AT2017gfo: Bayesian inference and model selection of multicomponent kilonovae and constraints on the neutron star equation of state
Abstract
The joint detection of the gravitational wave GW170817, of the short γ-ray burst GRB170817A and of the kilonova AT2017gfo, generated by the the binary neutron star (NS) merger observed on 2017 August 17, is a milestone in multimessenger astronomy and provides new constraints on the NS equation of state. We perform Bayesian inference and model selection on AT2017gfo using semi-analytical, multicomponents models that also account for non-spherical ejecta. Observational data favour anisotropic geometries to spherically symmetric profiles, with a log-Bayes’ factor of ~104, and favour multicomponent models against single-component ones. The best-fitting model is an anisotropic three-component composed of dynamical ejecta plus neutrino and viscous winds. Using the dynamical ejecta parameters inferred from the best-fitting model and numerical–relativity relations connecting the ejecta properties to the binary properties, we constrain the binary mass ratio to q < 1.54 and the reduced tidal parameter to $$120\lt \tilde{\Lambda }\lt 1110$$. Finally, we combine the predictions from AT2017gfo with those from GW170817, constraining the radius of a NS of 1.4 M⊙ to 12.2 ± 0.5 km (1σ level). This prediction could be further strengthened by improving kilonova models with numerical-relativity information.
- Authors:
-
[1];
[1];
[3];
[1];
- Friedrich Schiller Univ., Jena (Germany)
- Univ. of Trento (Italy); Trento Institute for Fundamental Physics and Applications (Italy)
- Univ. of Pisa (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Pisa (Italy)
- Pennsylvania State Univ., University Park, PA (United States)
- Gran Sasso Science Institute, L'aquila (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Perugia (Italy); Istituto Nazionale di Astrofisica (INAF), Teramo (Italy). Observatory of Abruzzo
- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); European Union (EU); DFG
- OSTI Identifier:
- 1865193
- Grant/Contract Number:
- SC0021177; BinGraSp-714626; PHY-2011725; INST-275/334-1 FUGG; INST-275/363-1 FUGG
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 505; Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; transients; neutron star mergers; methods; data analysis; equation of state
Citation Formats
Breschi, Matteo, Perego, Albino, Bernuzzi, Sebastiano, Del Pozzo, Walter, Nedora, Vsevolod, Radice, David, and Vescovi, Diego. AT2017gfo: Bayesian inference and model selection of multicomponent kilonovae and constraints on the neutron star equation of state. United States: N. p., 2021.
Web. doi:10.1093/mnras/stab1287.
Breschi, Matteo, Perego, Albino, Bernuzzi, Sebastiano, Del Pozzo, Walter, Nedora, Vsevolod, Radice, David, & Vescovi, Diego. AT2017gfo: Bayesian inference and model selection of multicomponent kilonovae and constraints on the neutron star equation of state. United States. https://doi.org/10.1093/mnras/stab1287
Breschi, Matteo, Perego, Albino, Bernuzzi, Sebastiano, Del Pozzo, Walter, Nedora, Vsevolod, Radice, David, and Vescovi, Diego. Wed .
"AT2017gfo: Bayesian inference and model selection of multicomponent kilonovae and constraints on the neutron star equation of state". United States. https://doi.org/10.1093/mnras/stab1287. https://www.osti.gov/servlets/purl/1865193.
@article{osti_1865193,
title = {AT2017gfo: Bayesian inference and model selection of multicomponent kilonovae and constraints on the neutron star equation of state},
author = {Breschi, Matteo and Perego, Albino and Bernuzzi, Sebastiano and Del Pozzo, Walter and Nedora, Vsevolod and Radice, David and Vescovi, Diego},
abstractNote = {The joint detection of the gravitational wave GW170817, of the short γ-ray burst GRB170817A and of the kilonova AT2017gfo, generated by the the binary neutron star (NS) merger observed on 2017 August 17, is a milestone in multimessenger astronomy and provides new constraints on the NS equation of state. We perform Bayesian inference and model selection on AT2017gfo using semi-analytical, multicomponents models that also account for non-spherical ejecta. Observational data favour anisotropic geometries to spherically symmetric profiles, with a log-Bayes’ factor of ~104, and favour multicomponent models against single-component ones. The best-fitting model is an anisotropic three-component composed of dynamical ejecta plus neutrino and viscous winds. Using the dynamical ejecta parameters inferred from the best-fitting model and numerical–relativity relations connecting the ejecta properties to the binary properties, we constrain the binary mass ratio to q < 1.54 and the reduced tidal parameter to $120\lt \tilde{\Lambda }\lt 1110$. Finally, we combine the predictions from AT2017gfo with those from GW170817, constraining the radius of a NS of 1.4 M⊙ to 12.2 ± 0.5 km (1σ level). This prediction could be further strengthened by improving kilonova models with numerical-relativity information.},
doi = {10.1093/mnras/stab1287},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 505,
place = {United States},
year = {Wed May 12 00:00:00 EDT 2021},
month = {Wed May 12 00:00:00 EDT 2021}
}
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journal, November 2019
- Nedora, Vsevolod; Bernuzzi, Sebastiano; Radice, David
- The Astrophysical Journal, Vol. 886, Issue 2
Systematics of Dynamical mass Ejection, Nucleosynthesis, and Radioactively Powered Electromagnetic Signals from Neutron-Star Mergers
journal, July 2013
- Bauswein, A.; Goriely, S.; Janka, H. -T.
- The Astrophysical Journal, Vol. 773, Issue 1
Full transport model of GW170817-like disk produces a blue kilonova
journal, July 2019
- Miller, Jonah M.; Ryan, Benjamin R.; Dolence, Joshua C.
- Physical Review D, Vol. 100, Issue 2
Diversity of Kilonova Light Curves
journal, February 2020
- Kawaguchi, Kyohei; Shibata, Masaru; Tanaka, Masaomi
- The Astrophysical Journal, Vol. 889, Issue 2
Viscous-dynamical Ejecta from Binary Neutron Star Mergers
journal, December 2018
- Radice, David; Perego, Albino; Hotokezaka, Kenta
- The Astrophysical Journal, Vol. 869, Issue 2
INTEGRAL Detection of the First Prompt Gamma-Ray Signal Coincident with the Gravitational-wave Event GW170817
journal, October 2017
- Savchenko, V.; Ferrigno, C.; Kuulkers, E.
- The Astrophysical Journal, Vol. 848, Issue 2
-process nucleosynthesis from matter ejected in binary neutron star mergers
journal, December 2017
- Bovard, Luke; Martin, Dirk; Guercilena, Federico
- Physical Review D, Vol. 96, Issue 12
The Combined Ultraviolet, Optical, and Near-infrared Light Curves of the Kilonova Associated with the Binary Neutron Star Merger GW170817: Unified Data Set, Analytic Models, and Physical Implications
journal, December 2017
- Villar, V. A.; Guillochon, J.; Berger, E.
- The Astrophysical Journal, Vol. 851, Issue 1
The r-process nucleosynthesis during the decompression of neutron star crust material
journal, January 2016
- Goriely, S.; Bauswein, A.; Janka, H-T
- Journal of Physics: Conference Series, Vol. 665
Neutrino-driven winds from binary neutron star mergers
text, January 2015
- Perego, A.; Arcones, A.
- GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt