Preparing sample return from Ryugu and Bennu asteroids with micrometeorites from the Concordia collection

J Duprat (1) , C Engrand (1) , E Dartois (2) , J Mathurin (3) , S Bernard (4) , C Le Guillou (5) , H Leroux (5) , V Vuitton (6) , F.-R Orthous-Daunay (6) , B Auge (1) , B Guerin (1) , J Rojas (1)

1 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
2 ISMO - Institut des Sciences Moléculaires d'Orsay
3 LCPO - Laboratoire de Chimie Physique D'Orsay
4 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
5 UMET - Unité Matériaux et Transformations - UMR 8207
6 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble

Hayabusa 2 and OSIRIS-REx space missions will give a unique access to study the composition of carbonaceous asteroids. A key issue will be the comparison of the organic and mineral compounds from these near-Earth active carbonaceous asteroids with that of carbonaceous chondrites, carbon-rich interplanetary dust particles and cometary samples (81P/Wild2 or in-situ analyses from 67P/CG). The comparison of Ryugu and Bennu samples with chondritic micrometeorites and with extremely carbon-rich interplanetary dust particles such as the Ultra-Carbonaceous MicroMeteorites (UCAMMs) will provide a unique tool to assess their possible links with cometary organics. Analytical methods applied to study micrometeorites from Concordia collection (Antarctica) and the most recent results obtained will be summarised. A particular emphasis will be put on the dedicated experimental protocols that we developed to analyse such micrometeorite fragments and study their mineral-organic association at scales relevant to their intimate association, ranging from tens of nanometers to a few microns.

Mots clés: interplanetary organic matter; micrometeorites; asteroid; space sample return mission; Solar System

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]

J Duprat, C Engrand, E Dartois, J Mathurin, S Bernard, et al.. Preparing sample return from Ryugu and Bennu asteroids with micrometeorites from the Concordia collection. Journées SF2A, May 2019, Nice, France. ⟨hal-03020716⟩