A possible macronova in the late afterglow of the long-short burst GRB 060614

被引：241

作者：

Yang, Bin ^{[1
,2
]}

Jin, Zhi-Ping ^{[1
]}

Li, Xiang ^{[1
,2
]}

Covino, Stefano ^{[3
]}

Zheng, Xian-Zhong ^{[1
]}

Hotokezaka, Kenta ^{[4
]}

Fan, Yi-Zhong ^{[1
,5
]}

Piran, Tsvi ^{[4
]}

Wei, Da-Ming ^{[1
]}

机构：

[1] Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] INAF, Brera Astron Observ, I-23807 Merate, Italy

[4] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[5] Nanjing Univ, Collaborat Innovat Ctr Modern Astron & Space Expl, Nanjing 210046, Jiangsu, Peoples R China

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

关键词：

GAMMA-RAY BURST; NEUTRON-STAR; DYNAMICAL EJECTA; LIGHT CURVES; NUCLEOSYNTHESIS; GRB-060614; SUPERNOVA; MERGERS;

D O I：

10.1038/ncomms8323

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Long-duration (> 2 s) gamma-ray bursts that are believed to originate from the death of massive stars are expected to be accompanied by supernovae. GRB 060614, that lasted 102 s, lacks a supernova-like emission down to very stringent limits and its physical origin is still debated. Here we report the discovery of near-infrared bump that is significantly above the regular decaying afterglow. This red bump is inconsistent with even the weakest known supernova. However, it can arise from a Li-Paczynski macronova-the radioactive decay of debris following a compact binary merger. If this interpretation is correct, GRB 060614 arose from a compact binary merger rather than from the death of a massive star and it was a site of a significant production of heavy r-process elements. The significant ejected mass favours a black hole-neutron star merger but a double neutron star merger cannot be ruled out.

引用

页数：5