Publication Date:
2006-12-16
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McKeegan, Kevin D -- Aleon, Jerome -- Bradley, John -- Brownlee, Donald -- Busemann, Henner -- Butterworth, Anna -- Chaussidon, Marc -- Fallon, Stewart -- Floss, Christine -- Gilmour, Jamie -- Gounelle, Matthieu -- Graham, Giles -- Guan, Yunbin -- Heck, Philipp R -- Hoppe, Peter -- Hutcheon, Ian D -- Huth, Joachim -- Ishii, Hope -- Ito, Motoo -- Jacobsen, Stein B -- Kearsley, Anton -- Leshin, Laurie A -- Liu, Ming-Chang -- Lyon, Ian -- Marhas, Kuljeet -- Marty, Bernard -- Matrajt, Graciela -- Meibom, Anders -- Messenger, Scott -- Mostefaoui, Smail -- Mukhopadhyay, Sujoy -- Nakamura-Messenger, Keiko -- Nittler, Larry -- Palma, Russ -- Pepin, Robert O -- Papanastassiou, Dimitri A -- Robert, Francois -- Schlutter, Dennis -- Snead, Christopher J -- Stadermann, Frank J -- Stroud, Rhonda -- Tsou, Peter -- Westphal, Andrew -- Young, Edward D -- Ziegler, Karen -- Zimmermann, Laurent -- Zinner, Ernst -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1724-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Space Sciences, University of California Los Angeles, Los Angeles, CA 90095-1567, USA. mckeegan@ess.ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170292" target="_blank"〉PubMed〈/a〉
Keywords:
Carbon Isotopes/*analysis
;
Deuterium/*analysis
;
Hydrogen/analysis
;
Isotopes/*analysis
;
*Meteoroids
;
Neon/analysis
;
Nitrogen Isotopes/*analysis
;
Noble Gases/analysis
;
Oxygen Isotopes/*analysis
;
Spacecraft
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
