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Presolar Stardust in Asteroid Ryugu

Jens Barosch Larry R. Nittler Jianhua Wang Conel M. O'D. Alexander Bradley T. de Gregorio Cécile Engrand 1 Yoko Kebukawa Kazuhide Nagashima Rhonda M. Stroud Hikaru Yabuta Yoshinari Abe Jérôme Aléon 2 Sachiko Amari Yuri Amelin Ken-Ichi Bajo Laure Bejach 1 Martin Bizzarro Lydie Bonal 3 Audrey Bouvier Richard W. Carlson Marc Chaussidon 4 Byeon-Gak Choi George D. Cody Emmanuel Dartois 5 Nicolas Dauphas Andrew M. Davis Alexandre Dazzi 6 Ariane Deniset-Besseau 6 Tommaso Di Rocco Jean Duprat 2 Wataru Fujiya Ryota Fukai Ikshu Gautam Makiko K. Haba Minako Hashiguchi Yuki Hibiya Hiroshi Hidaka Hisashi Homma Peter Hoppe Gary R. Huss Kiyohiro Ichida Tsuyoshi Iizuka Trevor R. Ireland Akira Ishikawa Motoo Ito Shoichi Itoh Kanami Kamide Noriyuki Kawasaki A. L. David Kilcoyne Noriko T. Kita Kouki Kitajima Thorsten Kleine Shintaro Komatani Mutsumi Komatsu Alexander N. Krot Ming-Chang Liu Zita Martins Yuki Masuda Jérémie Mathurin 6 Kevin D. Mckeegan Gilles Montagnac 7 Mayu Morita Smail Mostefaoui 2 Kazuko Motomura Frédéric Moynier 4 Izumi Nakai Ann N. Nguyen Takuji Ohigashi Taiga Okumura Morihiko Onose Andreas Pack Changkun Park Laurette Piani 8 Liping Qin Eric Quirico 3 Laurent Remusat 2 Sara S. Russell Naoya Sakamoto Scott A. Sandford Maria Schönbächler Miho Shigenaka Hiroki Suga Lauren Tafla Yoshio Takahashi Yasuo Takeichi Yusuke Tamenori Haolan Tang Kentaro Terada Yasuko Terada Tomohiro Usui Maximilien Verdier-Paoletti 2 Sohei Wada Meenakshi Wadhwa Daisuke Wakabayashi Richard J. Walker Katsuyuki Yamashita Shohei Yamashita Qing-Zhu Yin Tetsuya Yokoyama Shigekazu Yoneda Edward D. Young Hiroharu Yui Ai-Cheng Zhang Masanao Abe Akiko Miyazaki Aiko Nakato Satoru Nakazawa Masahiro Nishimura Tatsuaki Okada Takanao Saiki Satoshi Tanaka Fuyuto Terui Yuichi Tsuda Sei-Ichiro Watanabe Toru Yada Kasumi Yogata Makoto Yoshikawa Tomoki Nakamura Hiroshi Naraoka Takaaki Noguchi Ryuji Okazaki Kanako Sakamoto Shogo Tachibana Hisayoshi Yurimoto 
Abstract : We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. We report the detection of all major presolar grain types with O- and C-anomalous isotopic compositions typically identified in carbonaceous chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the carbonaceous grains are presolar graphites, whereas several grains with moderate C isotopic anomalies are probably organics. The presolar silicate was located in a clast with a less altered lithology than the typical extensively aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances in Ryugu are ${4.8}_{-2.6}^{+4.7}$ ppm for O-anomalous grains, ${25}_{-5}^{+6}$ ppm for SiC grains, and ${11}_{-3}^{+5}$ ppm for carbonaceous grains. Ryugu is isotopically and petrologically similar to carbonaceous Ivuna-type (CI) chondrites. To compare the in situ presolar grain abundances of Ryugu with CI chondrites, we also mapped Ivuna and Orgueil samples and found a total of 15 SiC grains and 6 carbonaceous grains. No O-anomalous grains were detected. The matrix-normalized presolar grain abundances in the CI chondrites are similar to those in Ryugu: ${23}_{-6}^{+7}$ ppm SiC and ${9.0}_{-3.6}^{+5.4}$ ppm carbonaceous grains. Thus, our results provide further evidence in support of the Ryugu-CI connection. They also reveal intriguing hints of small-scale heterogeneities in the Ryugu samples, such as locally distinct degrees of alteration that allowed the preservation of delicate presolar material.
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Submitted on : Tuesday, September 13, 2022 - 5:03:18 PM
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Jens Barosch, Larry R. Nittler, Jianhua Wang, Conel M. O'D. Alexander, Bradley T. de Gregorio, et al.. Presolar Stardust in Asteroid Ryugu. The Astrophysical Journal Letters, 2022, 935, ⟨10.3847/2041-8213/ac83bd⟩. ⟨insu-03776407⟩

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