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A hydrodynamic study of the atmospheric escape of the hot Jupiter WASP-121b

Presentation #200.07 in the session Exoplanet Atmospheres: Giant Planets (Oral Presentation)

Published onOct 23, 2023
A hydrodynamic study of the atmospheric escape of the hot Jupiter WASP-121b

The escape of the atmosphere plays a crucial role in planetary evolution. Recent advancements in high spectral resolution transmission spectrum observation have provided an exceptional opportunity to investigate the structure of exoplanet upper atmospheres and their escape processes. In this talk, I will introduce a sophisticated forward model by expanding the capability of a one-dimensional model of the upper atmosphere and hydrodynamic escape, to include important processes of atomic metal species. Using this model, we can interpret the detected atomic features in the transmission spectrum of WASP-121b, which originate from material outside the planet’s Roche lobe. By studying these atomic signatures, we can explore the impact of metals and excited hydrogen on the upper atmosphere, gain insights into the mechanisms of atmospheric escape, and emphasize the significance of the high mass-loss rate caused by Roche lobe overflow.

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