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Properties of the Binary Neutron Star Merger GW170817

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journal contribution
posted on 2023-05-21, 11:07 authored by Abbott, BP, Abbott, R, Karelle SiellezKarelle Siellez, Zweizig, J
On August 17, 2017, the Advanced LIGO and Advanced Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of the source of the gravitational-wave signal, GW170817, allowed electromagnetic observatories to identify NGC 4993 as the host galaxy. In this work, we improve initial estimates of the binary’s properties, including component masses, spins, and tidal parameters, using the known source location, improved modeling, and recalibrated Virgo data. We extend the range of gravitational-wave frequencies considered down to 23 Hz, compared to 30 Hz in the initial analysis. We also compare results inferred using several signal models, which are more accurate and incorporate additional physical effects as compared to the initial analysis. We improve the localization of the gravitational-wave source to a 90% credible region of 16  deg2. We find tighter constraints on the masses, spins, and tidal parameters, and continue to find no evidence for nonzero component spins.


Publication title

Physical Review X



Article number









School of Natural Sciences


American Physical Society

Place of publication

United States

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© 2019, The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License ( Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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