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Perhaps the systems that can uncover the most information about their formation and evolution are warm giant exoplanets — planets with radii over 4 times that of Earth, with typical periods larger than about 10 days. These systems are thought to be formed by a set of possible mechanisms that lead to directly observed present-day properties that we can study in impressive detail (see Figure 1). Unlike their hotter counterparts, warm giant exoplanets are not impacted by either additional irradiation from their host stars or tidal interactions that could modify their physical & orbital properties and, as such, their present-day properties are true relics of the formation and evolution scenarios that placed them where we observe them today. Despite their importance, only tens of these systems are known, as they are very challenging to detect due to their long periods from ground-based surveys. This is set to change with the Transiting Exoplanet Survey Satellite (TESS) mission, which is expected to increase this number by a factor of 6 with data from its 2-year primary mission only. The number is even larger if we consider the mission has been recently extended for an extra two years. The mission is expected to detect not only the most interesting ones for mass determination, but also the most exciting objects for future atmospheric characterization. This latter is a unique opportunity to start studying cool worlds like the ones in our Solar System, and start bridging the connection with the observed properties of our neighboring planets in it.

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