The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal
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Published:2023-08-01
Issue:8
Volume:4
Page:144
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ISSN:2632-3338
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Container-title:The Planetary Science Journal
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language:
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Short-container-title:Planet. Sci. J.
Author:
Tang HaolanORCID, Young Edward D.ORCID, Tafla Lauren, Pack Andreas, Di Rocco Tommaso, Abe Yoshinari, Aléon Jérôme, M. O’D. Alexander Conel, Amari SachikoORCID, Amelin Yuri, Bajo Ken-ichi, Bizzarro Martin, Bouvier AudreyORCID, Carlson Richard W.ORCID, Chaussidon MarcORCID, Choi Byeon-Gak, Dauphas Nicolas, Davis Andrew M., Fujiya WataruORCID, Fukai RyotaORCID, Gautam Ikshu, Haba Makiko K., Hibiya Yuki, Hidaka HiroshiORCID, Homma Hisashi, Hoppe Peter, Huss Gary R., Ichida Kiyohiro, Iizuka Tsuyoshi, Ireland Trevor R.ORCID, Ishikawa Akira, Ito Motoo, Itoh Shoichi, Kawasaki Noriyuki, Kita Noriko T., Kitajima Kouki, Kleine Thorsten, Komatani Shintaro, Krot Alexander N., Liu Ming-Chang, Masuda Yuki, McKeegan Kevin D., Morita Mayu, Motomura Kazuko, Moynier Frédéric, Nagashima Kazuhide, Nakai Izumi, Nguyen Ann, Nittler LarryORCID, Onose Morihiko, Park ChangkunORCID, Piani Laurette, Qin Liping, Russell Sara S., Sakamoto Naoya, Schönbächler Maria, Terada Kentaro, Terada Yasuko, Usui Tomohiro, Wada Sohei, Wadhwa Meenakshi, Walker Richard J.ORCID, Yamashita Katsuyuki, Yin Qing-Zhu, Yokoyama TetsuyaORCID, Yoneda ShigekazuORCID, Yui Hiroharu, Zhang Ai-Cheng, Nakamura Tomoki, Naraoka Hiroshi, Noguchi Takaaki, Okazaki Ryuji, Sakamoto Kanako, Yabuta Hikaru, Abe MasanaoORCID, Miyazaki Akiko, Nakato Aiko, Nishimura Masahiro, Okada Tatsuaki, Yada Toru, Yogata Kasumi, Nakazawa Satoru, Saiki Takanao, Tanaka Satoshi, Terui Fuyuto, Tsuda Yuichi, Watanabe Sei-ichiro, Yoshikawa Makoto, Tachibana Shogo, Yurimoto HisayoshiORCID
Abstract
Abstract
We present oxygen isotopic analyses of fragments of the near-Earth Cb-type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu samples and CI chondrites in
Δ
′
17
O
can be explained at least in part by contamination of the latter by terrestrial water. The discovery that a randomly sampled C-complex asteroid is composed of CI-chondrite-like rock, combined with thermal models for formation prior to significant decay of the short-lived radioisotope 26Al, suggests that if lithified at the time of alteration, the parent body was small (≪50 km radius). If the parent planetesimal was large (>50 km in radius), it was likely composed of high-permeability, poorly lithified sediment rather than consolidated rock.
Funder
National Aeronautics and Space Administration MOST ∣ National Natural Science Foundation of China
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Geophysics,Astronomy and Astrophysics
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