{"paper":{"title":"Presolar stardust in asteroid Ryugu","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Ai-Cheng Zhang, Aiko Nakato, Akiko Miyazaki, Akira Ishikawa, A. L. David Kilcoyne, Alexander N. Krot, Alexandre Dazzi, Andreas Pack, Andrew M. Davis, Ann N. Nguyen, Ariane Deniset-Besseau, Audrey Bouvier, Bradley T. De Gregorio, Byeon-Gak Choi, C\\'ecile Engrand, Changkun Park, Conel M. O'D. Alexander, Daisuke Wakabayashi, Edward D. Young, Emmanuel Dartois, Eric Quirico, Fr\\'ed\\'eric Moynier, Fuyuto Terui, Gary R. Huss, George D. Cody, Gilles Montagnac, Haolan Tang, Hikaru Yabuta, Hiroharu Yui, Hiroki Suga, Hiroshi Hidaka, Hiroshi Naraoka, Hisashi Homma, Hisayoshi Yurimoto, Ikshu Gautam, Izumi Nakai, Jean Duprat, Jens Barosch, J\\'er\\'emie Mathurin, J\\'er\\^ome Al\\'eon, Jianhua Wang, Kanako Sakamoto, Kanami Kamide, Kasumi Yogata, Katsuyuki Yamashita, Kazuhide Nagashima, Kazuko Motomura, Ken-ichi Bajo, Kentaro Terada, Kevin D. McKeegan, Kiyohiro Ichida, Kouki Kitajima, Larry R. Nittler, Laure Bejach, Lauren Tafla, Laurent Remusat, Laurette Piani, Liping Qin, Lydie Bonal, Makiko K. Haba, Makoto Yoshikawa, Marc Chaussidon, Maria Sch\\\"onb\\\"achler, Martin Bizzarro, Masahiro Nishimura, Masanao Abe, Maximilien Verdier-Paoletti, Mayu Morita, Meenakshi Wadhwa, Miho Shigenaka, Minako Hashiguchi, Ming-Chang Liu, Morihiko Onose, Motoo Ito, Mutsumi Komatsu, Naoya Sakamoto, Nicolas Dauphas, Noriko T. Kita, Noriyuki Kawasaki, Peter Hoppe, Qing-zhu Yin, Rhonda M. Stroud, Richard J. Walker, Richard W. Carlson, Ryota Fukai, Ryuji Okazaki, Sachiko Amari, Sara S. Russell, Satoru Nakazawa, Satoshi Tanaka, Scott A. Sandford, Sei-ichiro Watanabe, Shigekazu Yoneda, Shintaro Komatani, Shogo Tachibana, Shohei Yamashita, Shoichi Itoh, Smail Mostefaoui, Sohei Wada, Taiga Okumura, Takaaki Noguchi, Takanao Saiki, Takuji Ohigashi, Tatsuaki Okada, Tetsuya Yokoyama, Thorsten Kleine, Tommaso Di Rocco, Tomohiro Usui, Tomoki Nakamura, Toru Yada, Trevor R. Ireland, Tsuyoshi Iizuka, Wataru Fujiya, Yasuko Terada, Yasuo Takeichi, Yoko Kebukawa, Yoshinari Abe, Yoshio Takahashi, Yuichi Tsuda, Yuki Hibiya, Yuki Masuda, Yuri Amelin, Yusuke Tamenori, Zita Martins","submitted_at":"2022-08-16T22:29:35Z","abstract_excerpt":"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 lo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.07976","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2208.07976/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}