气候变化领域集成服务门户(CCPortal): Early 56Ni decay gamma rays from SN2014J suggest an unusual explosion

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DOI	10.1126/science.1254738
	Early 56Ni decay gamma rays from SN2014J suggest an unusual explosion
	Diehl R.; Siegert T.; Hillebrandt W.; Grebenev S.A.; Greiner J.; Krause M.; Kromer M.; Maeda K.; Röpke F.; Taubenberger S.
发表日期	2014
ISSN	0036-8075
起始页码	1162
结束页码	1165
期号	6201
英文摘要	Type Ia supernovae result from binary systems that include a carbon-oxygen white dwarf, and these thermonuclear explosions typically produce 0.5 solar mass of radioactive 56Ni. The 56Ni is commonly believed to be buried deeply in the expanding supernova cloud. In SN2014J, we detected the lines at 158 and 812 kiloelectron volts from 56Ni decay (time ~8.8 days) earlier than the expected several-week time scale, only ~20 days after the explosion and with flux levels corresponding to roughly 10% of the total expected amount of 56Ni. Some mechanism must break the spherical symmetry of the supernova and at the same time create a major amount of 56Ni at the outskirts. A plausible explanation is that a belt of helium from the companion star is accreted by the white dwarf, where this material explodes and then triggers the supernova event. Copyright © 2014 by the American Association for the Advancement of Science; all rights reserved.
英文关键词	carbon; helium; nickel; proton; radioactive material; cloud; gamma ray radiation; helium; nuclear explosion; radioactivity; Article; brightness; explosion; gamma radiation; neutron; nuclear energy; photon; priority journal; radioisotope decay
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243539
作者单位	Max-Planck-Institut Für Extraterrestrische Physik, Giessenbachstrasse 1, Garching, D-85741, Germany; Max-Planck-Institut Für Astrophysik, Karl-Schwarzschild-Strasse 1, Garching, 85741, Germany; Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, Moscow, 117997, Russian Federation; Oskar Klein Centre and Department of Astronomy, Stockholm University, AlbaNova, Stockholm, SE-106 91, Sweden; Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan; Kavli Institute (WPI), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8583, Japan; Institut Für Theoretische Physik und Astrophysik, Universität Würzburg, Emil-Fischer-Strasse 31, Würzburg, 97074, Germany
推荐引用方式 GB/T 7714	Diehl R.,Siegert T.,Hillebrandt W.,et al. Early 56Ni decay gamma rays from SN2014J suggest an unusual explosion[J],2014(6201).
APA	Diehl R..,Siegert T..,Hillebrandt W..,Grebenev S.A..,Greiner J..,...&Taubenberger S..(2014).Early 56Ni decay gamma rays from SN2014J suggest an unusual explosion.Science(6201).
MLA	Diehl R.,et al."Early 56Ni decay gamma rays from SN2014J suggest an unusual explosion".Science .6201(2014).