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Presolar grains in meteorites and interplanetary dust particles (IDPs) carrynon-solar isotopic signatures pointing to origins in supernovae, giant stars,and possibly other stellar sources. There have been suggestions that some ofthese grains condensed in the ejecta of classical nova outbursts, but theevidence is ambiguous. We report neon and helium compositions in particlescaptured on stratospheric collectors flown to sample materials from comets26P/Grigg-Skjellerup and 55P/Tempel-Tuttle that point to condensation of theirgas carriers in the ejecta of a neon (ONe) nova. The absence of detectable 3Hein these particles indicates space exposure to solar wind (SW) irradiation of afew decades at most, consistent with origins in cometary dust streams. Measured4He/20Ne, 20Ne/22Ne, 21Ne/22Ne and 20Ne/21Ne isotope ratios, and a low upperlimit on 3He/4He, are in accord with calculations of nucleosynthesis in neonnova outbursts. Of these, the uniquely low 4He/20Ne and high 20Ne/22Ne ratiosare the most diagnostic, reflecting the large predicted 20Ne abundances in theejecta of such novae. The correspondence of measured Ne and He compositions incometary matter with theoretical predictions is evidence for the presence ofpresolar grains from novae in the early solar system.

Presolar Grains from Novae: Evidence from Neon and Helium Isotopes in Comet Dust Collections