Public thesis talk by Emile Ducreux

In the framework of a joint PhD thesis, Emile Ducreux (Physics) will give his talk in the form of a seminar on January 23, 2023, in Namur (Belgium) and will defend his PhD thesis in Reims (France) on January 30. Both are public!

Title: Etude de la vapeur d’eau det de ses isotologues deutérés dans les atmospheres riches en CO₂

ABSTRACT
This thesis tackles key challenges in spectroscopy for studying CO₂-rich planetary atmospheres, such as those of Venus and Mars. Although present only in trace amounts, water vapor — its abundance, vertical distribution, and D/H isotopic ratio — is a crucial indicator for understanding these atmospheres. The work experimentally investigates the line-shape parameters of H₂O and HDO diluted in CO₂ using high-resolution Fourier-transform infrared spectroscopy. It also examines the impact of these new parameters on radiative transfer modeling in Venus’ atmosphere. Simulations reveal how using CO₂-specific collisional data significantly alters water vapor spectral inversions. These findings contribute directly to the scientific preparation of the upcoming European Space Agency - ESA space mission EnVision.

JURY
Dr David Jacquemart, Sorbonne Université, France
Prof. Muriel Lepère, Institute of Life, Earth and Environment - ILEE, Université de Namur (thesis promotor)
Dr Emmanuel Marcq, UVSQ Université de Versailles Saint-Quentin-en-Yvelines, France
Dr Laurence Régalia, Université de Reims Champagne-Ardenne, France (thesis promotor)
Dr Séverine Robert, Royal Belgian Institute for Space Aeronomy, Belgium (thesis co-promotor)
Dr Ha Tran, Sorbonne Université, France