William Dethier
IA

Abstract
Transit spectroscopy has led to outstanding progress in understanding and characterising the atmosphere of exoplanets. Analysing their absorption spectrum is one of the main diagnostics to study their properties and has provided valuable insights for our comprehension of planetary evolution. However, it has been recently highlighted that faithfully identifying absorption signatures of an atmosphere in absorption spectra is not straightforward. Indeed, the variation of the stellar spectrum over the apparent stellar surface (e.g. stellar rotation and centre-to-limb variations) introduces residual spectral features in the absorption spectrum akin to the signature of an atmosphere. These stellar contaminations can potentially mislead the interpretations of transit observations and jeopardise the quality of the derived atmospheric properties. If you want to know where these contaminations come from and how they affect planetary atmosphere characterisation, join us at the cookie seminar.

2024 March 20, 13:30

IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Classroom)
Rua das Estrelas, 4150-762 Porto