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Published in

American Association for the Advancement of Science, Science, 6677(382), p. 1411-1416, 2023

DOI: 10.1126/science.adg6304

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

Journal article published in 2023 by Sarah S. Zeichner ORCID, José C. Aponte ORCID, Surjyendu Bhattacharjee ORCID, Guannan Dong ORCID, Amy E. Hofmann ORCID, Jason P. Dworkin ORCID, Daniel P. Glavin ORCID, Jamie E. Elsila ORCID, Heather V. Graham ORCID, Hiroshi Naraoka ORCID, Yoshinori Takano ORCID, Shogo Tachibana ORCID, Allison T. Karp ORCID, Kliti Grice, Alex I. Holman ORCID and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

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 (~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- 13 C substituted compositions (Δ2× 13 C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51‰ higher than values expected for a stochastic distribution of isotopes. The Δ2× 13 C 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 Δ2× 13 C values consistent with formation by higher-temperature reactions.