Glowing giants Unravelling extreme close-in exoplanet climates

The interpretation of general trends in exoplanet atmospheres is challenging because they exhibit a wide range of diverse properties in terms of composition, structure, and overall atmospheric physics. In this context, exoplanets in extreme regimes can help to understand global planetary properties.
In this thesis, we focus on a few exoplanets that are outliers in their atmospheric properties and discuss what we can learn about the overall population of hot-Jupiters from these peculiar objects. We present studies of exoplanets in extreme regimes of temperature, of atmospheric timescales and of extreme UV irradiation. We utilize these extremities in an innovative manner to understand the most crucial properties of hot-Jupiters.
Practically, we leverage the unique capabilities of Hubble Space Telescope Wide Field Camera 3 together with novel data analysis techniques to understand the nature of a set of exoplanets that reside under these extreme conditions. Ultimately, the work in this thesis enables us to improve our understanding of exo-atmospheric processes and planet formation that ultimately shape the atmospheres of the hot-Jupiters that we observe today.