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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.1, 2; Huang, Y. F.3, 4; Zong, H. S.1, 2, 5
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-06-01
卷号: 823, 期号:2
关键词: gamma-ray burst: individual (GRB 130831A) ; gravitational waves ; ISM: jets and outflows ; stars: neutron
DOI: 10.3847/0004-637X/823/2/156
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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[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
WOS记录号: WOS:000377410000087
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16232
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China
2.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
4.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
5.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
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