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Injection of material from a core-collapse supernova into the solar system'salready-formed disk is one proposed mechanism for producing the short-livedradionuclides, such as 26Al and 41Ca, inferred from isotopic studies ofmeteorites to have existed in the solar nebula. This hypothesis has recentlybeen challenged on the basis that the injection of enough supernova material tomatch the meteoritic abundances of 26Al and 41Ca would produce large,measureable, and unobserved collateral effects on oxygen isotopes. Here wecalculate again the shifts in oxygen isotopes due to injection of supernovamaterial in the solar nebula, using a variety of nucleosynthetic conditions ofour own progenitor explosions. Unlike previous studies of this type, we alsoconsider the effect of non-homogeneity in abundance distribution of thenucleosynthesis products after the explosion. We calculate the shifts in oxygenisotopes due to injection of sufficient supernova material to produce themeteoritic abundances of 26Al and 41Ca, and analyze the predicted shifts indetail for compatibility with meteoritic data. We find that the range inpossible isotopic shifts is considerable and sensitive to parameters such asprogenitor mass and anisotropy of the explosion; however, a small number ofcompatible scenarios do exist. Because of the wide range of outcomes and thesensitivity of isotopic yields to assumed conditions, it is difficult toconstrain the supernova that may have led to injection of 26Al in the solarnebula. Conversely, we argue that the existence of viable counterexamplesdemonstrates that it is premature to use oxygen isotopes to rule out injectionof 26Al and 41Ca into the solar nebula protoplanetary disk by a nearbysupernova.

Collateral Effects on Solar Nebula Oxygen Isotopes due to Injection of 26Al by a Nearby Supernova