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Article Dans Une Revue Nature Communications Année : 2023

Soluble organic matter Molecular atlas of Ryugu reveals cold hydrothermalism on C-type asteroid parent body

Jason Dworkin
Hiroshi Naraoka
Takaaki Noguchi
Ryuji Okazaki
  • Fonction : Auteur
Hikaru Yabuta
Hisayoshi Yurimoto
Toru Yada
Sei-Ichiro Watanabe
Kenji Hamase
  • Fonction : Auteur
Aogu Furusho
  • Fonction : Auteur
Dan Aoki
  • Fonction : Auteur
Roland Thissen

Résumé

Abstract The sample from the near-Earth carbonaceous asteroid (162173) Ryugu is analyzed in the context of carbonaceous meteorites soluble organic matter. The analysis of soluble molecules of samples collected by the Hayabusa2 spacecraft shines light on an extremely high molecular diversity on the C-type asteroid. Sequential solvent extracts of increasing polarity of Ryugu samples are analyzed using mass spectrometry with complementary ionization methods and structural information confirmed by nuclear magnetic resonance spectroscopy. Here we show a continuum in the molecular size and polarity, and no organomagnesium molecules are detected, reflecting a low temperature and water-rich environment on the parent body approving earlier mineralogical and chemical data. High abundance of sulfidic and nitrogen rich compounds as well as high abundance of ammonium ions confirm the water processing. Polycyclic aromatic hydrocarbons are also detected in a structural continuum of carbon saturations and oxidations, implying multiple origins of the observed organic complexity, thus involving generic processes such as earlier carbonization and serpentinization with successive low temperature aqueous alteration.
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hal-04420427 , version 1 (30-01-2024)

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Philippe Schmitt-Kopplin, Norbert Hertkorn, Mourad Harir, Franco Moritz, Marianna Lucio, et al.. Soluble organic matter Molecular atlas of Ryugu reveals cold hydrothermalism on C-type asteroid parent body. Nature Communications, 2023, 14 (1), pp.6525. ⟨10.1038/s41467-023-42075-y⟩. ⟨hal-04420427⟩
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