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题名: GRB 080503 LATE AFTERGLOW RE-BRIGHTENING: SIGNATURE OF A MAGNETAR-POWERED MERGER-NOVA
作者: Gao, He1, 2, 3, 4; Ding, Xuan1; Wu XueFeng(吴雪峰)1, 5; Dai, Zi-Gao6, 7; Zhang, Bing8
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-07-10
卷号: 807, 期号:2, 页码:163
关键词: gamma-ray burst: general ; radiation mechanisms: non-thermal ; stars: neutron
学科分类: 天文和天体物理
DOI: 10.1088/0004-637X/807/2/163
文章类型: Article
英文摘要: GRB 080503 is a short gamma-ray burst (GRB) detected by Swift and has been classified as a GRB originating from a compact star merger. The soft extended emission and the simultaneous late re-brightening in both the X-ray and optical afterglow light curves raise interesting questions regarding its physical origin. We show that the broadband data of GRB 080503 can be well explained within the framework of the double neutron star merger model, provided that the merger remnant is a rapidly rotating massive neutron star with an extremely high magnetic field (i.e., a millisecond magnetar). We show that the late optical re-brightening is consistent with the emission from a magnetar-powered "merger-nova." This adds one more case to the growing sample of merger-novae associated with short GRBs. The soft extended emission and the late X-ray excess emission are well connected through a magnetar dipole spin-down luminosity evolution function, suggesting that direct magnetic dissipation is the mechanism to produce these X-rays. The X-ray emission initially leaks from a hole in the merger ejecta pierced by the short GRB jet. The hole subsequently closes after the magnetar spins down and the magnetic pressure drops below ram pressure. The X-ray photons are then trapped behind the merger-nova ejecta until the ejecta becomes optically thin at a later time. This explains the essentially simultaneous re-brightening in both the optical and X-ray light curves. Within this model, future gravitational-wave sources could be associated with a bright X-ray counterpart along with the merger-nova, even if the short GRB jet beams away from Earth.
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 ; NEUTRON-STAR MERGERS ; COMPACT OBJECT MERGERS ; GRAVITATIONAL-WAVE BURSTS ; REVERSE SHOCK EMISSION ; EARLY X-RAY ; MILLISECOND MAGNETAR ; LIGHT CURVES ; EXTENDED EMISSION ; CENTRAL ENGINE
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000358967000049
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14878
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
3.Penn State Univ, Dept Phys, University Pk, PA 16802 USA
4.Penn State Univ, Ctr Particle & Gravitat Astrophys, Inst Gravitat & Cosmos, University Pk, PA 16802 USA
5.Nanjing Univ, Purple Mt Observ, Joint Ctr Nucl Particle Phys & Cosmol, Nanjing 210008, Jiangsu, Peoples R China
6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 2100093, Jiangsu, Peoples R China
7.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing, Jiangsu, Peoples R China
8.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
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