| Literature DB >> 17170292 |
Kevin D McKeegan1, Jerome Aléon, John Bradley, Donald Brownlee, Henner Busemann, Anna Butterworth, Marc Chaussidon, Stewart Fallon, Christine Floss, Jamie Gilmour, Matthieu Gounelle, Giles Graham, Yunbin Guan, Philipp R Heck, Peter Hoppe, Ian D Hutcheon, Joachim Huth, Hope Ishii, Motoo Ito, Stein B Jacobsen, Anton Kearsley, Laurie A Leshin, Ming-Chang Liu, Ian Lyon, Kuljeet Marhas, Bernard Marty, Graciela Matrajt, Anders Meibom, Scott Messenger, Smail Mostefaoui, Sujoy Mukhopadhyay, Keiko Nakamura-Messenger, Larry Nittler, Russ Palma, Robert O Pepin, Dimitri A Papanastassiou, François Robert, Dennis Schlutter, Christopher J Snead, Frank J Stadermann, Rhonda Stroud, Peter Tsou, Andrew Westphal, Edward D Young, Karen Ziegler, Laurent Zimmermann, Ernst Zinner.
Abstract
Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild 2 particle fragments; however, extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Nonterrestrial nitrogen and neon isotope ratios suggest that indigenous organic matter and highly volatile materials were successfully collected. Except for a single (17)O-enriched circumstellar stardust grain, silicate and oxide minerals have oxygen isotopic compositions consistent with solar system origin. One refractory grain is (16)O-enriched, like refractory inclusions in meteorites, suggesting that Wild 2 contains material formed at high temperature in the inner solar system and transported to the Kuiper belt before comet accretion.Entities:
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Year: 2006 PMID： 17170292 DOI： 10.1126/science.1135992
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728