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题名: OPTICAL TRANSIENTS POWERED BY MAGNETARS: DYNAMICS, LIGHT CURVES, AND TRANSITION TO THE NEBULAR PHASE
作者: Wang, Ling-Jun1, 2, 3; Wang, S. Q.2, 3; Dai, Z. G.2, 3; Xu, Dong1; Han, Yan-Hui1; Wu, X. F.4, 5; Wei, Jian-Yan1
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-04-10
卷号: 821, 期号:1
关键词: radiation mechanisms: thermal ; stars: neutron ; supernovae: general
DOI: 10.3847/0004-637X/821/1/22
文章类型: Article
英文摘要: Millisecond magnetars can be formed via several channels: core collapse of massive stars, accretion-induced collapse of white dwarfs (WDs), double WD mergers, double neutron star (NS) mergers, and WD- NS mergers. Because the mass of ejecta from these channels could be quite different, their light curves are also expected to be diverse. We evaluate the dynamic evolution of optical transients powered by millisecond magnetars. We find that the magnetar with a short spin-down timescale converts its rotational energy mostly into the kinetic energy of the transient, while the energy of a magnetar with a long spin-down timescale goes into radiation of the transient. This leads us to speculate that hypernovae could be powered by magnetars with short spin-down timescales. At late times the optical transients will gradually evolve into a nebular phase because of the photospheric recession. We treat the photosphere and nebula separately because their radiation mechanisms are different. In some cases the ejecta could be light enough that the magnetar can accelerate it to a relativistic speed. It is well known that the peak luminosity of a supernova (SN) occurs when the luminosity is equal to the instantaneous energy input rate, as shown by Arnett. We show that photospheric recession and relativistic motion can modify this law. The photospheric recession always leads to a delay of the peak time t(pk) relative to the time t(x) at which the SN luminosity equals the instantaneous energy input rate. Relativistic motion, however, may change this result significantly.
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 ; ACCRETION-INDUCED COLLAPSE ; COMPACT OBJECT MERGERS ; I SUPER-NOVAE ; NEUTRON-STAR ; SUPERLUMINOUS SUPERNOVAE ; WHITE-DWARFS ; MILLISECOND PULSARS ; R-PROCESS ; ANALYTIC SOLUTIONS
收录类别: SCI
项目资助者: National Basic Research Program ("973" Program) of China(2014CB845800) ; National Natural Science Foundation of China(U1331202 ; One-Hundred-Talent Program from the National Astronomical Observatories ; One-Hundred-Talent Program ; Youth Innovation Promotion Association(2011231) ; Strategic Priority Research Program "The Emergence of Cosmological Structure" of Chinese Academy of Sciences of Chinese Academy of Sciences(XDB09000000) ; 11573014 ; 11322328)
语种: 英语
WOS记录号: WOS:000373809000022
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16187
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, Key Lab Space Astron & Technol, Natl Astron Observ, Beijing 100012, Peoples R China
2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210008, Jiangsu, Peoples R China
3.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210008, Jiangsu, Peoples R China
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