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The goal of this Master thesis is to provide transit timing data of the TRAPPIST-1 system that will be used to support the next generation of TTV study.The 47 new transit timings were obtained from a transit monitoring using the telescope Io from the SSO, between May and December 2019.

TRAPPIST-1 --- Transit method --- Transit timing variations --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique

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Using the open-source tool SHERLOCK with TESS data, a search for promising new multi-planetary systems around M dwarfs has been performed. Among the 56 targets studied in this work, we found three promising candidates for which we performed an in-depth investigation. This led to the conclusion that those objects are likely real planet candidates, for which further observations are required to confirm this hypothesis.

Exoplanets --- Transit method --- M dwarfs --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique

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We combined data from NOMAD/UVIS and EUVM to analyse the time variation of the Martian dayglow. We focused on the 557.7, 297.2 and 360 nm emissions of the atomic oxygen, a well as the UVD, the Cameron bands and the FDB bands emissions.

Airglow --- Dayglow --- Mars --- Planetary atmosphere --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique