期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 745, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/745/2/L19
关键词
comets: individual (Wild 2); Kuiper belt: general; planets and satellites: formation; planets and satellites: individual (Jupiter)
资金
- NASA [NNX07AM62G, NNX07AM67G]
- Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC02-05CH11231]
We report the petrology, O isotopic composition, and Al-Mg isotope systematics of a chondrule fragment from the Jupiter-family comet Wild 2, returned to Earth by NASA's Stardust mission. This object shows characteristics of a type II chondrule that formed from an evolved oxygen isotopic reservoir. No evidence for extinct Al-26 was found, with (Al-26/Al-27)(0) < 3.0 x 10(-6). Assuming homogenous distribution of Al-26 in the solar nebula, this particle crystallized at least 3 Myr after the earliest solar system objects-relatively late compared to most chondrules in meteorites. We interpret the presence of this object in a Kuiper Belt body as evidence of late, large-scale transport of small objects between the inner and outer solar nebula. Our observations constrain the formation of Jupiter (a barrier to outward transport if it formed further from the Sun than this cometary chondrule) to be more than 3 Myr after calcium-aluminum-rich inclusions.
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