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Helium and Neon Abundances and Compositions in Cometary Matter

Materials trapped and preserved in comets date from the earliest history of the solar system. Particles captured by the Stardust spacecraft from comet 81P/Wild 2 are indisputable cometary matter available for laboratory study. Here we report measurements of noble gases in Stardust material. Neon iso...

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Published in:Science (American Association for the Advancement of Science) 2008, Vol.319
Main Authors: Marty, Bernard, Palma, Russell L., Pepin, Robert O., Zimmermann, Laurent, Schlutter, Dennis J., Burnard, Peter G., Westphal, Andrew J., Snead, Christopher J., Bajt, Saša, Becker, Richard H., Simones, Jacob E.
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container_title Science (American Association for the Advancement of Science)
container_volume 319
creator Marty, Bernard
Palma, Russell L.
Pepin, Robert O.
Zimmermann, Laurent
Schlutter, Dennis J.
Burnard, Peter G.
Westphal, Andrew J.
Snead, Christopher J.
Bajt, Saša
Becker, Richard H.
Simones, Jacob E.
description Materials trapped and preserved in comets date from the earliest history of the solar system. Particles captured by the Stardust spacecraft from comet 81P/Wild 2 are indisputable cometary matter available for laboratory study. Here we report measurements of noble gases in Stardust material. Neon isotope ratios are within the range observed in “phase Q,” a ubiquitous, primitive organic carrier of noble gases in meteorites. Helium displays 3He/4He ratios twice those in phase Q and in Jupiter’s atmosphere. Abundances per gram are surprisingly large, suggesting implantation by ion irradiation. The gases are probably carried in high-temperature igneous grains similar to particles found in other Stardust studies. Collectively, the evidence points to gas acquisition in a hot, high ion-flux nebular environment close to the young Sun.
doi_str_mv 10.1126/science.1148001
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title Helium and Neon Abundances and Compositions in Cometary Matter
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