Article Dans Une Revue Science Année : 2023

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

Sarah Zeichner
José Aponte
Surjyendu Bhattacharjee
Guannan Dong
Amy Hofmann
Daniel Glavin
Jamie Elsila
Heather Graham
Hiroshi Naraoka
Allison Karp
Alex Holman
Katherine Freeman
Tomoki Nakamura
Takaaki Noguchi
Ryuji Okazaki
Hikaru Yabuta
Kanako Sakamoto
Toru Yada
Masahiro Nishimura
Aiko Nakato
Akiko Miyazaki
Kasumi Yogata
Masanao Abe
Tatsuaki Okada
Tomohiro Usui
Makoto Yoshikawa
Takanao Saiki
Satoshi Tanaka
Fuyuto Terui
Satoru Nakazawa
Sei-Ichiro Watanabe
Yuichi Tsuda
Kenji Hamase
Kazuhiko Fukushima
  • Fonction : Auteur
Dan Aoki
Minako Hashiguchi
Hajime Mita
Yoshito Chikaraishi
Naohiko Ohkouchi
Nanako Ogawa
Saburo Sakai
Eric Parker
Hannah Mclain
Philippe Schmitt-Kopplin
  • Fonction : Auteur
Norbert Hertkorn
Roland Thissen
Junko Isa
Yasuhiro Oba
Toshiki Koga
Toshihiro Yoshimura
Daisuke Araoka
Haruna Sugahara
Aogu Furusho
Yoshihiro Furukawa
Junken Aoki
Kuniyuki Kano
Shin-Ichiro Nomura
Kazunori Sasaki
Hajime Sato
Takaaki Yoshikawa
Satoru Tanaka
Mayu Morita
Morihiko Onose
Fumie Kabashima
Kosuke Fujishima
Tomoya Yamazaki
Yuki Kimura
John Eiler

Résumé

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

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hal-04441167 , version 1 (18-11-2024)

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Sarah Zeichner, José Aponte, Surjyendu Bhattacharjee, Guannan Dong, Amy Hofmann, et al.. Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium. Science, 2023, 382 (6677), pp.1411-1416. ⟨10.1126/science.adg6304⟩. ⟨hal-04441167⟩
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