A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

Takaaki Noguchi; Toru Matsumoto; Akira Miyake; Yohei Igami; Mitsutaka Haruta; Hikaru Saito; Satoshi Hata; Yusuke Seto; Masaaki Miyahara; Naotaka Tomioka; Hope A. Ishii; John P. Bradley; Kenta K. Ohtaki; Elena Dobrică; Hugues Leroux; Corentin Le Guillou; Damien Jacob; Francisco de la Peña; Sylvain Laforet; Maya Marinova; Falko Langenhorst; Dennis Harries; Pierre Beck; Thi H.V. Phan; Rolando Rebois; Neyda M. Abreu; Jennifer Gray; Thomas Zega; Pierre M. Zanetta; Michelle S. Thompson; Rhonda Stroud; Kate Burgess; Brittany A. Cymes; John C. Bridges; Leon Hicks; Martin R. Lee; Luke Daly; Phil A. Bland; Michael E. Zolensky; David R. Frank; James Martinez; Akira Tsuchiyama; Masahiro Yasutake; Junya Matsuno; Shota Okumura; Itaru Mitsukawa; Kentaro Uesugi; Masayuki Uesugi; Akihisa Takeuchi; Mingqi Sun; Satomi Enju; Aki Takigawa; Tatsuhiro Michikami; Tomoki Nakamura; Megumi Matsumoto; Yusuke Nakauchi; Masanao Abe; Masahiko Arakawa; Atsushi Fujii; Masahiko Hayakawa; Naru Hirata; Naoyuki Hirata; Rie Honda; Chikatoshi Honda; Satoshi Hosoda; Yu ichi Iijima; Hitoshi Ikeda; Masateru Ishiguro; Yoshiaki Ishihara; Takahiro Iwata; Kousuke Kawahara; Shota Kikuchi; Kohei Kitazato; Koji Matsumoto; Moe Matsuoka; Yuya Mimasu; Akira Miura; Tomokatsu Morota; Satoru Nakazawa; Noriyuki Namiki; Hirotomo Noda; Rina Noguchi; Naoko Ogawa; Kazunori Ogawa; Tatsuaki Okada; Chisato Okamoto; Go Ono; Masanobu Ozaki; Takanao Saiki; Naoya Sakatani; Hirotaka Sawada; Hiroki Senshu; Yuri Shimaki; Kei Shirai; Seiji Sugita; Yuto Takei; Hiroshi Takeuchi; Satoshi Tanaka; Eri Tatsumi; Fuyuto Terui; Ryudo Tsukizaki; Koji Wada; Manabu Yamada; Tetsuya Yamada; Yukio Yamamoto; Hajime Yano; Yasuhiro Yokota; Keisuke Yoshihara; Makoto Yoshikawa; Kent Yoshikawa; Ryohta Fukai; Shizuho Furuya; Kentaro Hatakeda; Tasuku Hayashi; Yuya Hitomi; Kazuya Kumagai; Akiko Miyazaki; Aiko Nakato; Masahiro Nishimura; Hiromichi Soejima; Ayako I. Suzuki; Tomohiro Usui; Toru Yada; Daiki Yamamoto; Kasumi Yogata; Miwa Yoshitake; Harold C. Connolly; Dante S. Lauretta; Hisayoshi Yurimoto; Kazuhide Nagashima; Noriyuki Kawasaki; Naoya Sakamoto; Ryuji Okazaki; Hikaru Yabuta; Hiroshi Naraoka; Kanako Sakamoto; Shogo Tachibana; Sei ichiro Watanabe; Yuichi Tsuda

doi:10.1038/s41550-022-01841-6

A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya MarinovaFalko Langenhorst, Dennis Harries, Pierre Beck, Thi H.V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naru Hirata, Naoyuki Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kousuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Ryudo Tsukizaki, Koji Wada, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Ryohta Fukai, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako I. Suzuki, Tomohiro Usui, Toru Yada, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Harold C. Connolly, Dante S. Lauretta, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei ichiro Watanabe, Yuichi Tsuda

Penn State DuBois

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe³⁺ to Fe²⁺ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.

Original language	English (US)
Pages (from-to)	170-181
Number of pages	12
Journal	Nature Astronomy
Volume	7
Issue number	2
DOIs	https://doi.org/10.1038/s41550-022-01841-6
State	Published - Feb 2023

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics

Access to Document

10.1038/s41550-022-01841-6

Cite this

Noguchi, T., Matsumoto, T., Miyake, A., Igami, Y., Haruta, M., Saito, H., Hata, S., Seto, Y., Miyahara, M., Tomioka, N., Ishii, H. A., Bradley, J. P., Ohtaki, K. K., Dobrică, E., Leroux, H., Le Guillou, C., Jacob, D., de la Peña, F., Laforet, S., ... Tsuda, Y. (2023). A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu. Nature Astronomy, 7(2), 170-181. https://doi.org/10.1038/s41550-022-01841-6

@article{9eefe06d2ac249fb918f0c53b61dc4d6,

title = "A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu",

abstract = "Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe3+ to Fe2+ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.",

author = "Takaaki Noguchi and Toru Matsumoto and Akira Miyake and Yohei Igami and Mitsutaka Haruta and Hikaru Saito and Satoshi Hata and Yusuke Seto and Masaaki Miyahara and Naotaka Tomioka and Ishii, {Hope A.} and Bradley, {John P.} and Ohtaki, {Kenta K.} and Elena Dobric{\u a} and Hugues Leroux and {Le Guillou}, Corentin and Damien Jacob and {de la Pe{\~n}a}, Francisco and Sylvain Laforet and Maya Marinova and Falko Langenhorst and Dennis Harries and Pierre Beck and Phan, {Thi H.V.} and Rolando Rebois and Abreu, {Neyda M.} and Jennifer Gray and Thomas Zega and Zanetta, {Pierre M.} and Thompson, {Michelle S.} and Rhonda Stroud and Kate Burgess and Cymes, {Brittany A.} and Bridges, {John C.} and Leon Hicks and Lee, {Martin R.} and Luke Daly and Bland, {Phil A.} and Zolensky, {Michael E.} and Frank, {David R.} and James Martinez and Akira Tsuchiyama and Masahiro Yasutake and Junya Matsuno and Shota Okumura and Itaru Mitsukawa and Kentaro Uesugi and Masayuki Uesugi and Akihisa Takeuchi and Mingqi Sun and Satomi Enju and Aki Takigawa and Tatsuhiro Michikami and Tomoki Nakamura and Megumi Matsumoto and Yusuke Nakauchi and Masanao Abe and Masahiko Arakawa and Atsushi Fujii and Masahiko Hayakawa and Naru Hirata and Naoyuki Hirata and Rie Honda and Chikatoshi Honda and Satoshi Hosoda and Iijima, {Yu ichi} and Hitoshi Ikeda and Masateru Ishiguro and Yoshiaki Ishihara and Takahiro Iwata and Kousuke Kawahara and Shota Kikuchi and Kohei Kitazato and Koji Matsumoto and Moe Matsuoka and Yuya Mimasu and Akira Miura and Tomokatsu Morota and Satoru Nakazawa and Noriyuki Namiki and Hirotomo Noda and Rina Noguchi and Naoko Ogawa and Kazunori Ogawa and Tatsuaki Okada and Chisato Okamoto and Go Ono and Masanobu Ozaki and Takanao Saiki and Naoya Sakatani and Hirotaka Sawada and Hiroki Senshu and Yuri Shimaki and Kei Shirai and Seiji Sugita and Yuto Takei and Hiroshi Takeuchi and Satoshi Tanaka and Eri Tatsumi and Fuyuto Terui and Ryudo Tsukizaki and Koji Wada and Manabu Yamada and Tetsuya Yamada and Yukio Yamamoto and Hajime Yano and Yasuhiro Yokota and Keisuke Yoshihara and Makoto Yoshikawa and Kent Yoshikawa and Ryohta Fukai and Shizuho Furuya and Kentaro Hatakeda and Tasuku Hayashi and Yuya Hitomi and Kazuya Kumagai and Akiko Miyazaki and Aiko Nakato and Masahiro Nishimura and Hiromichi Soejima and Suzuki, {Ayako I.} and Tomohiro Usui and Toru Yada and Daiki Yamamoto and Kasumi Yogata and Miwa Yoshitake and Connolly, {Harold C.} and Lauretta, {Dante S.} and Hisayoshi Yurimoto and Kazuhide Nagashima and Noriyuki Kawasaki and Naoya Sakamoto and Ryuji Okazaki and Hikaru Yabuta and Hiroshi Naraoka and Kanako Sakamoto and Shogo Tachibana and Watanabe, {Sei ichiro} and Yuichi Tsuda",

note = "Funding Information: The Hayabusa2 project has been developed and led by JAXA in collaboration with the Deutsches Zentrum f{\"u}r Luft- und Raumfahrt (DLR) and the Centre national d{\textquoteright}{\'e}tudes spatiales (CNES), and supported by NASA and the Australian Space Agency (ASA). We thank all of the members of the Hayabusa2 project for their technical and scientific contributions. TEM works at Kyushu University were supported by the Advanced Characterization Platform of the Nanotechnology Platform Japan (grant no. JPMXP09A21KU0393) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. P.B., T.H.V.P. and R.R. acknowledge the Centre National d{\textquoteright}Etude Spatiale (CNES). H.L., C.L.G., D.J., F.D.L.P. and M. Marinova acknowledge the advanced characterization platform, University of Lille - CNRS. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract no. DE-AC02–05CH11231. This work was funded by the following funds: JSPS KAKENHI grant nos. 19H00725, 19KK0094, 21H05424, 20H01965, 20H00198, 20H00205, 16H06348 and 20H00188; JSPS Core-to-core program {\textquoteleft}International Network of Planetary Sciences{\textquoteright}; UK Science and Technology Facilities Council (STFC) grant no. ST/S000429/1; Start-up funds from Purdue University; ISITE ULNE, M{\'e}tropole Europ{\'e}enne de Lille, the region {\textquoteleft}Hauts-de-France{\textquoteright} and the ERDF program of the European Union; and European Research Council (ERC) under grant agreement no. 771691 (Solarys). Funding Information: The Hayabusa2 project has been developed and led by JAXA in collaboration with the Deutsches Zentrum f{\"u}r Luft- und Raumfahrt (DLR) and the Centre national d{\textquoteright}{\'e}tudes spatiales (CNES), and supported by NASA and the Australian Space Agency (ASA). We thank all of the members of the Hayabusa2 project for their technical and scientific contributions. TEM works at Kyushu University were supported by the Advanced Characterization Platform of the Nanotechnology Platform Japan (grant no. JPMXP09A21KU0393) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. P.B., T.H.V.P. and R.R. acknowledge the Centre National d{\textquoteright}Etude Spatiale (CNES). H.L., C.L.G., D.J., F.D.L.P. and M. Marinova acknowledge the advanced characterization platform, University of Lille - CNRS. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract no. DE-AC02–05CH11231. This work was funded by the following funds: JSPS KAKENHI grant nos. 19H00725, 19KK0094, 21H05424, 20H01965, 20H00198, 20H00205, 16H06348 and 20H00188; JSPS Core-to-core program {\textquoteleft}International Network of Planetary Sciences{\textquoteright}; UK Science and Technology Facilities Council (STFC) grant no. ST/S000429/1; Start-up funds from Purdue University; ISITE ULNE, M{\'e}tropole Europ{\'e}enne de Lille, the region {\textquoteleft}Hauts-de-France{\textquoteright} and the ERDF program of the European Union; and European Research Council (ERC) under grant agreement no. 771691 (Solarys). Publisher Copyright: {\textcopyright} 2022, The Author(s).",

year = "2023",

month = feb,

doi = "10.1038/s41550-022-01841-6",

language = "English (US)",

volume = "7",

pages = "170--181",

journal = "Nature Astronomy",

issn = "2397-3366",

publisher = "Nature Publishing Group",

number = "2",

}

Noguchi, T, Matsumoto, T, Miyake, A, Igami, Y, Haruta, M, Saito, H, Hata, S, Seto, Y, Miyahara, M, Tomioka, N, Ishii, HA, Bradley, JP, Ohtaki, KK, Dobrică, E, Leroux, H, Le Guillou, C, Jacob, D, de la Peña, F, Laforet, S, Marinova, M, Langenhorst, F, Harries, D, Beck, P, Phan, THV, Rebois, R, Abreu, NM, Gray, J, Zega, T, Zanetta, PM, Thompson, MS, Stroud, R, Burgess, K, Cymes, BA, Bridges, JC, Hicks, L, Lee, MR, Daly, L, Bland, PA, Zolensky, ME, Frank, DR, Martinez, J, Tsuchiyama, A, Yasutake, M, Matsuno, J, Okumura, S, Mitsukawa, I, Uesugi, K, Uesugi, M, Takeuchi, A, Sun, M, Enju, S, Takigawa, A, Michikami, T, Nakamura, T, Matsumoto, M, Nakauchi, Y, Abe, M, Arakawa, M, Fujii, A, Hayakawa, M, Hirata, N, Hirata, N, Honda, R, Honda, C, Hosoda, S, Iijima, YI, Ikeda, H, Ishiguro, M, Ishihara, Y, Iwata, T, Kawahara, K, Kikuchi, S, Kitazato, K, Matsumoto, K, Matsuoka, M, Mimasu, Y, Miura, A, Morota, T, Nakazawa, S, Namiki, N, Noda, H, Noguchi, R, Ogawa, N, Ogawa, K, Okada, T, Okamoto, C, Ono, G, Ozaki, M, Saiki, T, Sakatani, N, Sawada, H, Senshu, H, Shimaki, Y, Shirai, K, Sugita, S, Takei, Y, Takeuchi, H, Tanaka, S, Tatsumi, E, Terui, F, Tsukizaki, R, Wada, K, Yamada, M, Yamada, T, Yamamoto, Y, Yano, H, Yokota, Y, Yoshihara, K, Yoshikawa, M, Yoshikawa, K, Fukai, R, Furuya, S, Hatakeda, K, Hayashi, T, Hitomi, Y, Kumagai, K, Miyazaki, A, Nakato, A, Nishimura, M, Soejima, H, Suzuki, AI, Usui, T, Yada, T, Yamamoto, D, Yogata, K, Yoshitake, M, Connolly, HC, Lauretta, DS, Yurimoto, H, Nagashima, K, Kawasaki, N, Sakamoto, N, Okazaki, R, Yabuta, H, Naraoka, H, Sakamoto, K, Tachibana, S, Watanabe, SI & Tsuda, Y 2023, 'A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu', Nature Astronomy, vol. 7, no. 2, pp. 170-181. https://doi.org/10.1038/s41550-022-01841-6

TY - JOUR

T1 - A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

AU - Noguchi, Takaaki

AU - Matsumoto, Toru

AU - Miyake, Akira

AU - Igami, Yohei

AU - Haruta, Mitsutaka

AU - Saito, Hikaru

AU - Hata, Satoshi

AU - Seto, Yusuke

AU - Miyahara, Masaaki

AU - Tomioka, Naotaka

AU - Ishii, Hope A.

AU - Bradley, John P.

AU - Ohtaki, Kenta K.

AU - Dobrică, Elena

AU - Leroux, Hugues

AU - Le Guillou, Corentin

AU - Jacob, Damien

AU - de la Peña, Francisco

AU - Laforet, Sylvain

AU - Marinova, Maya

AU - Langenhorst, Falko

AU - Harries, Dennis

AU - Beck, Pierre

AU - Phan, Thi H.V.

AU - Rebois, Rolando

AU - Abreu, Neyda M.

AU - Gray, Jennifer

AU - Zega, Thomas

AU - Zanetta, Pierre M.

AU - Thompson, Michelle S.

AU - Stroud, Rhonda

AU - Burgess, Kate

AU - Cymes, Brittany A.

AU - Bridges, John C.

AU - Hicks, Leon

AU - Lee, Martin R.

AU - Daly, Luke

AU - Bland, Phil A.

AU - Zolensky, Michael E.

AU - Frank, David R.

AU - Martinez, James

AU - Tsuchiyama, Akira

AU - Yasutake, Masahiro

AU - Matsuno, Junya

AU - Okumura, Shota

AU - Mitsukawa, Itaru

AU - Uesugi, Kentaro

AU - Uesugi, Masayuki

AU - Takeuchi, Akihisa

AU - Sun, Mingqi

AU - Enju, Satomi

AU - Takigawa, Aki

AU - Michikami, Tatsuhiro

AU - Nakamura, Tomoki

AU - Matsumoto, Megumi

AU - Nakauchi, Yusuke

AU - Abe, Masanao

AU - Arakawa, Masahiko

AU - Fujii, Atsushi

AU - Hayakawa, Masahiko

AU - Hirata, Naru

AU - Hirata, Naoyuki

AU - Honda, Rie

AU - Honda, Chikatoshi

AU - Hosoda, Satoshi

AU - Iijima, Yu ichi

AU - Ikeda, Hitoshi

AU - Ishiguro, Masateru

AU - Ishihara, Yoshiaki

AU - Iwata, Takahiro

AU - Kawahara, Kousuke

AU - Kikuchi, Shota

AU - Kitazato, Kohei

AU - Matsumoto, Koji

AU - Matsuoka, Moe

AU - Mimasu, Yuya

AU - Miura, Akira

AU - Morota, Tomokatsu

AU - Nakazawa, Satoru

AU - Namiki, Noriyuki

AU - Noda, Hirotomo

AU - Noguchi, Rina

AU - Ogawa, Naoko

AU - Ogawa, Kazunori

AU - Okada, Tatsuaki

AU - Okamoto, Chisato

AU - Ono, Go

AU - Ozaki, Masanobu

AU - Saiki, Takanao

AU - Sakatani, Naoya

AU - Sawada, Hirotaka

AU - Senshu, Hiroki

AU - Shimaki, Yuri

AU - Shirai, Kei

AU - Sugita, Seiji

AU - Takei, Yuto

AU - Takeuchi, Hiroshi

AU - Tanaka, Satoshi

AU - Tatsumi, Eri

AU - Terui, Fuyuto

AU - Tsukizaki, Ryudo

AU - Wada, Koji

AU - Yamada, Manabu

AU - Yamada, Tetsuya

AU - Yamamoto, Yukio

AU - Yano, Hajime

AU - Yokota, Yasuhiro

AU - Yoshihara, Keisuke

AU - Yoshikawa, Makoto

AU - Yoshikawa, Kent

AU - Fukai, Ryohta

AU - Furuya, Shizuho

AU - Hatakeda, Kentaro

AU - Hayashi, Tasuku

AU - Hitomi, Yuya

AU - Kumagai, Kazuya

AU - Miyazaki, Akiko

AU - Nakato, Aiko

AU - Nishimura, Masahiro

AU - Soejima, Hiromichi

AU - Suzuki, Ayako I.

AU - Usui, Tomohiro

AU - Yada, Toru

AU - Yamamoto, Daiki

AU - Yogata, Kasumi

AU - Yoshitake, Miwa

AU - Connolly, Harold C.

AU - Lauretta, Dante S.

AU - Yurimoto, Hisayoshi

AU - Nagashima, Kazuhide

AU - Kawasaki, Noriyuki

AU - Sakamoto, Naoya

AU - Okazaki, Ryuji

AU - Yabuta, Hikaru

AU - Naraoka, Hiroshi

AU - Sakamoto, Kanako

AU - Tachibana, Shogo

AU - Watanabe, Sei ichiro

AU - Tsuda, Yuichi

N1 - Funding Information: The Hayabusa2 project has been developed and led by JAXA in collaboration with the Deutsches Zentrum für Luft- und Raumfahrt (DLR) and the Centre national d’études spatiales (CNES), and supported by NASA and the Australian Space Agency (ASA). We thank all of the members of the Hayabusa2 project for their technical and scientific contributions. TEM works at Kyushu University were supported by the Advanced Characterization Platform of the Nanotechnology Platform Japan (grant no. JPMXP09A21KU0393) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. P.B., T.H.V.P. and R.R. acknowledge the Centre National d’Etude Spatiale (CNES). H.L., C.L.G., D.J., F.D.L.P. and M. Marinova acknowledge the advanced characterization platform, University of Lille - CNRS. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract no. DE-AC02–05CH11231. This work was funded by the following funds: JSPS KAKENHI grant nos. 19H00725, 19KK0094, 21H05424, 20H01965, 20H00198, 20H00205, 16H06348 and 20H00188; JSPS Core-to-core program ‘International Network of Planetary Sciences’; UK Science and Technology Facilities Council (STFC) grant no. ST/S000429/1; Start-up funds from Purdue University; ISITE ULNE, Métropole Européenne de Lille, the region ‘Hauts-de-France’ and the ERDF program of the European Union; and European Research Council (ERC) under grant agreement no. 771691 (Solarys). Funding Information: The Hayabusa2 project has been developed and led by JAXA in collaboration with the Deutsches Zentrum für Luft- und Raumfahrt (DLR) and the Centre national d’études spatiales (CNES), and supported by NASA and the Australian Space Agency (ASA). We thank all of the members of the Hayabusa2 project for their technical and scientific contributions. TEM works at Kyushu University were supported by the Advanced Characterization Platform of the Nanotechnology Platform Japan (grant no. JPMXP09A21KU0393) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. P.B., T.H.V.P. and R.R. acknowledge the Centre National d’Etude Spatiale (CNES). H.L., C.L.G., D.J., F.D.L.P. and M. Marinova acknowledge the advanced characterization platform, University of Lille - CNRS. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract no. DE-AC02–05CH11231. This work was funded by the following funds: JSPS KAKENHI grant nos. 19H00725, 19KK0094, 21H05424, 20H01965, 20H00198, 20H00205, 16H06348 and 20H00188; JSPS Core-to-core program ‘International Network of Planetary Sciences’; UK Science and Technology Facilities Council (STFC) grant no. ST/S000429/1; Start-up funds from Purdue University; ISITE ULNE, Métropole Européenne de Lille, the region ‘Hauts-de-France’ and the ERDF program of the European Union; and European Research Council (ERC) under grant agreement no. 771691 (Solarys). Publisher Copyright: © 2022, The Author(s).

PY - 2023/2

Y1 - 2023/2

N2 - Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe3+ to Fe2+ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.

AB - Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe3+ to Fe2+ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.

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U2 - 10.1038/s41550-022-01841-6

DO - 10.1038/s41550-022-01841-6

M3 - Article

C2 - 36845884

AN - SCOPUS:85138230361

SN - 2397-3366

VL - 7

SP - 170

EP - 181

JO - Nature Astronomy

JF - Nature Astronomy

IS - 2

ER -

A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

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