Are Presolar Silicon Carbide Grains from Novae Actually from Supernovae?

Details Are Presolar Silicon Carbide Grains from Novae Actually from Supernovae? Are Presolar Silicon Carbide Grains from Novae Actually from Supernovae?

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...631l..89n&link_type=abstract

The Astrophysical Journal, Volume 631, Issue 1, pp. L89-L92.

Astronomy and Astrophysics

Astronomy

40

Ism: Dust, Extinction, Meteors, Meteoroids, Stars: Novae, Cataclysmic Variables, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General

Scientific paper

We report Si, C, N, Mg-Al, Ca, and Ti isotopic data for three micron-sized presolar SiC grains from the Murchison meteorite. These grains have very low 12C/13C and 14N/15N ratios, similar to grains for which an origin in classical ONe novae has been previously ascribed. Isotopic signatures in one grain (28Si, 49Ti, and 44Ca excesses and a very high inferred 26Al/27Al ratio) indicate that it in fact formed in a supernova, not a nova. Similarly, a large 47Ti excess in another grain argues against a nova origin. The new data raise the question whether all grains previously attributed to novae might have in fact originated in Type II supernovae. The results also point to coupled synthesis of 13C and 15N in Type II supernovae.

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