Interstellar silicon carbide - How much older than the solar system?

Details Interstellar silicon carbide - How much older than the solar system? Interstellar silicon carbide - How much older than the solar system?

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335l..31t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. L31-L34.

Astronomy and Astrophysics

Astrophysics

17

Chondrites, Cosmochemistry, Interstellar Matter, Silicon Carbides, Cosmology, Murchison Meteorite, Neon, Nitrogen, Solar System, Xenon

Scientific paper

The SiC grains in C2 chondrites have large isotopic anomalies in Si, C, N, Ne, and Xe, and thus are virtually undegraded interstellar matter that survived formation of the solar system. They also contain excess Ne-21, of which only a minor part can have formed during the recent, 1 Myr cosmic-ray exposure of the meteorite. If the excess Ne-21 is cosmogenic, then the presolar exposure age of the SiC is 41 + 20 or - 14 Myr. This age is surprisingly short compared to the predicted lifetime of refractory interstellar grains, 500-1000 Myr. Possible explanations are: (1) the predicted grain lifetime is wrong, (2) the age of SiC has been falsified by neon losses, or (3) the solar system formed in part from atypically young material.

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