Presolar Stardust in Asteroid Ryugu

Barosch, Jens and Nittler, Larry R. and Wang, Jianhua and O’D. Alexander, Conel M. and De Gregorio, Bradley T. and Engrand, Cécile and Kebukawa, Yoko and Nagashima, Kazuhide and Stroud, Rhonda M. and Yabuta, Hikaru and Abe, Yoshinari and Aléon, Jérôme and Amari, Sachiko and Amelin, Yuri and Bajo, Ken-ichi and Bejach, Laure and Bizzarro, Martin and Bonal, Lydie and Bouvier, Audrey and Carlson, Richard W. and Chaussidon, Marc and Choi, Byeon-Gak and Cody, George D. and Dartois, Emmanuel and Dauphas, Nicolas and Davis, Andrew M. and Dazzi, Alexandre and Deniset-Besseau, Ariane and Di Rocco, Tommaso and Duprat, Jean and Fujiya, Wataru and Fukai, Ryota and Gautam, Ikshu and Haba, Makiko K. and Hashiguchi, Minako and Hibiya, Yuki and Hidaka, Hiroshi and Homma, Hisashi and Hoppe, Peter and Huss, Gary R. and Ichida, Kiyohiro and Iizuka, Tsuyoshi and Ireland, Trevor R. and Ishikawa, Akira and Ito, Motoo and Itoh, Shoichi and Kamide, Kanami and Kawasaki, Noriyuki and David Kilcoyne, A. L. and Kita, Noriko T. and Kitajima, Kouki and Kleine, Thorsten and Komatani, Shintaro and Komatsu, Mutsumi and Krot, Alexander N. and Liu, Ming-Chang and Martins, Zita and Masuda, Yuki and Mathurin, Jérémie and McKeegan, Kevin D. and Montagnac, Gilles and Morita, Mayu and Mostefaoui, Smail and Motomura, Kazuko and Moynier, Frédéric and Nakai, Izumi and Nguyen, Ann N. and Ohigashi, Takuji and Okumura, Taiga and Onose, Morihiko and Pack, Andreas and Park, Changkun and Piani, Laurette and Qin, Liping and Quirico, Eric and Remusat, Laurent and Russell, Sara S. and Sakamoto, Naoya and Sandford, Scott A. and Schönbächler, Maria and Shigenaka, Miho and Suga, Hiroki and Tafla, Lauren and Takahashi, Yoshio and Takeichi, Yasuo and Tamenori, Yusuke and Tang, Haolan and Terada, Kentaro and Terada, Yasuko and Usui, Tomohiro and Verdier-Paoletti, Maximilien and Wada, Sohei and Wadhwa, Meenakshi and Wakabayashi, Daisuke and Walker, Richard J. and Yamashita, Katsuyuki and Yamashita, Shohei and Yin, Qing-Zhu and Yokoyama, Tetsuya and Yoneda, Shigekazu and Young, Edward D. and Yui, Hiroharu and Zhang, Ai-Cheng and Abe, Masanao and Miyazaki, Akiko and Nakato, Aiko and Nakazawa, Satoru and Nishimura, Masahiro and Okada, Tatsuaki and Saiki, Takanao and Tanaka, Satoshi and Terui, Fuyuto and Tsuda, Yuichi and Watanabe, Sei-ichiro and Yada, Toru and Yogata, Kasumi and Yoshikawa, Makoto and Nakamura, Tomoki and Naraoka, Hiroshi and Noguchi, Takaaki and Okazaki, Ryuji and Sakamoto, Kanako and Tachibana, Shogo and Yurimoto, Hisayoshi (2022) Presolar Stardust in Asteroid Ryugu. The Astrophysical Journal Letters, 935 (1). L3. ISSN 2041-8205

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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.

Item Type: Article
Subjects: Afro Asian Archive > Physics and Astronomy
Depositing User: Unnamed user with email support@afroasianarchive.com
Date Deposited: 25 Apr 2023 07:06
Last Modified: 07 Sep 2024 10:41
URI: http://info.stmdigitallibrary.com/id/eprint/542

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