Spectrally blue hydrated parent body of asteroid (162173) Ryugu

Eri Tatsumi (), Naoya Sakatani, Lucie Riu, Moe Matsuoka, Rie Honda, Tomokatsu Morota, Shingo Kameda, Tomoki Nakamura, Michael Zolensky, Rosario Brunetto, Takahiro Hiroi, Sho Sasaki, Sei’ichiro Watanabe, Satoshi Tanaka, Jun Takita, Cédric Pilorget, Julia León, Marcel Popescu, Juan Luis Rizos, Javier Licandro, Ernesto Palomba, Deborah Domingue, Faith Vilas, Humberto Campins, Yuichiro Cho, Kazuo Yoshioka, Hirotaka Sawada, Yasuhiro Yokota, Masahiko Hayakawa, Manabu Yamada, Toru Kouyama, Hidehiko Suzuki, Chikatoshi Honda, Kazunori Ogawa, Kohei Kitazato, Naru Hirata, Naoyuki Hirata, Yuichi Tsuda, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Yuto Takei, Hiroshi Takeuchi, Yukio Yamamoto, Tatsuaki Okada, Yuri Shimaki, Kei Shirai and Seiji Sugita
Additional contact information
Eri Tatsumi: Instituto de Astrofísica de Canarias (IAC)
Naoya Sakatani: Rikkyo University
Lucie Riu: Japan Aerospace Exploration Agency (JAXA)
Moe Matsuoka: Japan Aerospace Exploration Agency (JAXA)
Rie Honda: Kochi University, Kochi
Tomokatsu Morota: The University of Tokyo
Shingo Kameda: Rikkyo University
Tomoki Nakamura: Tohoku University
Michael Zolensky: NASA Johnson Space Center
Rosario Brunetto: Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale
Takahiro Hiroi: Brown University
Sho Sasaki: Osaka University, Toyonaka
Sei’ichiro Watanabe: Nagoya University
Satoshi Tanaka: Japan Aerospace Exploration Agency (JAXA)
Jun Takita: Hokkaido Kitami Hokuto High School, Kitami
Cédric Pilorget: Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale
Julia León: Instituto de Astrofísica de Canarias (IAC)
Marcel Popescu: Astronomical Institute of the Romanian Academy
Juan Luis Rizos: Instituto de Astrofísica de Canarias (IAC)
Javier Licandro: Instituto de Astrofísica de Canarias (IAC)
Ernesto Palomba: NAF, Instituto di Astrofisica e Planetologia Spaziali
Deborah Domingue: Planetary Science Institute
Faith Vilas: Planetary Science Institute
Humberto Campins: University of Central Florida
Yuichiro Cho: The University of Tokyo
Kazuo Yoshioka: The University of Tokyo
Hirotaka Sawada: Japan Aerospace Exploration Agency (JAXA)
Yasuhiro Yokota: Japan Aerospace Exploration Agency (JAXA)
Masahiko Hayakawa: Japan Aerospace Exploration Agency (JAXA)
Manabu Yamada: Chiba Institute of Technology
Toru Kouyama: National Institute of Advanced Industrial Science and Technology (AIST)
Hidehiko Suzuki: Meiji University
Chikatoshi Honda: The University of Aizu, Aizu-Wakamatsu
Kazunori Ogawa: Japan Aerospace Exploration Agency (JAXA)
Kohei Kitazato: The University of Aizu, Aizu-Wakamatsu
Naru Hirata: The University of Aizu, Aizu-Wakamatsu
Naoyuki Hirata: Kobe University, Kobe
Yuichi Tsuda: Japan Aerospace Exploration Agency (JAXA)
Makoto Yoshikawa: Japan Aerospace Exploration Agency (JAXA)
Takanao Saiki: Japan Aerospace Exploration Agency (JAXA)
Fuyuto Terui: Japan Aerospace Exploration Agency (JAXA)
Satoru Nakazawa: Japan Aerospace Exploration Agency (JAXA)
Yuto Takei: Japan Aerospace Exploration Agency (JAXA)
Hiroshi Takeuchi: Japan Aerospace Exploration Agency (JAXA)
Yukio Yamamoto: Japan Aerospace Exploration Agency (JAXA)
Tatsuaki Okada: The University of Tokyo
Yuri Shimaki: Japan Aerospace Exploration Agency (JAXA)
Kei Shirai: Kobe University, Kobe
Seiji Sugita: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-26071-8

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