Condensation of SiC Stardust in CO Nova Outbursts

    Research output: Contribution to journalArticle

    Abstract

    This study on presolar grains compares high-precision isotopic compositions of individual SiC grains with low 12 C/ 13 C ratios, low 14 N/ 15 N ratios, large 30 Si excesses, and high 26 Al/ 27 Al ratios, all available in the presolar grain database, to new CO nova models with white dwarf (WD) masses from 0.6 to 1.35 M o . The models were designed to match the Large Binocular Telescope high-dispersion spectra acquired for nova V5668 Sgr. These CO nova models provide elemental abundances up to calcium and include mixing of WD material into the accreted material in a binary star system under several scenarios, including one where mixing occurs only after temperatures >7 ×10 7 K are achieved during a thermonuclear runaway (TNR). The 0.8-1.35 M o simulations where 25% of the WD core matter mixes with 75% of the accreted material (assumed solar) from its binary companion after the TNR has begun provide the best fits to the measured isotopic data in four presolar grains. One grain matches the 50% accreted 50% solar 1.35 M o simulation. For these five presolar grains, less than 25% of solar system material is required to be mixed with the CO nova ejecta to account for the grains' compositions. Thus, our study reports evidence of pure CO nova ejecta material in meteorites. Finally, we speculate that SiC grains can form in the winds of cool and dense CO novae, where the criterion C > O may not be locally imposed, and thus nova winds can be chemically inhomogeneous.

    Original languageEnglish (US)
    Article number14
    JournalAstrophysical Journal
    Volume873
    Issue number1
    DOIs
    StatePublished - Jan 1 2019

    Fingerprint

    outburst
    condensation
    ejecta
    meteorite
    solar system
    simulation
    isotopic composition
    novae
    calcium
    material
    binary stars
    meteorites
    telescopes
    temperature

    Keywords

    • meteorites, meteors, meteoroids
    • novae, cataclysmic variables
    • nuclear reactions, nucleosynthesis, abundances
    • supernovae: general

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Condensation of SiC Stardust in CO Nova Outbursts. / Bose, Maitrayee; Starrfield, Sumner.

    In: Astrophysical Journal, Vol. 873, No. 1, 14, 01.01.2019.

    Research output: Contribution to journalArticle

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