Our research activities consist of the remote sensing of terrestrial planets, and more especially on the sounding of their atmospheres composition. In particular, at the moment, our work is mainly focused on the Mars atmosphere. We conduct analyses of the observations taken by the PFS (Planetary Fourier Spectrometer) instrument onboard the Mars Express mission (ESA). We develop new retrieval schemes to improve the detection and quantification of trace species in the Martian atmosphere with the goal of improving the understanding of the atmospheric composition and chemistry. We are also involved in the science team of NOMAD, the Nadir and Occultation for MArs Discovery instrument onboard the ExoMars Trace Gas Orbiter (ESA).