View Item 

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
ISSN
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
Collection
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.