Spectrally blue hydrated parent body of asteroid (162173) Ryugu
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Published:2021-10-05
Issue:1
Volume:12
Page:
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ISSN:2041-1723
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Container-title:Nature Communications
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language:en
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Short-container-title:Nat Commun
Author:
Tatsumi EriORCID, Sakatani NaoyaORCID, Riu LucieORCID, Matsuoka MoeORCID, Honda Rie, Morota TomokatsuORCID, Kameda ShingoORCID, Nakamura Tomoki, Zolensky Michael, Brunetto RosarioORCID, Hiroi TakahiroORCID, Sasaki Sho, Watanabe Sei’ichiroORCID, Tanaka Satoshi, Takita Jun, Pilorget Cédric, de León JuliaORCID, Popescu Marcel, Rizos Juan LuisORCID, Licandro Javier, Palomba Ernesto, Domingue Deborah, Vilas Faith, Campins Humberto, Cho YuichiroORCID, Yoshioka KazuoORCID, Sawada Hirotaka, Yokota Yasuhiro, Hayakawa Masahiko, Yamada ManabuORCID, Kouyama ToruORCID, Suzuki Hidehiko, Honda Chikatoshi, Ogawa KazunoriORCID, Kitazato KoheiORCID, Hirata NaruORCID, Hirata Naoyuki, Tsuda Yuichi, Yoshikawa Makoto, Saiki Takanao, Terui Fuyuto, Nakazawa SatoruORCID, Takei YutoORCID, Takeuchi HiroshiORCID, Yamamoto YukioORCID, Okada TatsuakiORCID, Shimaki YuriORCID, Shirai Kei, Sugita SeijiORCID
Abstract
AbstractRyugu 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.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
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