The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with 
Implications for the Nature of the Parent Planetesimal

Tang, Haolan; Young, Edward D.; Tafla, Lauren; Pack, Andreas; Di Rocco, Tommaso; Abe, Yoshinari; Aléon, Jérôme; O'D. Alexander, Conel M.; Amari, Sachiko; Amelin, Yuri; Bajo, Ken-ichi; Bizzarro, Martin; Bouvier, Audrey; Carlson, Richard W.; Chaussidon, Marc; Choi, Byeon-Gak; Dauphas, Nicolas; Davis, Andrew M.; Fujiya, Wataru; Fukai, Ryota; Gautam, Ikshu; Haba, Makiko K.; Hibiya, Yuki; Hidaka, Hiroshi; Homma, Hisashi; Hoppe, Peter; Huss, Gary R.; Ichida, Kiyohiro; Iizuka, Tsuyoshi; Ireland, Trevor R.; 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, Larry; Onose, Morihiko; Park, Changkun; Piani, Laurette; Qin, Liping; Russell, Sara S.; Sakamoto, Naoya; Schönbächler, Maria; Terada, Kentaro; Terada, Yasuko; Usui, Tomohiro; Wada, Sohei; Wadhwa, Meenakshi; Walker, Richard J.; Yamashita, Katsuyuki; Yin, Qing-Zhu; Yokoyama, Tetsuya; Yoneda, Shigekazu; Yui, Hiroharu; Zhang, Ai-Cheng; Nakamura, Tomoki; Naraoka, Hiroshi; Noguchi, Takaaki; Okazaki, Ryuji; Sakamoto, Kanako; Yabuta, Hikaru; Abe, Masanao; 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, Hisayoshi

doi:10.3847/PSJ/acea62

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学術論文

The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal

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Kleine, Thorsten
Planetary Science Department, Max Planck Institute for Solar System Research, Max Planck Society;

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https://ui.adsabs.harvard.edu/abs/2023PSJ.....4..144T
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引用

Tang, H., Young, E. D., Tafla, L., Pack, A., Di Rocco, T., Abe, Y., Aléon, J., O'D. Alexander, C. M., Amari, S., Amelin, Y., Bajo, K.-i., Bizzarro, M., Bouvier, A., Carlson, R. W., Chaussidon, M., Choi, B.-G., Dauphas, N., Davis, A. M., Fujiya, W., Fukai, R., Gautam, I., Haba, M. K., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G. R., Ichida, K., Iizuka, T., Ireland, T. R., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N. T., Kitajima, K., Kleine, T., Komatani, S., Krot, A. N., Liu, M.-C., Masuda, Y., McKeegan, K. D., Morita, M., Motomura, K., Moynier, F., Nagashima, K., Nakai, I., Nguyen, A., Nittler, L., Onose, M., Park, C., Piani, L., Qin, L., Russell, S. S., Sakamoto, N., Schönbächler, M., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R. J., Yamashita, K., Yin, Q.-Z., Yokoyama, T., Yoneda, S., Yui, H., Zhang, A.-C., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Abe, M., Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Yada, T., Yogata, K., Nakazawa, S., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S.-i., Yoshikawa, M., Tachibana, S., & Yurimoto, H. (2023). The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal. The Planetary Science Journal, 4, 144. doi:10.3847/PSJ/acea62.

引用: https://hdl.handle.net/21.11116/0000-000D-B2D2-C

要旨

We present oxygen isotopic analyses of fragments of the near-Earth C_b-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 ${{\rm{\Delta }}}^{{\prime} 17}{\rm{O}}$ 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.