The most thoroughly studied of the isotopi-cally anomalous presolar grains are silicon-carbide crystals (1). Both X-type SiC and low-density graphite grains condensed within the interiors of supernovae during their expansion and cooling (2). This paper concerns itself with iron in those su-pernova condensates (SUNOCONs), for which Fe anomalies was an early prediction (3). A major problem in SUNOCON interpretation has been that although the grains clearly rep-resent supernova interiors, it is not clear from which parcels of gas the grains condensed. The presence of 60-yr Ti in SUNOCONs as a major isotope of Ti demonstrates the prompt condensation of titanium, long before supernova ejecta have mixed with circumstellar matter, and even long before the reverse shock reheats the supernovae ejecta.
Iron Isotopic Diagnostics of Presolar Supernova GrainsPublications
PublisherLunar and Planetary Science Conference XXXIII
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