中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817

文献类型:期刊论文

作者Utsumi, Yousuke1; Tanaka, Masaomi2; Tominaga, Nozomu3,4; Yoshida, Michitoshi5; Barway, Sudhanshu6; Nagayama, Takahiro7; Zenko, Tetsuya8; Aoki, Kentaro5; Fujiyoshi, Takuya5; Furusawa, Hisanori2
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
出版日期2017-12-01
卷号69期号:6页码:7
ISSN号0004-6264
关键词gravitational waves nuclear reactions, nucleosynthesis, abundances stars: neutron
DOI10.1093/pasj/psx118
通讯作者Utsumi, Yousuke(youtsumi@hiroshima-u.ac.jp)
英文摘要GW170817 is the first detected gravitational wave source from a neutron star merger. We present the Japanese collaboration for gravitational-wave electro-magnetic (J-GEM) follow-up observations of SSS17a, an electromagnetic counterpart of GW170817. SSS17a shows a 2.5mag decline in the z band during the period between 1.7 and 7.7 d after the merger. Such a rapid decline is not comparable with supernovae light curves at any epoch. The color of SSS17a also evolves rapidly and becomes redder during later epochs: the z - H color has changed by approximately 2.5mag during the period between 0.7 and 7.7 d. The rapid evolutions of both the color and the optical brightness are consistent with the expected properties of a kilonova that is powered by the radioactive decay of newly synthesized r-process nuclei. Kilonova models with Lanthanide elements can reproduce the aforementioned observed properties well, which suggests that r-process nucleosynthesis beyond the second peak takes place in SSS17a. However, the absolute magnitude of SSS17a is brighter than the expected brightness of the kilonova models with an ejectamass of 0.01M(circle dot), which suggests a more intensemass ejection (similar to 0.03M(circle dot)) or possibly an additional energy source.
WOS关键词COMPACT OBJECT MERGERS ; K-CORRECTIONS ; CAMERA ; SEXTRACTOR ; IMAGES
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000422942400020
源URL[http://libir.pmo.ac.cn/handle/332002/22172]  
专题中国科学院紫金山天文台
通讯作者Utsumi, Yousuke
作者单位1.Hiroshima Univ, Hiroshima Astrophys Sci Ctr, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 7398526, Japan
2.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
3.Konan Univ, Fac Sci & Engn, Dept Phys, Higashinada Ku, 8-9-1 Okamoto, Kobe, Hyogo 6588501, Japan
4.Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778583, Japan
5.Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA
6.South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa
7.Kagoshima Univ, Grad Sch Sci & Engn, 1-21-35 Korimoto, Kagoshima, Kagoshima 8900065, Japan
8.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto, Kyoto 6068502, Japan
9.Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan
10.Nagoya Univ, Inst Space Earth Environm Res, Furo Cho, Nagoya, Aichi 4648601, Japan
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Utsumi, Yousuke,Tanaka, Masaomi,Tominaga, Nozomu,et al. J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2017,69(6):7.
APA Utsumi, Yousuke.,Tanaka, Masaomi.,Tominaga, Nozomu.,Yoshida, Michitoshi.,Barway, Sudhanshu.,...&Yamaguchi, Masaki S..(2017).J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,69(6),7.
MLA Utsumi, Yousuke,et al."J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69.6(2017):7.

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