Presolar Stardust in Asteroid Ryugu
2022-08-09 | journal article; research paper. A publication with affiliation to the University of Göttingen.
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Presolar Stardust in Asteroid Ryugu
Barosch, J.; Nittler, L. R.; Wang, J.; O’D. Alexander, C. M.; De Gregorio, B. T.; Engrand, C. & Kebukawa, Y. et al. (2022)
The Astrophysical Journal Letters, 935(1) art. L3. DOI: https://doi.org/10.3847/2041-8213/ac83bd
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- Authors
- Barosch, Jens; Nittler, Larry R.; Wang, Jianhua; O’D. Alexander, Conel M.; 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; David Kilcoyne, A. L.; 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
- Abstract
- AbstractWe 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.
- Issue Date
- 9-August-2022
- Journal
- The Astrophysical Journal Letters
- ISSN
- 2041-8205
- eISSN
- 2041-8213
- Language
- English
- Sponsor
- NASA
NASA