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Tatsumi E, Sakatani N, Riu L, Matsuoka M, Honda R, Morota T, Kameda S, Nakamura T, Zolensky M, Brunetto R, Hiroi T, Sasaki S, Watanabe S, Tanaka S, Takita J, Pilorget C, de León J, Popescu M, Rizos JL, Licandro J, Palomba E, Domingue D, Vilas F, Campins H, Cho Y, Yoshioka K, Sawada H, Yokota Y, Hayakawa M, Yamada M, Kouyama T, Suzuki H, Honda C, Ogawa K, Kitazato K, Hirata N, Hirata N, Tsuda Y, Yoshikawa M, Saiki T, Terui F, Nakazawa S, Takei Y, Takeuchi H, Yamamoto Y, Okada T, Shimaki Y, Shirai K, Sugita S. Spectrally blue hydrated parent body of asteroid (162173) Ryugu. Nat Commun 2021; 12:5837. [PMID: 34611167 PMCID: PMC8492871 DOI: 10.1038/s41467-021-26071-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 09/10/2021] [Indexed: 02/08/2023] Open
Abstract
Ryugu is a carbonaceous rubble-pile asteroid visited by the Hayabusa2 spacecraft. Small rubble pile asteroids record the thermal evolution of their much larger parent bodies. However, recent space weathering and/or solar heating create ambiguities between the uppermost layer observable by remote-sensing and the pristine material from the parent body. Hayabusa2 remote-sensing observations find that on the asteroid (162173) Ryugu both north and south pole regions preserve the material least processed by space weathering, which is spectrally blue carbonaceous chondritic material with a 0-3% deep 0.7-µm band absorption, indicative of Fe-bearing phyllosilicates. Here we report that spectrally blue Ryugu's parent body experienced intensive aqueous alteration and subsequent thermal metamorphism at 570-670 K (300-400 °C), suggesting that Ryugu's parent body was heated by radioactive decay of short-lived radionuclides possibly because of its early formation 2-2.5 Ma. The samples being brought to Earth by Hayabusa2 will give us our first insights into this epoch in solar system history.
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Affiliation(s)
- Eri Tatsumi
- grid.17423.330000 0004 1767 6621Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife Spain ,grid.10041.340000000121060879Department of Astrophysics, University of La Laguna, La Laguna, Tenerife Spain ,grid.26999.3d0000 0001 2151 536XThe University of Tokyo, Bunkyo, Tokyo Japan
| | - Naoya Sakatani
- grid.262564.10000 0001 1092 0677Rikkyo University, Toshima, Tokyo Japan
| | - Lucie Riu
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Moe Matsuoka
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Rie Honda
- grid.415887.70000 0004 1769 1768Kochi University, Kochi, Kochi, Japan
| | - Tomokatsu Morota
- grid.26999.3d0000 0001 2151 536XThe University of Tokyo, Bunkyo, Tokyo Japan
| | - Shingo Kameda
- grid.262564.10000 0001 1092 0677Rikkyo University, Toshima, Tokyo Japan
| | - Tomoki Nakamura
- grid.69566.3a0000 0001 2248 6943Tohoku University, Sendai, Miyagi Japan
| | - Michael Zolensky
- grid.419085.10000 0004 0613 2864NASA Johnson Space Center, Houston, TX USA
| | - Rosario Brunetto
- grid.4444.00000 0001 2112 9282Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale, Orsay, France
| | - Takahiro Hiroi
- grid.40263.330000 0004 1936 9094Brown University, Providence, RI USA
| | - Sho Sasaki
- grid.136593.b0000 0004 0373 3971Osaka University, Toyonaka, Osaka, Japan
| | | | - Satoshi Tanaka
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan ,grid.275033.00000 0004 1763 208XSOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa Japan
| | - Jun Takita
- grid.474810.eHokkaido Kitami Hokuto High School, Kitami, Hokkaido, Japan
| | - Cédric Pilorget
- grid.4444.00000 0001 2112 9282Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale, Orsay, France
| | - Julia de León
- grid.17423.330000 0004 1767 6621Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife Spain ,grid.10041.340000000121060879Department of Astrophysics, University of La Laguna, La Laguna, Tenerife Spain
| | - Marcel Popescu
- grid.418333.e0000 0004 1937 1389Astronomical Institute of the Romanian Academy, Bucharest, Romania
| | - Juan Luis Rizos
- grid.17423.330000 0004 1767 6621Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife Spain ,grid.10041.340000000121060879Department of Astrophysics, University of La Laguna, La Laguna, Tenerife Spain
| | - Javier Licandro
- grid.17423.330000 0004 1767 6621Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife Spain ,grid.10041.340000000121060879Department of Astrophysics, University of La Laguna, La Laguna, Tenerife Spain
| | - Ernesto Palomba
- NAF, Instituto di Astrofisica e Planetologia Spaziali, Rome, Italy
| | - Deborah Domingue
- grid.423138.f0000 0004 0637 3991Planetary Science Institute, Tucson, AZ USA
| | - Faith Vilas
- grid.423138.f0000 0004 0637 3991Planetary Science Institute, Tucson, AZ USA
| | - Humberto Campins
- grid.170430.10000 0001 2159 2859University of Central Florida, Orland, FL USA
| | - Yuichiro Cho
- grid.26999.3d0000 0001 2151 536XThe University of Tokyo, Bunkyo, Tokyo Japan
| | - Kazuo Yoshioka
- grid.26999.3d0000 0001 2151 536XThe University of Tokyo, Bunkyo, Tokyo Japan
| | - Hirotaka Sawada
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Yasuhiro Yokota
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Masahiko Hayakawa
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Manabu Yamada
- grid.254124.40000 0001 2294 246XPlanetary Exploration Research Center (PERC), Chiba Institute of Technology, Narashino, Chiba Japan
| | - Toru Kouyama
- grid.208504.b0000 0001 2230 7538National Institute of Advanced Industrial Science and Technology (AIST), Koto, Tokyo Japan
| | - Hidehiko Suzuki
- grid.411764.10000 0001 2106 7990Meiji University, Kawasaki, Kanagawa Japan
| | - Chikatoshi Honda
- grid.265880.10000 0004 1763 0236The University of Aizu, Aizu-Wakamatsu, Fukushima, Japan
| | - Kazunori Ogawa
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Kohei Kitazato
- grid.265880.10000 0004 1763 0236The University of Aizu, Aizu-Wakamatsu, Fukushima, Japan
| | - Naru Hirata
- grid.265880.10000 0004 1763 0236The University of Aizu, Aizu-Wakamatsu, Fukushima, Japan
| | - Naoyuki Hirata
- grid.31432.370000 0001 1092 3077Kobe University, Kobe, Hyogo, Japan
| | - Yuichi Tsuda
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan ,grid.275033.00000 0004 1763 208XSOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa Japan
| | - Makoto Yoshikawa
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan ,grid.275033.00000 0004 1763 208XSOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa Japan
| | - Takanao Saiki
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Fuyuto Terui
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Satoru Nakazawa
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Yuto Takei
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Hiroshi Takeuchi
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan ,grid.275033.00000 0004 1763 208XSOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa Japan
| | - Yukio Yamamoto
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan ,grid.275033.00000 0004 1763 208XSOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa Japan
| | - Tatsuaki Okada
- grid.26999.3d0000 0001 2151 536XThe University of Tokyo, Bunkyo, Tokyo Japan ,grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Yuri Shimaki
- grid.62167.340000 0001 2220 7916Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa Japan
| | - Kei Shirai
- grid.31432.370000 0001 1092 3077Kobe University, Kobe, Hyogo, Japan
| | - Seiji Sugita
- grid.26999.3d0000 0001 2151 536XThe University of Tokyo, Bunkyo, Tokyo Japan ,grid.254124.40000 0001 2294 246XPlanetary Exploration Research Center (PERC), Chiba Institute of Technology, Narashino, Chiba Japan
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