Heavy Double Neutron Stars: Birth, Midlife, and Death

被引：31

作者：

Galaudage, Shanika ^{[1
,2
]}

Adamcewicz, Christian ^{[1
,2
]}

Zhu, Xing-Jiang ^{[1
,2
]}

Stevenson, Simon ^{[3
,4
]}

Thrane, Eric ^{[1
,2
]}

机构：

[1] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia

[2] OzGrav ARC Ctr Excellence Gravitat Wave Discovery, Clayton, Vic 3800, Australia

[3] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[4] OzGrav ARC Ctr Excellence Gravitat Wave Discovery, Hawthorn, Vic 3122, Australia

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2021年 / 909卷 / 02期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

Neutron stars; Gravitational waves; Binary pulsars; MAXIMUM MASS; PULSAR; EVOLUTION; BINARIES; KICKS; SPIN;

D O I：

10.3847/2041-8213/abe7f6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Radio pulsar observations probe the lives of Galactic double neutron star (DNS) systems while gravitational waves enable us to study extragalactic DNS in their final moments. By combining measurements from radio and gravitational-wave astronomy, we seek to gain a more complete understanding of DNS from formation to merger. We analyze the recent gravitational-wave binary neutron star mergers GW170817 and GW190425 in the context of other DNS known from radio astronomy. By employing a model for the birth and evolution of DNS, we measure the mass distribution of DNS at birth, at midlife (in the radio), and at death (in gravitational waves). We consider the hypothesis that the high-mass gravitational-wave event GW190425 is part of a subpopulation formed through unstable case BB mass transfer, which quickly merge in similar to 10-100 Myr. We find only mild evidence to support this hypothesis and that GW190425 is not a clear outlier from the radio population as previously claimed. If there are fast-merging binaries, we estimate that they constitute 8%-79% of DNS at birth (90% credibility). We estimate the typical delay time between the birth and death of fast-merging binaries to be 5-401 Myr (90% credibility). We discuss the implications for radio and gravitational-wave astronomy.

引用

页数：12

共 87 条

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