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题名: MODELING THE MULTI-BAND AFTERGLOW OF GRB 130831A: EVIDENCE FOR A SPINNING-DOWN MAGNETAR DOMINATED BY GRAVITATIONAL WAVE LOSSES?
作者: Zhang, Q ;  Huang, YF ;  Zong, HS
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016
卷号: 823, 期号:2, 页码:156
关键词: gamma-ray burst: individual (GRB 130831A) ;  gravitational waves ;  ISM: jets and outflows ;  stars: neutron
学科分类: Astronomy & Astrophysics
DOI: http://dx.doi.org/10.3847/0004-637X/823/2/156
通讯作者: Zhang, Q (reprint author), Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China. ;  Zhang, Q (reprint author), Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China.
文章类型: Article
英文摘要: The X-ray afterglow of GRB 130831A shows an "internal plateau" with a decay slope of similar to 0.8, followed by a steep drop at around 10(5) s with a slope of similar to 6. After the drop, the X-ray afterglow continues with a much shallower decay. The optical afterglow exhibits two segments of plateaus separated by a luminous optical flare, followed by a normal decay with a slope basically consistent with that of the late-time X-ray afterglow. The decay of the internal X-ray plateau is much steeper than what we expect in the simplest magnetar model. We propose a scenario in which the magnetar undergoes gravitational-wave-driven r-mode instability, and the spin-down is dominated by gravitational wave losses up to the end of the steep plateau, so that such a relatively steep plateau can be interpreted as the internal emission of the magnetar wind and the sharp drop can be produced when the magnetar collapses into a black hole. This scenario also predicts an initial X-ray plateau lasting for hundreds of seconds with an approximately constant flux which is compatible with observation. Assuming that the magnetar wind has a negligible contribution in the optical band, we interpret the optical afterglow as the forward shock emission by invoking the energy injection from a continuously refreshed shock following the prompt emission phase. It is shown that our model can basically describe the temporal evolution of the multi-band afterglow of GRB 130831A.
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: GAMMA-RAY BURSTS ;  ROTATING RELATIVISTIC STARS ;  NEWLY BORN MAGNETARS ;  SWIFT XRT DATA ;  LIGHT CURVES ;  ENERGY INJECTION ;  MILLISECOND MAGNETAR ;  CENTRAL ENGINE ;  NEUTRON-STARS ;  EXTENDED EMISSION
收录类别: SCI
项目资助者: National Basic Research Program of China [2014CB845800] ;  National Natural Science Foundation of China [11473012, 11475085, 11275097]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21633
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Zhang, Q,Huang, YF,Zong, HS. MODELING THE MULTI-BAND AFTERGLOW OF GRB 130831A: EVIDENCE FOR A SPINNING-DOWN MAGNETAR DOMINATED BY GRAVITATIONAL WAVE LOSSES?[J]. ASTROPHYSICAL JOURNAL,2016,823(2):156.
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