Spectrally blue hydrated parent body of asteroid (162173) Ryugu.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
05 Oct 2021
05 Oct 2021
Historique:
received:
14
04
2021
accepted:
10
09
2021
entrez:
6
10
2021
pubmed:
7
10
2021
medline:
7
10
2021
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 34611167
doi: 10.1038/s41467-021-26071-8
pii: 10.1038/s41467-021-26071-8
pmc: PMC8492871
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
5837Subventions
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : Core-to-Core program
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : Core-to-Core program "International Network of Planetary Sciences"
Informations de copyright
© 2021. The Author(s).
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