气候变化领域集成服务门户(CCPortal): Graphite whiskers in CV3 meteorites

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DOI	10.1126/science.1153578
	Graphite whiskers in CV3 meteorites
	Fries M.; Steele A.
发表日期	2008
ISSN	0036-8075
起始页码	91
结束页码	93
卷号	320 期号:5872
英文摘要	Graphite whiskers (GWs), an allotrope of carbon that has been proposed to occur in space, have been discovered in three CV-type carbonaceous chondrites via Raman imaging and electron microscopy. The GWs are associated with high-temperature calcium-aluminum inclusion (CAI) rims and interiors, with the rim of a dark inclusion, and within an inclusion inside an unusual chondrule that bears mineralogy and texture indicative of high-temperature processing. Current understanding of CAI formation places their condensation, and that of associated GWs, relatively close to the Sun and early in the condensation sequence of protoplanetary disk materials. If this is the case, then it is a possibility that GWs are expelled from any young solar system early in its history, thus populating interstellar space with diffuse GWs. Graphite whiskers have been postulated to play a role in the near-infrared (near-IR) dimming of type Ia supernovae, as well as in the thermalization of both the cosmic IR and microwave background and in galactic center dimming between 3 and 9 micrometers. Our observations, along with the further possibility that GWs could be manufactured during supernovae, suggest that GWs may have substantial effects in observational astronomy.
英文关键词	carbon; aluminum; astronomy; calcium; carbon; chondrite; chondrule; condensation; electron microscopy; extraterrestrial matter; graphite; high temperature; mineralogy; Raman spectroscopy; solar system; article; astronomy; electron microscopy; high temperature; mineralogy; polymerization; priority journal; Raman spectrometry; space; sun; Astronomy; Graphite; Meteoroids; Microscopy, Electron, Scanning; Spectrum Analysis, Raman
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/243743
作者单位	Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road N.W., Washington, DC 20015, United States
推荐引用方式 GB/T 7714	Fries M.,Steele A.. Graphite whiskers in CV3 meteorites[J],2008,320(5872).
APA	Fries M.,&Steele A..(2008).Graphite whiskers in CV3 meteorites.Science,320(5872).
MLA	Fries M.,et al."Graphite whiskers in CV3 meteorites".Science 320.5872(2008).