GW170817-the first observed neutron star merger and its kilonova: Implications for the astrophysical site of the r-process

被引：78

作者：

Siegel, Daniel M. ^{[1
,2
,3
,4
]}

机构：

[1] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[2] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada

[3] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

[4] Columbia Univ, Columbia Astrophys Lab, 538 W 120th St, New York, NY 10027 USA

来源：

EUROPEAN PHYSICAL JOURNAL A | 2019年 / 55卷 / 11期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

GAMMA-RAY BURSTS; CORE-COLLAPSE SUPERNOVAE; EXTREMELY METAL-POOR; ELECTROMAGNETIC COUNTERPART; PROCESS NUCLEOSYNTHESIS; GALACTIC EVOLUTION; PHYSICAL MODELS; HOST GALAXIES; MASS EJECTION; BLACK-HOLES;

D O I：

10.1140/epja/i2019-12888-9

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The first neutron star (NS) merger observed by advanced LIGO and Virgo, GW170817, and its fireworks of electromagnetic counterparts across the entire electromagnetic spectrum marked the beginning of multi-messenger astronomy and astrophysics with gravitational waves. The ultraviolet, optical, and near-infrared emission was consistent with being powered by the radioactive decay of nuclei synthesized in the merger ejecta by the rapid neutron capture process (r-process). Starting from an outline of the inferred properties of this "kilonova" emission, I discuss possible astrophysical sites for r-process nucleosynthesis in NS mergers, arguing that the heaviest r-process elements synthesized in this event most likely originated in outflows from a post-merger accretion disk. I compare the inferred properties of r-process element production in GW170817 to current observational constraints on galactic heavy r-process nucleosynthesis and discuss challenges merger-only models face in explaining the r-process content of our galaxy. Based on the observational properties of GW170817 and recent theoretical progress on r-process nucleosynthesis in collapsars, I then show how GW170817 points to collapsars as the dominant source of r-process enrichment in the Milky Way. These rare core-collapse events arguably better satisfy existing constraints and overcome problems related to r-process enrichment in various environments that NS mergers face. Finally, I comment on the universality of the r-process and on how variations in light r-process elements can be obtained both in NS mergers and collapsars.

引用

页数：20

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