Faculty Profiles - WATANABE, Sei-ichiro

Papers - WATANABE, Sei-ichiro

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The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites Reviewed International coauthorship International journal

Fridolin Spitzer, Thorsten Kleine, Christoph Burkhardt, Timo Hopp, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. O’D Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Mayu Morita, Fréderic Moynier, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Science Advances Vol. 10 ( 39 ) 2024.9

Language：English Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science (AAAS)

The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI chondrites formed in a different region of the accretion disk, possibly around the orbits of Uranus and Neptune. We show that, like for Fe, Ryugu and CI chondrites also have indistinguishable Ni isotope anomalies, which differ from those of other carbonaceous chondrites. We propose that this unique Fe and Ni isotopic composition reflects different accretion efficiencies of small FeNi metal grains among the carbonaceous chondrite parent bodies. The CI chondrites incorporated these grains more efficiently, possibly because they formed at the end of the disk’s lifetime, when planetesimal formation was also triggered by photoevaporation of the disk. Isotopic variations among carbonaceous chondrites may thus reflect fractionation of distinct dust components from a common reservoir, implying CI chondrites/Ryugu may have formed in the same region of the accretion disk as other carbonaceous chondrites.

DOI： 10.1126/sciadv.adp2426

Web of Science

PubMed

Phosphorus-rich grains in Ryugu samples with major biochemical potential Reviewed International coauthorship International journal

Pilorget, C; Baklouti, D; Bibring, JP; Brunetto, R; Ito, M; Franchi, I; Tomioka, N; Uesugi, M; Yamaguchi, A; Greenwood, R; Okada, T; Usui, T; Yada, T; Hatakeda, K; Yogata, K; Loizeau, D; Le Pivert-Jolivet, T; Jiang, T; Carter, J; Hamm, V; Abe, M; Aléon-Toppani, A; Borondics, F; Enokido, Y; Hitomi, Y; Imae, N; Karouji, Y; Kumagai, K; Kimura, M; Langevin, Y; Lantz, C; Liu, MC; Mahlke, M; Miyazaki, A; Mughal, Z; Nagashima, K; Nakano, A; Nakata, A; Nakato, A; Nishimura, M; Ohigashi, T; Ojima, T; Poulet, F; Riu, L; Shirai, N; Sugiyama, Y; Tahara, R; Uesugi, K; Yasutake, M; Yuzawa, H; Moussi-Soffys, A; Nakazawa, S; Saiki, T; Terui, F; Yoshikawa, M; Tanaka, S; Watanabe, S; Tsuda, Y

NATURE ASTRONOMY 2024.9

Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu Reviewed International coauthorship International journal

Yoshimura, T; Araoka, D; Naraoka, H; Sakai, S; Ogawa, NO; Yurimoto, H; Morita, M; Onose, M; Yokoyama, T; Bizzarro, M; Tanaka, S; Ohkouchi, N; Koga, T; Dworkin, JP; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y; Tachibana, S; Takano, Y

NATURE COMMUNICATIONS Vol. 15 ( 1 ) 2024.9

Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu Reviewed International coauthorship International journal

Bradley De Gregorio, George D. Cody, Rhonda M. Stroud, A. L. David Kilcoyne, Scott Sandford, Corentin Le Guillou, Larry R. Nittler, Jens Barosch, Hikaru Yabuta, Zita Martins, Yoko Kebukawa, Taiga Okumura, Minako Hashiguchi, Shohei Yamashita, Yasuo Takeichi, Yoshio Takahashi, Daisuke Wakabayashi, Cécile Engrand, Laure Bejach, Lydie Bonal, Eric Quirico, Laurent Remusat, Jean Duprat, Maximilien Verdier-Paoletti, Smail Mostefaoui, Mutsumi Komatsu, Jérémie Mathurin, Alexandre Dazzi, Ariane Deniset-Besseau, Emmanuel Dartois, Yusuke Tamenori, Hiroki Suga, Gilles Montagnac, Kanami Kamide, Miho Shigenaka, Megumi Matsumoto, Yuma Enokido, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Usui, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

Nature Communications Vol. 15 ( 1 ) 2024.8

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended hydrothermal processing. Surface regolith collected by the Hayabusa2 spacecraft from the carbon-rich asteroid 162173 Ryugu present a unique opportunity to untangle the sources and processing history of carbonaceous matter. Here we show carbonaceous grains in Ryugu can be classified into three main populations defined by spectral shape: Highly aromatic (HA), Alkyl-Aromatic (AA), and IOM-like (IL). These carbon populations may be related to primordial chemistry, since C and N isotopic compositions vary between the three groups. Diffuse carbon is occasionally dominated by molecular carbonate preferentially associated with coarse-grained phyllosilicate minerals. Compared to related carbonaceous meteorites, the greater diversity of organic functional chemistry in Ryugu indicate the pristine condition of these asteroid samples.

DOI： 10.1038/s41467-024-51731-w

Other Link： https://www.nature.com/articles/s41467-024-51731-w

Asteroid Ryugu and the Hayabusa2 Mission Invited Reviewed International journal

Sei-ichiro Watanabe, Shota Kikuchi

Oxford Research Encyclopedia of Planetary Science 2024.8

Authorship：Lead author,　Corresponding author Language：English Publishing type：Part of collection (book) Publisher：Oxford University Press

The carbonaceous type (C-type) asteroid Ryugu is a near-Earth object measuring ~1 km in equatorial diameter. C-type asteroids of this size are seldom found in the near-Earth region, making Ryugu an invaluable target for a sample return mission. Studying Ryugu offers insights into the Solar System formation and the transportation of volatile components from the asteroid belt to the early Earth. The Hayabusa2 spacecraft, developed by the Japan Aerospace Explosion Agency (JAXA), was launched on an H-IIA rocket in December 2014. It reached Ryugu in June 2018, and for 17 months, it closely observed the asteroid using optical and thermal imagers, a near-infrared spectrometer, and a laser altimeter. The spacecraft deployed three small rovers and a lander onto Ryugu surface, allowing for in-depth imaging and measurements. Furthermore, Hayabusa2 executed two precise touchdowns on different regions of the asteroid for sampling and initiated an impact experiment that created an artificial crater on Ryugu. During the second touchdown, subsurface materials ejected from the artificial crater were collected. Hayabusa2 departed from Ryugu in November 2019 and returned a capsule containing Ryugu samples to Earth in December 2020. Having successfully completed its sample return mission, Hayabusa2 is now en route to its next objective: a rendezvous with a small, rapidly rotating asteroid in July 2031. Ryugu is a rubble-pile asteroid, formed through the re-accumulation of fragments of a disrupted parent asteroid in the inner main asteroid belt. Its distinct spinning-top shape was likely molded by landslides, triggered by rapid rotation about ten million years after its formation. Chemically, Ryugu’s surface material closely resembles that of CI (Ivuna-type) carbonaceous chondrites, known for their primitive compositions. The high porosity of Ryugu particles hints at a past presence of ice. Moreover, the plentiful carbonates, combined with the limited presence of high-temperature inclusions larger than 30 μm, suggest that Ryugu’s parent body originated in the outer Solar System, likely beyond the Saturn orbit. Within a few million years following the formation of the Solar System, gravitational interactions with giant planets may have scattered this parent body to the inner main asteroid belt. The decay heat from the short-lived radionuclide, 26Al, then facilitated aqueous alteration of the parent body and led to the genesis of diverse organic compounds. Many low-albedo asteroids in the main belt share spectra similarities with Ryugu. This implies that the structural water in phyllosilicates and organic matter could have been transported to the early Earth through dynamical and collisional evolution of these objects.

DOI： 10.1093/acrefore/9780190647926.013.266

Pyrrhotites in asteroid 162173 Ryugu: Records of the initial changes on their surfaces with aqueous alteration Reviewed International coauthorship International journal

Hiroharu Yui, Shu-hei Urashima, Morihiko Onose, Mayu Morita, Shintaro Komatani, Izumi Nakai, Yoshinari Abe, Yasuko Terada, Hisashi Homma, Kazuko Motomura, Kiyohiro Ichida, Tetsuya Yokoyama, Kazuhide Nagashima, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Peter Hoppe, Gary R. Huss, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Sasha Krot, Ming-Chang Liu, Yuki Masuda, Frédéric Moynier, Ann Nguyen, Larry Nittler, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Tommaso Di Rocco, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Geochimica et Cosmochimica Acta Vol. 379 page： 172 - 183 2024.8

Primordial aqueous alteration recorded in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu Reviewed International coauthorship International journal

Yoshinori Takano, Hiroshi Naraoka, Jason P. Dworkin, Toshiki Koga, Kazunori Sasaki, Hajime Sato, Yasuhiro Oba, Nanako O. Ogawa, Toshihiro Yoshimura, Kenji Hamase, Naohiko Ohkouchi, Eric T. Parker, José C. Aponte, Daniel P. Glavin, Yoshihiro Furukawa, Junken Aoki, Kuniyuki Kano, Shin-ichiro M. Nomura, Francois-Regis Orthous-Daunay, Philippe Schmitt-Kopplin, Aogu Furusho, Minako Hashiguchi, Kazuhiko Fukushima, Dan Aoki, Hannah L. McLain, Jamie E. Elsila, Heather V. Graham, John M. Eiler, Norbert Hertkorn, Alexander Ruf, Cédric Wolters, Junko Isa, Véronique Vuitton, Roland Thissen, Saburo Sakai, Haruna Sugahara, Hajime Mita, Yoshito Chikaraishi, Takaaki Yoshikawa, Satoru Tanaka, Mayu Morita, Morihiko Onose, Daisuke Araoka, Fumie Kabashima, Kosuke Fujishima, Hajime Sato, Tomoya Yamazaki, Yuki Kimura, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana

Nature Communications Vol. 15 ( 1 ) 2024.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

We report primordial aqueous alteration signatures in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 spacecraft of JAXA. Newly identified low-molecular-weight hydroxy acids (HO-R-COOH) and dicarboxylic acids (HOOC-R-COOH), such as glycolic acid, lactic acid, glyceric acid, oxalic acid, and succinic acid, are predominant in samples from the two touchdown locations at Ryugu. The quantitative and qualitative profiles for the hydrophilic molecules between the two sampling locations shows similar trends within the order of ppb (parts per billion) to ppm (parts per million). A wide variety of structural isomers, including α- and β-hydroxy acids, are observed among the hydrophilic molecules. We also identify pyruvic acid and dihydroxy and tricarboxylic acids, which are biochemically important intermediates relevant to molecular evolution, such as the primordial TCA (tricarboxylic acid) cycle. Here, we find evidence that the asteroid Ryugu samples underwent substantial aqueous alteration, as revealed by the presence of malonic acid during keto–enol tautomerism in the dicarboxylic acid profile. The comprehensive data suggest the presence of a series for water-soluble organic molecules in the regolith of Ryugu and evidence of signatures in coevolutionary aqueous alteration between water and organics in this carbonaceous asteroid.

DOI： 10.1038/s41467-024-49237-6

Web of Science

PubMed

Other Link： https://www.nature.com/articles/s41467-024-49237-6

Microscale hydrogen, carbon, and nitrogen isotopic diversity of organic matter in asteroid Ryugu Reviewed International coauthorship International journal

Larry R Nittler, Jens Barosch, Katherine Burgess, Rhonda M Stroud, Jianhua Wang, Hikaru Yabuta, Yuma Enokido, Megumi Matsumoto, Tomoki Nakamura, Yoko Kebukawa, Shohei Yamashita, Yoshio Takahashi, Laure Bejach, Lydie Bonal, George D Cody, Emmanuel Dartois, Alexandre Dazzi, Bradley De Gregorio, Ariane Deniset-Besseau, Jean Duprat, Cécile Engrand, Minako Hashiguchi, A.L. David Kilcoyne, Mutsumi Komatsu, Zita Martins, Jérémie Mathurin, Gilles Montagnac, Smail Mostefaoui, Taiga Okumura, Eric Quirico, Laurent Remusat, Scott Sandford, Miho Shigenaka, Hiroki Suga, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Daisuke Wakabayashi, Masanao Abe, Kanami Kamide, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Tomohiro Usui, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

Earth and Planetary Science Letters Vol. 637 page： 118719 - 118719 2024.7

Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body Reviewed International coauthorship International journal

Akira Tsuchiyama, Megumi Matsumoto, Junya Matsuno, Masahiro Yasutake, Tomoki Nakamura, Takaaki Noguchi, Akira Miyake, Kentaro Uesugi, Akihisa Takeuchi, Shota Okumura, Yuri Fujioka, Mingqi Sun, Aki Takigawa, Toru Matsumoto, Satomi Enju, Itaru Mitsukawa, Yuma Enokido, Tatsuhiko Kawamoto, Takeshi Mikouchi, Tatsuhiro Michikami, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Stefano Rubino, Zelia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Michael E. Zolensky, Tsukasa Nakano, Naoto Nakano, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

Geochimica et Cosmochimica Acta Vol. 375 page： 146 - 172 2024.6

Aqueous alteration in icy planetesimals: The effect of outward transport of gaseous hydrogen Reviewed International coauthorship International journal

Shibuya, T; Sekine, Y; Kikuchi, S; Kurokawa, H; Fukushi, K; Nakamura, T; Watanabe, S

GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 374 page： 264 - 283 2024.6

Nonmagnetic framboid and associated iron nanoparticles with a space-weathered feature from asteroid Ryugu Reviewed International coauthorship International journal

Yuki Kimura, Takeharu Kato, Satoshi Anada, Ryuji Yoshida, Kazuo Yamamoto, Toshiaki Tanigaki, Tetsuya Akashi, Hiroto Kasai, Kosuke Kurosawa, Tomoki Nakamura, Takaaki Noguchi, Masahiko Sato, Toru Matsumoto, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana

Nature Communications Vol. 15 ( 1 ) 2024.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

Extraterrestrial minerals on the surface of airless Solar System bodies undergo gradual alteration processes known as space weathering over long periods of time. The signatures of space weathering help us understand the phenomena occurring in the Solar System. However, meteorites rarely retain the signatures, making it impossible to study the space weathering processes precisely. Here, we examine samples retrieved from the asteroid Ryugu by the Hayabusa2 spacecraft and discover the presence of nonmagnetic framboids through electron holography measurements that can visualize magnetic flux. Magnetite particles, which normally provide a record of the nebular magnetic field, have lost their magnetic properties by reduction via a high-velocity (>5 km s–1) impact of a micrometeoroid with a diameter ranging from 2 to 20 μm after destruction of the parent body of Ryugu. Around these particles, thousands of metallic-iron nanoparticles with a vortex magnetic domain structure, which could have recorded a magnetic field in the impact event, are found. Through measuring the remanent magnetization of the iron nanoparticles, future studies are expected to elucidate the nature of the nebular/interplanetary magnetic fields after the termination of aqueous alteration in an asteroid.

DOI： 10.1038/s41467-024-47798-0

Web of Science

PubMed

Other Link： https://www.nature.com/articles/s41467-024-47798-0

AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission Reviewed International journal

Mathurin, J; Bejach, L; Dartois, E; Engrand, C; Dazzi, A; Deniset-Besseau, A; Duprat, J; Kebukawa, Y; Yabuta, H; Bonal, L; Quirico, E; Sandt, C; Borondics, F; Barosch, J; Beck, P; Cody, GD; De Gregorio, BT; Hashiguchi, M; Kilcoyne, DAL; Komatsu, M; Martins, Z; Matsumoto, M; Montagnac, G; Mostefaoui, S; Nittler, LR; Ohigashi, T; Okumura, T; Phan, VH; Remusat, L; Sandford, S; Shigenaka, M; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Yamashita, S; Nakamura, T; Morita, T; Kikuiri, M; Amano, K; Kagawa, E; Noguchi, T; Naraoka, H; Okazaki, R; Sakamoto, K; Yurimoto, H; Abe, M; Kamide, K; Miyazaki, A; Nakato, A; Nakazawa, S; Nishimura, M; Okada, T; Saiki, T; Tachibana, S; Tanaka, S; Terui, F; Tsuda, Y; Usui, T; Watanabe, SI; Yada, T; Yogata, K; Yoshikawa, M

ASTRONOMY & ASTROPHYSICS Vol. 684 2024.4

Correlated IR-SEM-TEM studies of three different grains from Ryugu: From the initial material to post-accretional processes Reviewed International coauthorship International journal

Alice Aléon-Toppani, Rosario Brunetto, Zélia Dionnet, Stefano Rubino, Donia Baklouti, François Brisset, Maxime Vallet, Eva Heripre, Tomoki Nakamura, Cateline Lantz, Zahia Djouadi, Ferenc Borondics, Christophe Sandt, David Troadec, Obadias Mivumbi, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohira Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Geochimica et Cosmochimica Acta Vol. 371 page： 1 - 30 2024.4

Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material Reviewed International coauthorship International journal

Ryoji Tanaka, Dilan M. Ratnayake, Tsutomu Ota, Noah Miklusicak, Tak Kunihiro, Christian Potiszil, Chie Sakaguchi, Katsura Kobayashi, Hiroshi Kitagawa, Masahiro Yamanaka, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

The Astrophysical Journal Vol. 965 ( 1 ) page： 52 - 52 2024.4

Language：English Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

The analysis of samples returned from the C-type asteroid Ryugu has drastically advanced our knowledge of the evolution of early solar system materials. However, no consensus has been obtained on the chronological data, which is important for understanding the evolution of the asteroid Ryugu. Here, the aqueous alteration age of Ryugu particles was determined by the Mn–Cr method using bulk samples, yielding an age of 4.13 + 0.62/−0.55 Myr after the formation of Ca–Al-rich inclusions (CAI). The age corresponds to 4563.17 + 0.60/−0.67 Myr ago. The higher 55Mn/52Cr, ε 54Cr, and initial ε 53Cr values of the Ryugu samples relative to any carbonaceous chondrite samples implies that its progenitor body formed from the least thermally processed precursors in the outermost region of the protoplanetary disk. Despite accreting at different distances from the Sun, the hydrous asteroids (Ryugu and the parent bodies of CI, CM, CR, and ungrouped C2 meteorites) underwent aqueous alteration during a period of limited duration (3.8 ± 1.8 Myr after CAI). These ages are identical to the crystallization age of the carbonaceous achondirtes NWA 6704/6693 within the error. The ε 54Cr and initial ε 53Cr values of Ryugu and NWA 6704/6693 are also identical, while they show distinct Δ'17O values. This suggests that the precursors that formed the progenitor bodies of Ryugu and NWA 6703/6693 were formed in close proximity and experienced a similar degree of thermal processing in the protosolar nebula. However, the progenitor body of Ryugu was formed by a higher ice/dust ratio, than NWA6703/6693, in the outer region of the protoplanetary disk.

DOI： 10.3847/1538-4357/ad276a

Web of Science

Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/ad276a/pdf

Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites Reviewed International coauthorship International journal

Yan Hu, Frédéric Moynier, Wei Dai, Marine Paquet, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. O'D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorný, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Icarus Vol. 409 page： 115884 - 115884 2024.2

Microstructural and chemical features of impact melts on Ryugu particle surfaces: Records of interplanetary dust hit on asteroid Ryugu Reviewed International coauthorship International journal

Megumi Matsumoto, Junya Matsuno, Akira Tsuchiyama, Tomoki Nakamura, Yuma Enokido, Mizuha Kikuiri, Aiko Nakato, Masahiro Yasutake, Kentaro Uesugi, Akihisa Takeuchi, Satomi Enju, Shota Okumura, Itaru Mitsukawa, Mingqi Sun, Akira Miyake, Mitsutaka Haruta, Yohei Igami, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Michael Zolensky, Toru Yada, Masahiro Nishimura, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Science Advances Vol. 10 ( 3 ) 2024.1

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science (AAAS)

The Hayabusa2 spacecraft delivered samples of the carbonaceous asteroid Ryugu to Earth. Some of the sample particles show evidence of micrometeoroid impacts, which occurred on the asteroid surface. Among those, particles A0067 and A0094 have flat surfaces on which a large number of microcraters and impact melt splashes are observed. Two impact melt splashes and one microcrater were analyzed to unveil the nature of the objects that impacted the asteroid surface. The melt splashes consist mainly of Mg-Fe–rich glassy silicates and Fe-Ni sulfides. The microcrater trapped an impact melt consisting mainly of Mg-Fe–rich glassy silicate, Fe-Ni sulfides, and minor silica-rich glass. These impact melts show a single compositional trend indicating mixing of Ryugu surface materials and impactors having chondritic chemical compositions. The relict impactor in one of the melt splashes shows mineralogical similarity with anhydrous chondritic interplanetary dust particles having a probable cometary origin. The chondritic micrometeoroids probably impacted the Ryugu surface during its residence in a near-Earth orbit.

DOI： 10.1126/sciadv.adi7203

The thermal history of Ryugu based on Raman characterization of Hayabusa2 samples Reviewed International coauthorship International journal

Bonal, L; Quirico, E; Montagnac, G; Komatsu, M; Kebukawa, Y; Yabuta, H; Amano, K; Barosch, J; Bejach, L; Cody, GD; Dartois, E; Dazzi, A; De Gregorio, B; Deniset-Besseau, A; Duprat, J; Engrand, C; Hashiguchi, M; Kamide, K; Kilcoyne, D; Martins, Z; Mathurin, J; Mostefaoui, S; Nittler, L; Ohigashi, T; Okumura, T; Remusat, L; Sandford, S; Shigenaka, M; Stroud, R; Suga, H; Takahashi, Y; Takeichi, Y; Tamenori, Y; Verdier-Paoletti, M; Yamashita, S; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Yurimoto, H; Tachibana, S; Abe, M; Miyazaki, A; Nakato, A; Nakazawa, S; Nishimura, M; Okada, T; Saiki, T; Sakamoto, K; Tanaka, S; Terui, F; Tsuda, Y; Usui, T; Watanabe, S; Yada, T; Yogata, K; Yoshikawa, M

ICARUS Vol. 408 2024.1

Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium Reviewed International coauthorship International journal

Zeichner, SS; Aponte, JC; Bhattacharjee, S; Dong, GN; Hofmann, AE; Dworkin, JP; Glavin, DP; Elsila, JE; Graham, HV; Naraoka, H; Takano, Y; Tachibana, S; Karp, AT; Grice, K; Holman, AI; Freeman, KH; Yurimoto, H; Nakamura, T; Noguchi, T; Okazaki, R; Yabuta, H; Sakamoto, K; Yada, T; Nishimura, M; Nakato, A; Miyazaki, A; Yogata, K; Abe, M; Okada, T; Usui, T; Yoshikawa, M; Saiki, T; Tanaka, S; Terui, F; Nakazawa, S; Watanabe, S; Tsuda, Y; Hamase, K; Fukushima, K; Aoki, D; Hashiguchi, M; Mita, H; Chikaraishi, Y; Ohkouchi, N; Ogawa, NO; Sakai, S; Parker, ET; McLain, HL; Orthous-Daunay, FR; Vuitton, V; Wolters, C; Schmitt-Kopplin, P; Hertkorn, N; Thissen, R; Ruf, A; Isa, J; Oba, Y; Koga, T; Yoshimura, T; Araoka, D; Sugahara, H; Furusho, A; Furukawa, Y; Aoki, J; Kano, K; Nomura, SM; Sasaki, K; Sato, H; Yoshikawa, T; Tanaka, S; Morita, M; Onose, M; Kabashima, F; Fujishima, K; Yamazaki, T; Kimura, Y; Eiler, JM

SCIENCE Vol. 382 ( 6677 ) page： 1411 - 1415 2023.12

Nucleosynthetic s-Process Depletion in Mo from Ryugu samples returned by Hayabusa2 Reviewed International coauthorship International journal

Nakanishi, N; Yokoyama, T; Ishikawa, A; Walker, RJ; Abe, Y; Aléon, J; Alexander, CMO; Amari, S; Amelin, Y; Bajo, KI; Bizzarro, M; Bouvier, A; Carlson, RW; Chaussidon, M; Choi, BG; Dauphas, N; Davis, AM; Di Rocco, T; Fujiya, W; Fukai, R; Gautam, I; Haba, MK; Hibiya, Y; Hidaka, H; Homma, H; Hoppe, P; Huss, GR; Ichida, K; Iizuka, T; Ireland, TR; Itoh, S; Kawasaki, N; Kita, NT; Kitajima, K; Kleine, T; Komatani, S; Krot, AN; Liu, MC; Masuda, Y; Morita, M; Motomura, K; Moynier, F; Nakai, I; Nagashima, K; Nguyen, A; Nittler, L; Onose, M; Pack, A; Park, C; Piani, L; Qin, L; Russell, SS; Sakamoto, N; Schönbächler, M; Tafla, L; Tang, H; Terada, K; Terada, Y; Usui, T; Wada, S; Wadhwa, M; Yamashita, K; Yin, QZ; Yoneda, S; Young, D; Yui, H; Zhang, AC; Nakamura, T; Naraoka, H; Noguchi, T; Okazaki, R; Sakamoto, K; Yabuta, H; Abe, M; Miyazaki, A; Nakato, A; Nishimura, M; Okada, T; Yada, T; Yogata, K; Nakazawa, S; Saiki, T; Tanaka, S; Terui, F; Tsuda, Y; Watanabe, SI; Yoshikawa, M; Tachibana, S; Yurimoto, H

GEOCHEMICAL PERSPECTIVES LETTERS Vol. 28 page： 31 - 36 2023.12

Reassigning CI chondrite parent bodies based on reflectance spectroscopy of samples from carbonaceous asteroid Ryugu and meteorites Reviewed International coauthorship International journal

Kana Amano, Moe Matsuoka, Tomoki Nakamura, Eiichi Kagawa, Yuri Fujioka, Sandra M. Potin, Takahiro Hiroi, Eri Tatsumi, Ralph E. Milliken, Eric Quirico, Pierre Beck, Rosario Brunetto, Masayuki Uesugi, Yoshio Takahashi, Takahiro Kawai, Shohei Yamashita, Yuma Enokido, Taiga Wada, Yoshihiro Furukawa, Michael E. Zolensky, Driss Takir, Deborah L. Domingue, Camilo Jaramillo-Correa, Faith Vilas, Amanda R. Hendrix, Mizuha Kikuiri, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Science Advances Vol. 9 ( 49 ) 2023.12

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science (AAAS)

The carbonaceous asteroid Ryugu has been explored by the Hayabusa2 spacecraft to elucidate the actual nature of hydrous asteroids. Laboratory analyses revealed that the samples from Ryugu are comparable to unheated CI carbonaceous chondrites; however, reflectance spectra of Ryugu samples and CIs do not coincide. Here, we demonstrate that Ryugu sample spectra are reproduced by heating Orgueil CI chondrite at 300°C under reducing conditions, which caused dehydration of terrestrial weathering products and reduction of iron in phyllosilicates. Terrestrial weathering of CIs accounts for the spectral differences between Ryugu sample and CIs, which is more severe than space weathering that likely explains those between asteroid Ryugu and the collected samples. Previous assignments of CI chondrite parent bodies, i.e., chemically most primitive objects in the solar system, are based on the spectra of CI chondrites. This study indicates that actual spectra of CI parent bodies are much darker and flatter at ultraviolet to visible wavelengths than the spectra of CI chondrites.

DOI： 10.1126/sciadv.adi3789

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