A General-relativistic Determination of the Threshold Mass to Prompt Collapse in Binary Neutron Star Mergers

被引：120

作者：

Koeppel, Sven ^{[1
]}

Bovard, Luke ^{[1
]}

Rezzolla, Luciano ^{[1
]}

机构：

[1] Goethe Univ, Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 872卷 / 01期

基金：

欧盟地平线“2020”;

关键词：

binaries: general; gravitational waves; methods: numerical; stars: general; stars: neutron; MAXIMUM MASS; EJECTION;

D O I：

10.3847/2041-8213/ab0210

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the lifetimes of the remnant produced by the merger of two neutron stars and revisit the determination of the threshold mass to prompt collapse, M-th. Using a fully general-relativistic numerical approach and a novel method for a rigorous determination of M-th, we show that a nonlinear universal relation exists between the threshold mass and the maximum compactness. For the temperature-dependent equations of state considered here, our results improve a similar linear relation found recently with methods that are less accurate but yield quantitatively similar results. Furthermore, exploiting the information from GW170817, we use the universal relation to set lower limits on the stellar radii for any mass.

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