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Nature et évolution de la surface de Mercure : approche pluridisciplinaire en soutien à la mission spatiale BepiColombo de l'ESA

Abstract : Although close to the Sun, Mercury has a unique surface, poorer in iron than the surface of the Moon, but surprisingly rich in volatile elements. These essential discoveries of the MESSENGER mission have raised questions that the BepiColombo mission (ESA/JAXA) will try to answer, thanks in particular to the SIMBIO-SYS instrument, which will provide spectral images of the Mercury surface with a spatial resolution 10 to 100 times higher than that achieved by MESSENGER. Among these fundamental questions is the accurate chemical and mineralogical composition of Mercury. My thesis adresses the problem through a multidisciplinary approach. A first angle consists in using the data provided by MESSENGER to map in color the Shakespeare quadrangle. My work has made it possible to define 1) spectral units of the quadrangle associated with very precise values of various spectral parameters, and 2) regions of interest to be analyzed and characterized notably by the VIHI hyperspectral imager (0.4-2.0 μm), one of the channels of SIMBIO-SYS. The second angle consists of laboratory experiments : heating, cooling and irradiation of possible mineralogical analogues of Mercury’s surface. The aim is to anticipate the arrival of BepiColombo and to know the effects of these alterations on the spectral properties of the minerals. Results obtained from spectroscopic measurements of hermean mineral analogues subjected to Mercury surface conditions have revealed clear variations in their spectral properties (e.g. position and shape of absorption bands).
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  • HAL Id : tel-02975106, version 2

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Nicolas Bott. Nature et évolution de la surface de Mercure : approche pluridisciplinaire en soutien à la mission spatiale BepiColombo de l'ESA. Planétologie et astrophysique de la terre [astro-ph.EP]. Sorbonne Université, 2019. Français. ⟨NNT : 2019SORUS505⟩. ⟨tel-02975106v2⟩

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