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Journal articles

Helium and Neon Abundances and Compositions in Cometary Matter

Abstract : 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.
Keywords : PLANET SCI
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Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, March 25, 2022 - 8:11:04 AM
Last modification on : Saturday, March 26, 2022 - 4:12:14 AM

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Bernard Marty, Russell L. Palma, Robert O. Pepin, Laurent Zimmermann, Dennis J. Schlutter, et al.. Helium and Neon Abundances and Compositions in Cometary Matter. Science, 2008, 319, pp.75. ⟨10.1126/science.1148001⟩. ⟨insu-03619246⟩



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