Fakultät für Physik und Astronomie

The origin and evolution of close-in exoplanets

Dr James Owen , Imperial College London, UK

The last decade has taught us exoplanets with radii between 1 and4 Earth radii and orbital periods < 100 days are extremely common, with the majority of stars hosting at least one of these planets. The planets were not predicted by our early planet formation models conditioned on explaining the Solar System. Many of these planets are so low density that the only way to explain their current structure is that they host large, but low mass hydrogen dominated atmospheres. One suggestion for the origin of these planets is that the majority were born with hydrogen dominated atmospheres and that a fraction lost these atmospheres due to photo evaporative driven mass-loss. I will discuss the theory behind this evolutionary pathway; how we can use it to extract the properties of the planet?s when they were born and well as discussing the compositional imprints this process leaves behind in the remaining atmospheres. Those unable to attend the colloquium in person are invited to participate online through Zoom (Meeting ID: 942 0262 2849, passcode 792771) using the link: https://zoom.us/j/94202622849?pwd=dGlPQXBiUytzY1M2UE5oUDRhbzNOZz09 Dr Owen will be based at MPIAstronomie for his visit to Heidelberg and will be available for meetings by arrangement with his host, Laura Kreidberg (kreidberg@mpia.de).

Heidelberg Joint Astronomical Colloquium
26 Jul 2022, 16:00
Physikalisches Institut, Philosophenweg 12, main lecture theatre

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