margutti, R.; Alexander, K. D.
- The Astrophysical Journal, Vol. 886, Issue 1
Neutron star binary orbits in their host potential: effect on early r-process enrichment
journal, September 2019
- Bonetti, Matteo; Perego, Albino; Dotti, Massimo
- Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 1
Neutrino-dominated Accretion Flows with Magnetic Prandtl Number-dependent MRI-driven Turbulence
journal, August 2019
- Kawanaka, Norita; Masada, Youhei
- The Astrophysical Journal, Vol. 881, Issue 2
Spiral-wave Wind for the Blue Kilonova
journal, November 2019
- Nedora, Vsevolod; Bernuzzi, Sebastiano; Radice, David
- The Astrophysical Journal, Vol. 886, Issue 2
A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
journal, December 2019
- Riley, T. E.; Watts, A. L.; Bogdanov, S.
- The Astrophysical Journal, Vol. 887, Issue 1
Jet–Cocoon Outflows from Neutron Star Mergers: Structure, Light Curves, and Fundamental Physics
journal, August 2019
- Lazzati, Davide; Perna, Rosalba
- The Astrophysical Journal, Vol. 881, Issue 2
Observable features of GW170817 kilonova afterglow
journal, June 2019
- Kathirgamaraju, Adithan; Giannios, Dimitrios; Beniamini, Paz
- Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 3
GW170817$-$the first observed neutron star merger and its kilonova: implications for the astrophysical site of the r-process
text, January 2019
- Siegel, Daniel M.
- arXiv
Neutrino-Dominated Accretion Flows with Magnetic Prandtl Number-Dependent MRI-driven Turbulence
text, January 2019
- Kawanaka, Norita; Masada, Youhei
- arXiv
Light-curve models of black hole - neutron star mergers: steps towards a multi-messenger parameter estimation
text, January 2019
- Barbieri, C.; Salafia, O. S.; Perego, A.
- arXiv
Jet-cocoon outflows from neutron star mergers: structure, light curves, and fundamental physics
text, January 2019
- Lazzati, Davide; Perna, Rosalba
- arXiv
The Multi-Messenger Matrix: the Future of Neutron Star Merger Constraints on the Nuclear Equation of State
text, January 2019
- Margalit, Ben; Metzger, Brian D.
- arXiv
Neutron star binary orbits in their host potential: effect on early r-process enrichment
text, January 2019
- Bonetti, Matteo; Perego, Albino; Dotti, Massimo
- arXiv
Electromagnetic counterparts of black hole-neutron star mergers: dependence on the neutron star properties
text, January 2019
- Barbieri, C.; Salafia, O. S.; Perego, A.
- arXiv