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    Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium

    Access Status
    In process
    Authors
    Zeichner, S.S.
    Aponte, J.C.
    Bhattacharjee, S.
    Dong, G.
    Hofmann, A.E.
    Dworkin, J.P.
    Glavin, D.P.
    Elsila, J.E.
    Graham, H.V.
    Naraoka, H.
    Takano, Y.
    Tachibana, S.
    Karp, A.T.
    Grice, Kliti
    Holman, Alex
    Freeman, K.H.
    Yurimoto, H.
    Nakamura, T.
    Noguchi, T.
    Okazaki, R.
    Yabuta, H.
    Sakamoto, K.
    Yada, T.
    Nishimura, M.
    Nakato, A.
    Miyazaki, A.
    Yogata, K.
    Abe, M.
    Okada, T.
    Usui, T.
    Yoshikawa, M.
    Saiki, T.
    Tanaka, S.
    Terui, F.
    Nakazawa, S.
    Watanabe, S.I.
    Tsuda, Y.
    Hamase, K.
    Fukushima, K.
    Aoki, D.
    Hashiguchi, M.
    Mita, H.
    Chikaraishi, Y.
    Ohkouchi, N.
    Ogawa, N.O.
    Sakai, S.
    Parker, E.T.
    McLain, H.L.
    Orthous-Daunay, F.R.
    Vuitton, V.
    Wolters, C.
    Schmitt-Kopplin, P.
    Hertkorn, N.
    Thissen, R.
    Ruf, A.
    Isa, J.
    Oba, Y.
    Koga, T.
    Yoshimura, T.
    Araoka, D.
    Sugahara, H.
    Furusho, A.
    Furukawa, Y.
    Aoki, J.
    Kano, K.
    Nomura, S.I.M.
    Sasaki, K.
    Sato, H.
    Yoshikawa, T.
    Tanaka, S.
    Morita, M.
    Onose, M.
    Kabashima, F.
    Fujishima, K.
    Yamazaki, T.
    Kimura, Y.
    Eiler, J.M.
    Date
    2023
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zeichner, S.S. and Aponte, J.C. and Bhattacharjee, S. and Dong, G. and Hofmann, A.E. and Dworkin, J.P. and Glavin, D.P. et al. 2023. Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium. Science. 382 (6677): pp. 1411-1416.
    Source Title
    Science
    DOI
    10.1126/science.adg6304
    ISSN
    0036-8075
    Faculty
    Faculty of Science and Engineering
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/96506
    Collection
    • Curtin Research Publications
    Abstract

    Polycyclic aromatic hydrocarbons (PAHs) contain ≲20% of the carbon in the interstellar medium. They are potentially produced in circumstellar environments (at temperatures ≳1000 kelvin), by reactions within cold (~10 kelvin) interstellar clouds, or by processing of carbon-rich dust grains. We report isotopic properties of PAHs extracted from samples of the asteroid Ryugu and the meteorite Murchison. The doubly-13C substituted compositions (D2×13C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51% higher than values expected for a stochastic distribution of isotopes. The D2×13C values are higher than expected if the PAHs formed in a circumstellar environment, but consistent with formation in the interstellar medium. By contrast, the PAHs phenanthrene and anthracene in Ryugu samples have D2×13C values consistent with formation by higher-temperature reactions.

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