Modeling GW170817 based on numerical relativity and its implications

被引：388

作者：

Shibata, Masaru ^{[1
]}

Fujibayashi, Sho ^{[1
]}

Hotokezaka, Kenta ^{[1
,2
]}

Kiuchi, Kenta ^{[1
]}

Kyutoku, Koutarou ^{[1
,3
,4
,5
]}

Sekiguchi, Yuichiro ^{[1
,6
]}

Tanaka, Masaomi ^{[7
]}

机构：

[1] Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys, Kyoto 6068502, Japan

[2] Inst Adv Study, Sch Nat Sci, Olden Lane, Princeton, NJ 08540 USA

[3] KEK, Inst Particle & Nucl Studies, Theory Ctr, Tsukuba, Ibaraki 3050801, Japan

[4] Grad Univ Adv Studies Sokendai, Dept Particle & Nucl Phys, Tsukuba, Ibaraki 3050801, Japan

[5] RIKEN, Interdisciplinary Theoret Sci iTHES Res Grp, Wako, Saitama 3510198, Japan

[6] Toho Univ, Dept Phys, Funabashi, Chiba 2748510, Japan

[7] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

来源：

PHYSICAL REVIEW D | 2017年 / 96卷 / 12期

关键词：

R-PROCESS NUCLEOSYNTHESIS; NEUTRINO-DRIVEN WINDS; EQUATION-OF-STATE; BLACK-HOLE; RADIOACTIVE DECAY; ACCRETION TORI; BINARY MERGERS; KILONOVA; EJECTA; EMISSION;

D O I：

10.1103/PhysRevD.96.123012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Gravitational-wave observation together with a large number of electromagnetic observations shows that the source of the latest gravitational-wave event, GW170817, detected primarily by advanced LIGO, is the merger of a binary neutron star. We attempt to interpret this observational event based on our results of numerical-relativity simulations performed so far, paying particular attention to the optical and infrared observations. We finally reach a conclusion that this event is described consistently by the presence of a long-lived hypermassive or supramassive neutron star as the merger remnant because (i) significant contamination by lanthanide elements along our line of sight to this source can be avoided by the strong neutrino irradiation from it and (ii) it could play a crucial role in producing an ejecta component of appreciable mass with fast motion in the postmerger phase. We also point out that (I) the neutron-star equation of state has to be sufficiently stiff (i.e., the maximum mass of cold spherical neutron stars, M-max, has to be appreciably higher than 2 M-circle dot) in order for a long-lived massive neutron star to be formed as the merger remnant for the binary systems of GW170817, for which the initial total mass is greater than or similar to 2.73 M-circle dot, and (II) the absence of optical counterparts associated with relativistic ejecta suggests a not-extremely-high value of M-max approximately as 2.15-2.25 M-circle dot.

引用

页数：22

共 119 条

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