DS10 - Défi des autres savoirs

Residue Analyses from the Heating of processed Interstellar Ice Analogues: understanding the formation of Solar System Organic Matter – RAHIIA_SSOM

Submission summary

Comets and asteroids contain organic material formed very early in the Solar System history. The organic matter found in interplanetary objects may be related to interstellar icy grains present before the Solar System formation or during its formation, in the so-called proto-planetary disk. Organic matter then accretes on planetesimals and comet cores and may undergo hydrothermal alteration and reactions with minerals once water ice starts to melt. The effects of aqueous alteration of organic matter on interplanetary object remain poorly understood, blurring our current understanding of the nature of the accreted organic matter. This organic matter has been delivered on the surface of planets and could constitute a source of precursors for the emergence of life on the primitive Earth. The RAHIIA_SSOM project, thanks to a Laboratory Astrophysics approach developed in the interdisciplinary field of astrochemistry/astrobiology/cosmochemistry, addresses the origin and subsequent chemical evolution of the extraterrestrial organic matter: (1) during the Solar nebula epoch in ices, when subjected to irradiation and thermal alterations, (2) during the Solar System epoch in interplanetary objects, when submitted to hydrothermal or space weathering alterations. Our project relies on the multi-scale and multi-technique analyses of organic residues synthesized in the laboratory in conditions mimicking astrophysical environments. These analogues will be compared to the organic matter of interplanetary objects (comets, asteroids, meteorites, TNO). The comparison will constrain the physical and chemical evolution of interplanetary objects and thus, we will refine the scenario of the formation of their organic matter. The RAHIIA_SSOM project fits in the “Défi des autres savoirs” program of ANR. A key aspect of this project is interdisciplinary collaborations. Funding from ANR will offer a unique opportunity to build a French consortium implying research groups with worldwide expertise in either experimental simulations or characterization of extraterrestrial organics. Our consortium encompasses a wide range of analytical techniques on organic matter synthesised in laboratory in strong connection with extraterrestrial organics in natural objects. It will shed light on new chemical, structural and isotopic information about reaction pathways involved in the evolution of organics from the interstellar medium to interplanetary objects, parent bodies of objects found on Earth (meteorites, micrometeorites) or directly collected by space probes and returned to Earth.

Project coordination

Grégoire DANGER (Physique des Interactions Ioniques et Moleculaires)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

MNHN - UMR 7590 IMPMC Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie
UNICE - ICN Université Nice Sophia Antipolis - Institut de Chimie de Nice
CNRS DR12 _LAM Centre National de la Recherche Scientifique de´le´gation Provence et Corse _Laboratoire d'Astrophysique de Marseille
UPSUD/IAS Université Paris-Sud / Institut d'Astrophysique Spatiale
IPAG - CNRS ALPES Institut de Planetologie et d'Astrophysique de Grenoble
PIIM - AMU Physique des Interactions Ioniques et Moleculaires

Help of the ANR 754,177 euros
Beginning and duration of the scientific project: December 2016 - 48 Months

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