Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu - Université de Lille
Article Dans Une Revue Nature Communications Année : 2024

Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu

Shohei Yamashita
  • Fonction : Auteur
KEK
Yasuo Takeichi
  • Fonction : Auteur
KEK
Daisuke Wakabayashi
  • Fonction : Auteur
KEK
Jérémie Mathurin
Alexandre Dazzi
Ariane Deniset-Besseau

Résumé

Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended hydrothermal processing. Surface regolith collected by the Hayabusa2 spacecraft from the carbon-rich asteroid 162173 Ryugu present a unique opportunity to untangle the sources and processing history of carbonaceous matter. Here we show carbonaceous grains in Ryugu can be classified into three main populations defined by spectral shape: Highly aromatic (HA), Alkyl-Aromatic (AA), and IOM-like (IL). These carbon populations may be related to primordial chemistry, since C and N isotopic compositions vary between the three groups. Diffuse carbon is occasionally dominated by molecular carbonate preferentially associated with coarse-grained phyllosilicate minerals. Compared to related carbonaceous meteorites, the greater diversity of organic functional chemistry in Ryugu indicate the pristine condition of these asteroid samples.
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hal-04694624 , version 1 (11-09-2024)

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Bradley de Gregorio, George D. Cody, Rhonda M. Stroud, A. L. David Kilcoyne, Scott Sandford, et al.. Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu. Nature Communications, 2024, Nature Communications, 15 (1), pp.7488. ⟨10.1038/s41467-024-51731-w⟩. ⟨hal-04694624⟩
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