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MODELING THE MULTI-BAND AFTERGLOW OF GRB 130831A: EVIDENCE FOR A SPINNING-DOWN MAGNETAR DOMINATED BY GRAVITATIONAL WAVE LOSSES?
Zhang, Q.1,2; Huang, Y. F.3,4; Zong, H. S.1,2,5
2016-06-01
Source PublicationASTROPHYSICAL JOURNAL
Volume823Issue:2
AbstractThe 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.
KeywordGamma-ray Burst: Individual (Grb 130831a) Gravitational Waves Ism: Jets And Outflows Stars: Neutron
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3847/0004-637X/823/2/156
WOS KeywordGAMMA-RAY BURSTS ; ROTATING RELATIVISTIC STARS ; NEWLY BORN MAGNETARS ; SWIFT XRT DATA ; LIGHT CURVES ; ENERGY INJECTION ; MILLISECOND MAGNETAR ; CENTRAL ENGINE ; NEUTRON-STARS ; EXTENDED EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000377410000087
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16232
Collection南极天文中心
Affiliation1.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
Recommended Citation
GB/T 7714
Zhang, Q.,Huang, Y. F.,Zong, H. S.. 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).
APA Zhang, Q.,Huang, Y. F.,&Zong, H. S..(2016).MODELING THE MULTI-BAND AFTERGLOW OF GRB 130831A: EVIDENCE FOR A SPINNING-DOWN MAGNETAR DOMINATED BY GRAVITATIONAL WAVE LOSSES?.ASTROPHYSICAL JOURNAL,823(2).
MLA Zhang, Q.,et al."MODELING THE MULTI-BAND AFTERGLOW OF GRB 130831A: EVIDENCE FOR A SPINNING-DOWN MAGNETAR DOMINATED BY GRAVITATIONAL WAVE LOSSES?".ASTROPHYSICAL JOURNAL 823.2(2016).
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