Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples

Samples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed 17 Ryugu samples measuring 1 to 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent asteroid formed in the outer S...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2023-02, Vol.379 (6634), p.eabn8671-eabn8671
Hauptverfasser:	Nakamura, T, Matsumoto, M, Amano, K, Enokido, Y, Zolensky, M E, Mikouchi, T, Genda, H, Tanaka, S, Zolotov, M Y, Kurosawa, K, Wakita, S, Hyodo, R, Nagano, H, Nakashima, D, Takahashi, Y, Fujioka, Y, Kikuiri, M, Kagawa, E, Matsuoka, M, Brearley, A J, Tsuchiyama, A, Uesugi, M, Matsuno, J, Kimura, Y, Sato, M, Milliken, R E, Tatsumi, E, Sugita, S, Hiroi, T, Kitazato, K, Brownlee, D, Joswiak, D J, Takahashi, M, Ninomiya, K, Takahashi, T, Osawa, T, Terada, K, Brenker, F E, Tkalcec, B J, Vincze, L, Brunetto, R, Aléon-Toppani, A, Chan, Q H S, Roskosz, M, Viennet, J-C, Beck, P, Alp, E E, Michikami, T, Nagaashi, Y, Tsuji, T, Ino, Y, Martinez, J, Han, J, Dolocan, A, Bodnar, R J, Tanaka, M, Yoshida, H, Sugiyama, K, King, A J, Fukushi, K, Suga, H, Yamashita, S, Kawai, T, Inoue, K, Nakato, A, Noguchi, T, Vilas, F, Hendrix, A R, Jaramillo-Correa, C, Domingue, D L, Dominguez, G, Gainsforth, Z, Engrand, C, Duprat, J, Russell, S S, Bonato, E, Ma, C, Kawamoto, T, Wada, T, Watanabe, S, Endo, R, Enju, S, Riu, L, Rubino, S, Tack, P, Takeshita, S, Takeichi, Y, Takeuchi, A, Takigawa, A, Takir, D, Tanigaki, T, Taniguchi, A, Tsukamoto, K, Yagi, T, Yamada, S, Yamamoto, K, Yamashita, Y, Yasutake, M, Uesugi, K, Umegaki, I
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTRONOMY AND ASTROPHYSICS Sciences of the Universe
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Zusammenfassung:	Samples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed 17 Ryugu samples measuring 1 to 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent asteroid formed in the outer Solar System. The samples contain low abundances of materials that formed at high temperatures, such as chondrules and calcium- and aluminum-rich inclusions. The samples are rich in phyllosilicates and carbonates, which formed through aqueous alteration reactions at low temperature, high pH, and water/rock ratios of
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.abn8671