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Letters to Nature
Nature 270, 700 - 701 (22 December 1977); doi:10.1038/270700a0

Are supernovae sources of presolar grains?

SYDNEY W. FALK*, JAMES M. LATTIMER† & S. H. MARGOLIS‡

*Enrico Fermi Institute, University of Chicago, and I.B.M.—T.J. Watson Research Center, Yorktown Heights, New York
†Department of Astronomy, University of Illinois, Urbana, Illinois 61801
‡Enrico Fermi Institute, University of Chicago, 933 E 56th Street, Chicago, Illinois 60637

ISOTOPIC measurements1 in chondritic meteorites have revealed that live 26Al was present in the early solar system. 26Al and other reported isotopic peculiarities2–4 in the meteorite Allende could be attributable to explosive nucleosynthesis, sparking suggestions1–8 that a nearby supernova may have contaminated the early solar nebula. One explanation for isotopic anomalies in early nebular condensates is the injection of supernova grains. An advantage of this mechanism is that it could avoid excessive dilution of the anomalies by the bulk of the nebula. We examine here the early expansion of supernovae to determine the likelihood of grain nucleation and growth.

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