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A Late Episode of Irradiation in the Early Solar System: Evidence from Extinct ^(36)Cl and ^(26)Al in Meteorites

Hsu, Weibiao and Guan, Yunbin and Leshin, L. A. and Ushikubo, Takayuki and Wasserburg, G. J. (2006) A Late Episode of Irradiation in the Early Solar System: Evidence from Extinct ^(36)Cl and ^(26)Al in Meteorites. Astrophysical Journal, 640 (1). pp. 525-529. ISSN 0004-637X. doi:10.1086/500043.

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Late-formed halogen-rich phases in a refractory inclusion and a chondrule from the Allende meteorite exhibit large ^(36)S excesses that linearly correlate with the chlorine concentration, providing strong evidence in support of the existence of the short-lived nuclide ^(36)Cl (mean life of 0.43 Myr) in the early solar system. The inferred ^(36)Cl/^(35)Cl ratios at the time when these phases formed are very high (~4 × 10^(-6)) and essentially the same for the inclusion and the chondrule and confirm the earlier report of ^(36)S excess in another meteorite. In addition, the ^(36)Cl is decoupled from ^(26)Al. The observed and any possible higher levels of ^(36)Cl cannot be the result of a supernova or AGB stellar source but require a late episode of energetic particle bombardment by the early Sun, in support of the arguments based on the previous discovery of ^(10)Be. It is now clear that a blend of several sources is required to explain the short-lived nuclei when the solar system formed.

Item Type:Article
Related URLs:
URLURL TypeDescription
Guan, Yunbin0000-0002-7636-3735
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 2006 American Astronomical Society. Received 2005 October 7; accepted 2005 November 22. This work was supported by Chinese National Natural Science Foundation for Distinguished Young Scholars (grant 40325009), by the "One-Hundred-Talent Program" of the Chinese Academy of Sciences, by the Minor Planet Foundation of China, by DOE grant DE-FG-03-88ER13851 (G. J. W.), and by a NASA grant NNG 05GH3736 (L. A. L./Y. G.). The terrestrial sodalite sample used in this study was prepared by Xin Hua. The authors wish to thank M. Busso for a detailed constructive and critical review. This is Caltech Division of Geological and Planetary Science Contribution 9133(1121).
Group:UNSPECIFIED, UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
National Natural Science Foundation of China40325009
Chinese Academy of Sciences One Hundred Talents ProgramUNSPECIFIED
Minor Planet Foundation of ChinaUNSPECIFIED
Department of Energy (DOE)DE-FG-03-88ER13851
Subject Keywords:solar system: formation
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences9133
Lunatic Asylum Lab1121
Issue or Number:1
Record Number:CaltechAUTHORS:20131211-141250305
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Official Citation:A Late Episode of Irradiation in the Early Solar System: Evidence from Extinct 36Cl and 26Al in Meteorites Weibiao Hsu et al. 2006 ApJ 640 525
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42963
Deposited By: Ruth Sustaita
Deposited On:11 Dec 2013 22:36
Last Modified:10 Nov 2021 16:31

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