Seminar


Some things special about NEAs : Geometric and environmental effects on the optical signatures of hydration by Sandra Pottin

Published on March 07, 2019

Spectral signatures of hydration are detected on a majority of Main-Belt Asteroids (MBAs) corresponding to C-types asteroids, while they seem scarce in the Near-Earth Asteroids (NEAs) population. Two space missions are presently “en route” toward possibly volatile-rich near-Earth asteroids (NEAs) (Hayabusa-2 and Osiris-REX) and the origin of this hydration difference remains to be understood. Signatures of aqueous alteration are also recorded in the optical properties of primitive meteorites, (...)

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Characterization by HPLC-HRMS of biological molecules in complex organic materials of interest for planetology by Cédric Wolters

Published on March 07, 2019

The origin of the complex molecules that lead to life on Earth is discussed around two different hypotheses : an exogenic source with comets and asteroids and an endogenic source with atmospheric hazes. The organic matter present in comets and asteroids formed very early in the history of the Solar System and subsequently evolved chemically by irradiation and by aqueous and thermal alteration. Atmospheric hazes are formed locally by the host star irradiation of the atmosphere. This process (...)

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