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GW170817: Measurements of neutron star radii and equation of state


Abbott, BP and Abbott, R and Siellez, K and Zweizig, J and The LIGO Scientific Collaboration and the Virgo Collaboration, GW170817: Measurements of neutron star radii and equation of state, Physical Review Letters, 121, (16) Article 161101. ISSN 0031-9007 (2018) [Refereed Article]

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Copyright Statement

2018 American Physical Society. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License ( The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. Must link to published article.

DOI: doi:10.1103/PhysRevLett.121.161101


On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitational-wave signal, GW170817, offers a novel opportunity to directly probe the properties of matter at the extreme conditions found in the interior of these stars. The initial, minimal-assumption analysis of the LIGO and Virgo data placed constraints on the tidal effects of the coalescing bodies, which were then translated to constraints on neutron star radii. Here, we expand upon previous analyses by working under the hypothesis that both bodies were neutron stars that are described by the same equation of state and have spins within the range observed in Galactic binary neutron stars. Our analysis employs two methods: the use of equation-of-state-insensitive relations between various macroscopic properties of the neutron stars and the use of an efficient parametrization of the defining function p(ρ) of the equation of state itself.

Item Details

Item Type:Refereed Article
Keywords:Neutron star, star radii, equation of tate, gravitational waves, neutron star binary system
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:General relativity and gravitational waves
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Siellez, K (Dr Karelle Siellez)
ID Code:151973
Year Published:2018
Web of Science® Times Cited:512
Deposited By:Physics
Deposited On:2022-08-09
Last Modified:2022-09-27
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