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

• 成果类型: Article
• 署名作者: Zeichner, Sarah S.; Aponte, Jose C.; Bhattacharjee, Surjyendu; Dong, Guannan; Hofmann, Amy E.; Dworkin, Jason P.; Glavin, Daniel P.; Elsila, Jamie E.; Graham, Heather V.; Naraoka, Hiroshi; Takano, Yoshinori; Tachibana, Shogo; Karp, Allison T.; Grice, Kliti; Holman, Alex I.; Freeman, Katherine H.; Yurimoto, Hisayoshi; Nakamura, Tomoki; Noguchi, Takaaki; Okazaki, Ryuji; Yabuta, Hikaru; Sakamoto, Kanako; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Nakazawa, Satoru; Watanabe, Sei-ichiro; Tsuda, Yuichi; Hamase, Kenji; Fukushima, Kazuhiko; Aoki, Dan; Hashiguchi, Minako; Mita, Hajime; Chikaraishi, Yoshito; Ohkouchi, Naohiko; Ogawa, Nanako O.; Sakai, Saburo; Parker, Eric T.; McLain, Hannah L.; Orthous-Daunay, Francois-Regis; Vuitton, Veronique; Wolters, Cedric; Schmitt-Kopplin, Philippe; Hertkorn, Norbert; Thissen, Roland; Ruf, Alexander; Isa, Junko; Oba, Yasuhiro; Koga, Toshiki; Yoshimura, Toshihiro; Araoka, Daisuke; Sugahara, Haruna; Furusho, Aogu; Furukawa, Yoshihiro; Aoki, Junken; Kano, Kuniyuki; Nomura, Shin-ichiro M.; Sasaki, Kazunori; Sato, Hajime; Yoshikawa, Takaaki; Tanaka, Satoru; Morita, Mayu; Onose, Morihiko; Kabashima, Fumie; Fujishima, Kosuke; Yamazaki, Tomoya; Kimura, Yuki; Eiler, John M.
• 署名单位: California Institute of Technology; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; California Institute of Technology; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); Kyushu University; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); University of Tokyo; Japan Aerospace Exploration Agency (JAXA); Institute of Space & Astronautical Science (ISAS); Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; Yale University; Brown University; Curtin University; Hokkaido University; Tohoku University; Kyoto University; Hiroshima University; Graduate University for Advanced Studies - Japan; University of Tokyo; Kanagawa Institute Technology; Nagoya University; Kyushu University; Nagoya University; Fukuoka Institute of Technology; Hokkaido University; Institut de Planetologie et d'Astrophysique de Grenoble (IPAG); Communaute Universite Grenoble Alpes; Universite Grenoble Alpes (UGA); Centre National de la Recherche Scientifique (CNRS); Helmholtz Association; Helmholtz-Center Munich - German Research Center for Environmental Health; Technical University of Munich; Max Planck Society; Linkoping University; Universite Paris Saclay; Centre National de la Recherche Scientifique (CNRS); Aix-Marseille Universite; Centre National de la Recherche Scientifique (CNRS); University of Munich; Institute of Science Tokyo; Tokyo Institute of Technology; Chiba Institute of Technology; National Institute of Advanced Industrial Science & Technology (AIST); Kyushu University; University of Tokyo; Tohoku University; Keio University; Horiba Ltd.; Keio University; Hiroshima University; University of Shizuoka
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12688
• DOI: 10.1126/science.adg6304
• 发表日期: 2023-12-22
• 页码: 1411-1415
• 关键词: carbon-isotope fractionation; compound-specific carbon; organic-compounds; parent-body; gas-phase; hydrogen; chondrites; pathways; cm; nucleosynthesis

摘要

Polycyclic aromatic hydrocarbons (PAHs) contain less than or similar to 20% of the carbon in the interstellar medium. They are potentially produced in circumstellar environments (at temperatures greater than or similar to 1000 kelvin), by (similar to 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-C-13 substituted compositions (Delta 2x(13)C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51 parts per thousand higher than values expected for a stochastic distribution of isotopes. The Delta 2x(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 Delta 2x(13)C values consistent with formation by higher-temperature reactions.