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EP: Fachverband Extraterrestrische Physik
EP 13: Exoplanets and Astrobiology
EP 13.2: Vortrag
Freitag, 3. April 2020, 10:30–10:45, H-HS VIII
The Size and Shape of Planetary Proto-Atmospheres — •Tobias Moldenhauer1, Rolf Kuiper1, Wilhelm Kley1, and Chris Ormel2 — 1Universität Tübingen, Tübingen, Deutschland — 2Tsinghua University, Beijing, China
Protoplanets formed by core accretion can become massive enough to accrete gas from the disk they are born in. If the planetary proto-atmosphere exceeds a critical mass, runaway gas accretion starts and the planet collapses into a gas giant. In recent years, many close-in super-Earths have been observed which raises the question on how they avoided becoming hot Jupiters. We use three-dimensional radiation-hydrodynamics to simulate the proto-atmosphere in the local frame around the planet. The simulations converge to a quasi-steady state where the velocity field of the gas does not change anymore. In post-processing we then use tracer particles to calculate the shape of the atmosphere and the recycling timescale. Recycling of the atmosphere counteracts the collaps by preventing the gas from cooling efficiently.