| Literature DB >> 35691845 |
Eizo Nakamura1, Katsura Kobayashi1, Ryoji Tanaka1, Tak Kunihiro1, Hiroshi Kitagawa1, Christian Potiszil1, Tsutomu Ota1, Chie Sakaguchi1, Masahiro Yamanaka1, Dilan M Ratnayake1, Havishk Tripathi1, Rahul Kumar1, Maya-Liliana Avramescu1, Hidehisa Tsuchida1, Yusuke Yachi1, Hitoshi Miura2, Masanao Abe3,4, Ryota Fukai3, Shizuho Furuya3,5, Kentaro Hatakeda3, Tasuku Hayashi3, Yuya Hitomi3,6, Kazuya Kumagai3,6, Akiko Miyazaki3, Aiko Nakato3, Masahiro Nishimura3, Tatsuaki Okada3,5, Hiromichi Soejima3,6, Seiji Sugita5,7, Ayako Suzuki3,6, Tomohiro Usui3, Toru Yada3, Daiki Yamamoto3, Kasumi Yogata3, Miwa Yoshitake3, Masahiko Arakawa8, Atsushi Fujii3, Masahiko Hayakawa3, Naoyuki Hirata8, Naru Hirata9, Rie Honda10, Chikatoshi Honda9, Satoshi Hosoda3, Yu-Ichi Iijima3, Hitoshi Ikeda11, Masateru Ishiguro12, Yoshiaki Ishihara3, Takahiro Iwata3,4, Kosuke Kawahara3, Shota Kikuchi3,7, Kohei Kitazato9, Koji Matsumoto13, Moe Matsuoka3,14, Tatsuhiro Michikami15, Yuya Mimasu3, Akira Miura3, Tomokatsu Morota16, Satoru Nakazawa3, Noriyuki Namiki13, Hirotomo Noda13, Rina Noguchi3,17, Naoko Ogawa3,18, Kazunori Ogawa3, Chisato Okamoto8, Go Ono11, Masanobu Ozaki3, Takanao Saiki3, Naoya Sakatani19, Hirotaka Sawada3, Hiroki Senshu7, Yuri Shimaki3, Kei Shirai3,8, Yuto Takei3, Hiroshi Takeuchi3, Satoshi Tanaka3,4,20, Eri Tatsumi5,21, Fuyuto Terui3,22, Ryudo Tsukizaki3, Koji Wada7, Manabu Yamada7, Tetsuya Yamada3, Yukio Yamamoto3, Hajime Yano3, Yasuhiro Yokota3, Keisuke Yoshihara3, Makoto Yoshikawa3,4, Kent Yoshikawa11, Masaki Fujimoto3, Sei-Ichiro Watanabe16, Yuichi Tsuda3,5.
Abstract
Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned from the C-type asteroid Ryugu by the Hayabusa2 mission. On average Ryugu particles consist of 50% phyllosilicate matrix, 41% porosity and 9% minor phases, including organic matter. The abundances of 70 elements from the particles are in close agreement with those of CI chondrites. Bulk Ryugu particles show higher δ18O, Δ17O, and ε54Cr values than CI chondrites. As such, Ryugu sampled the most primitive and least-thermally processed protosolar nebula reservoirs. Such a finding is consistent with multi-scale H-C-N isotopic compositions that are compatible with an origin for Ryugu organic matter within both the protosolar nebula and the interstellar medium. The analytical data obtained here, suggests that complex soluble organic matter formed during aqueous alteration on the Ryugu progenitor planetesimal (several 10's of km), <2.6 Myr after CAI formation. Subsequently, the Ryugu progenitor planetesimal was fragmented and evolved into the current asteroid Ryugu through sublimation.Entities:
Keywords: Hayabusa2; Ryugu; comprehensive analysis; interstellar medium; protosolar nebula; sample return
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Year: 2022 PMID： 35691845 DOI： 10.2183/pjab.98.015
Source DB: PubMed Journal: Proc Jpn Acad Ser B Phys Biol Sci ISSN： 0386-2208 Impact factor: 3.493