Extinct 44Ti in Presolar Graphite and SiC: Proof of a Supernova Origin

Details Extinct 44Ti in Presolar Graphite and SiC: Proof of a Supernova Origin Extinct 44Ti in Presolar Graphite and SiC: Proof of a Supernova Origin

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462l..31n&link_type=abstract

Astrophysical Journal Letters v.462, p.L31

Astronomy and Astrophysics

Astronomy

106

Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General, Ism: Dust, Extinction

Scientific paper

Large excesses in 44Ca, from the radioactive decay of short-lived 44Ti, have been observed in four low-density graphite grains and five SiC grains of type X extracted from the Murchison meteorite. Titanium-46, 49Ti, and 50Ti excesses were also observed in several of these grains. Because 44Ti is only produced in supernovae, these grains must have a supernova origin. Moreover, Si-, C-, N-, Al-, O-, and Ti-isotopic compositions of the grains require a Type II supernova source, and indicate extensive and heterogeneous mixing of different supernova regions, including the nickel core.

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