학술논문
Presolar stardust in asteroid Ryugu
Document Type
Working Paper
Author
Barosch, Jens; Nittler, Larry R.; Wang, Jianhua; Alexander, Conel M. O'D.; De Gregorio, Bradley T.; Engrand, Cécile; Kebukawa, Yoko; Nagashima, Kazuhide; Stroud, Rhonda M.; Yabuta, Hikaru; Abe, Yoshinari; Aléon, Jérôme; Amari, Sachiko; Amelin, Yuri; Bajo, Ken-ichi; Bejach, Laure; Bizzarro, Martin; Bonal, Lydie; Bouvier, Audrey; Carlson, Richard W.; Chaussidon, Marc; Choi, Byeon-Gak; Cody, George D.; Dartois, Emmanuel; Dauphas, Nicolas; Davis, Andrew M.; Dazzi, Alexandre; Deniset-Besseau, Ariane; Di Rocco, Tommaso; Duprat, Jean; Fujiya, Wataru; Fukai, Ryota; Gautam, Ikshu; Haba, Makiko K.; Hashiguchi, Minako; Hibiya, Yuki; Hidaka, Hiroshi; Homma, Hisashi; Hoppe, Peter; Huss, Gary R.; Ichida, Kiyohiro; Iizuka, Tsuyoshi; Ireland, Trevor R.; Ishikawa, Akira; Ito, Motoo; Itoh, Shoichi; Kamide, Kanami; Kawasaki, Noriyuki; Kilcoyne, A. L. David; Kita, Noriko T.; Kitajima, Kouki; Kleine, Thorsten; Komatani, Shintaro; Komatsu, Mutsumi; Krot, Alexander N.; Liu, Ming-Chang; Martins, Zita; Masuda, Yuki; Mathurin, Jérémie; McKeegan, Kevin D.; Montagnac, Gilles; Morita, Mayu; Mostefaoui, Smail; Motomura, Kazuko; Moynier, Frédéric; Nakai, Izumi; Nguyen, Ann N.; Ohigashi, Takuji; Okumura, Taiga; Onose, Morihiko; Pack, Andreas; Park, Changkun; Piani, Laurette; Qin, Liping; Quirico, Eric; Remusat, Laurent; Russell, Sara S.; Sakamoto, Naoya; Sandford, Scott A.; Schönbächler, Maria; Shigenaka, Miho; Suga, Hiroki; Tafla, Lauren; Takahashi, Yoshio; Takeichi, Yasuo; Tamenori, Yusuke; Tang, Haolan; Terada, Kentaro; Terada, Yasuko; Usui, Tomohiro; Verdier-Paoletti, Maximilien; Wada, Sohei; Wadhwa, Meenakshi; Wakabayashi, Daisuke; Walker, Richard J.; Yamashita, Katsuyuki; Yamashita, Shohei; Yin, Qing-Zhu; Yokoyama, Tetsuya; Yoneda, Shigekazu; Young, Edward D.; Yui, Hiroharu; Zhang, Ai-Cheng; Abe, Masanao; Miyazaki, Akiko; Nakato, Aiko; Nakazawa, Satoru; Nishimura, Masahiro; Okada, Tatsuaki; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Tsuda, Yuichi; Watanabe, Sei-ichiro; Yada, Toru; Yogata, Kasumi; Yoshikawa, Makoto; Nakamura, Tomoki; Naraoka, Hiroshi; Noguchi, Takaaki; Okazaki, Ryuji; Sakamoto, Kanako; Tachibana, Shogo; Yurimoto, Hisayoshi
Source
2022, The Astrophysical Journal Letters, 935, L3 (12pp)
Subject
Language
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$^{+4.7}_{-2.6}$ ppm for O-anomalous grains, 25$^{+6}_{-5}$ ppm for SiC grains and 11$^{+5}_{-3}$ 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 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 $^{+7}_{-6}$ ppm SiC and 9.0$^{+5.3}_{-4.6}$ 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.
Comment: 12 pages, 3 figures, 2 tables. Published in ApJL
Comment: 12 pages, 3 figures, 2 tables. Published in ApJL