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GW170817: Measurements of neutron star radii and equation of state

Abbott, BP, Abbott, R, Siellez, K and Zweizig, J 2018 , 'GW170817: Measurements of neutron star radii and equation of state' , Physical Review Letters, vol. 121, no. 16 , pp. 1-16 , doi:

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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 Type: Article
Authors/Creators:Abbott, BP and Abbott, R and Siellez, K and Zweizig, J
Keywords: Neutron star, star radii, equation of tate, gravitational waves, neutron star binary system
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Soc
ISSN: 0031-9007
DOI / ID Number:
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© 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.

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