Juan Alday
I am a planetary scientist interested in understanding the composition, variability, and long-term evolution of planetary atmospheres across the Solar System. My research combines the analysis of space-borne and ground-based observations with the development of numerical models to investigate the physical and chemical processes that shape planetary climates.
I am actively involved in major interplanetary missions, including the ExoMars Trace Gas Orbiter (TGO) and MMX (Martian Moons eXploration), where I contribute to the analysis and interpretation of remote-sensing data. In parallel, I use ground-based telescopes to observe planetary atmospheres. To analyse these data, I am the main developer of archNEMESIS, a radiative transfer and retrieval framework widely used for modelling the spectra from planetary atmospheres.
A central focus of my work is the study of isotopic fractionation as a diagnostic tool for atmospheric processes and climate evolution. By combining numerical models — including photochemistry and atmospheric escape — with observational data, I aim to link present-day atmospheric measurements to the past history of planets such as Mars and Venus, providing insights into their climatic evolution.
I welcome enquiries from students interested in planetary atmospheres or numerical modelling, as well as from researchers seeking collaborative opportunities. If you are interested in contributing to ongoing projects or exploring potential collaborations, please feel free to get in touch via email.


