Study of the environment of comet 67P/Churyumov-Gerasimenko based on the data of ROSINA/RTOF onboard the Rosetta mission.

Abstract : The comet 67P/Churyumov-Gerasimenko (67P/C-G) has been investigated by the Rosetta space mission over two years from August 2014 to September 2016. Onboard the spacecraft, the ROSINA experiment included two mass spectrometers (DFMS and RTOF) to detect the composition of neutrals and ions, and a pressure sensor (COPS) to monitor the density and velocity of neutrals in the coma. This thesis details an analysis and discussion of the data of the RTOF instrument during the comet escort phase. We analyse 67P/C-G’s coma over the mission in terms of the main volatiles concentrations (H2O, CO2 and CO) and their ratios. The 2-years-long Rosetta mission allows us to observe the diurnal and seasonal variabilities in the atmosphere of 67P/C-G and strong heterogeneities. This analysis shows that the illumination conditions do not explain all the coma observations, revealing the presence of surface or sub-surface heterogoeneities. Therefore, we use a thermo-physical nucleus model applied to the case of 67P/C-G to investigate the physical processes occurring inside the nucleus and leading to complex coma observations.
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Margaux Hoang. Study of the environment of comet 67P/Churyumov-Gerasimenko based on the data of ROSINA/RTOF onboard the Rosetta mission.. Astrophysics [astro-ph]. Université toulouse 3 Paul Sabatier, 2018. English. ⟨tel-02268406⟩

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