New Constraints on Radii and Tidal Deformabilities of Neutron Stars from GW170817

Physical Review Letters
Elias R MostJ Schaffner-Bielich

Abstract

We explore in a parameterized manner a very large range of physically plausible equations of state (EOSs) for compact stars for matter that is either purely hadronic or that exhibits a phase transition. In particular, we produce two classes of EOSs with and without phase transitions, each containing one million EOSs. We then impose constraints on the maximum mass (M<2.16  M_{⊙}) and on the dimensionless tidal deformability (Λ[over ˜]<800) deduced from GW170817, together with recent suggestions of lower limits on Λ[over ˜]. Exploiting more than 10^{9} equilibrium models for each class of EOSs, we produce distribution functions of all the stellar properties and determine, among other quantities, the radius that is statistically most probable for any value of the stellar mass. In this way, we deduce that the radius of a purely hadronic neutron star with a representative mass of 1.4  M_{⊙} is constrained to be 12.00<R_{1.4}/km<13.45 at a 2σ confidence level, with a most likely value of R[over ¯]_{1.4}=12.39  km; similarly, the smallest dimensionless tidal deformability is Λ[over ˜]_{1.4}>375, again at a 2σ level. On the other hand, because EOSs with a phase transition allow for very compact stars on the so-called "twin-star" branch...Continue Reading

References

Apr 27, 2013·Science·John AntoniadisDavid G Whelan
Mar 21, 2017·Reports on Progress in Physics·Luca Baiotti, Luciano Rezzolla
Jun 6, 2017·Living Reviews in Relativity·Brian D Metzger
Nov 4, 2017·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and Virgo Collaboration
Feb 6, 2018·Physical Review Letters·Sukanta BoseKentaro Takami
May 15, 2018·Physical Review Letters·Eemeli AnnalaAleksi Vuorinen

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Citations

Nov 6, 2018·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and the Virgo Collaboration
Mar 2, 2019·Physical Review Letters·Elias R MostLuciano Rezzolla
Sep 25, 2019·Reports on Progress in Physics·Teruaki EnotoShinpei Shibata
May 16, 2020·Physical Review Letters·Lukas R WeihLuciano Rezzolla
Dec 1, 2018·Physical Review Letters·Tyler GordaAleksi Vuorinen
Aug 25, 2018·Physical Review Letters·Yeunhwan Lim, Jeremy W Holt
Apr 17, 2021·Physical Review Letters·Alexandre Le Tiec, Marc Casals

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