Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...569l.139d&link_type=abstract
The Astrophysical Journal, Volume 569, Issue 2, pp. L139-L142.
Astronomy and Astrophysics
Astronomy
28
Minor Planets, Asteroids, Nuclear Reactions, Nucleosynthesis, Abundances, Solar System: Formation, Sun: Abundances
Scientific paper
The collapse of the presolar cloud gave rise to a global homogenization of material available to form the Sun and planets. In the resulting, presumably homogeneous solar system, the nuclides are present in proportions referred to as their cosmic abundances. Here we report molybdenum isotopic compositions of bulk samples and leachate fractions of the primitive meteorites Orgueil and Allende. Two complementary nucleosynthetic components are revealed in Orgueil. One (Mo-m) is enriched in s-process nuclides and may be hosted in presolar grains while the other (Mo-w) is probably distributed in various phases and is depleted in s-process nuclides. The most likely carrier of Mo-m is silicon carbide, although we cannot exclude graphite or an unidentified presolar phase. Excesses in Mo-w are also detected in the bulk sample and all leachate fractions of Allende. These results illustrate that the apparent cosmic abundance pattern of the nuclides, in fact, reflects a mixture of various nucleosynthetic components that survived planetary-scale homogenization in the protosolar nebula.
Dauphas Nicolas
Marty Bernard
Reisberg Laurie
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