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Thermal Evolution of Rotating Lava Worlds

Presentation #617.06 in the session Star-Planet Interactions and Tides.

Published onApr 03, 2024
Thermal Evolution of Rotating Lava Worlds

Planetary rotation periodically changes the incoming stellar flux that keeps the star-facing side of lava worlds in a molten state. Previous studies [1,2] have focused on the evolution of a permanent magma ocean on the dayside of tidally locked planets. Here, we investigate the day-night cycle effect on the thermal evolution of a hemispheric magma ocean on an airless, rotating planet. Our model accounts for heating effect of stellar radiation during the day, radiative cooling and heat flow due to mantle convection. We put constraints on planet size, rotation rate, incident stellar radiation and orbital resonances to understand when lava worlds are a permanent or transient state for those planets. The outcome of the model can inform current and future JWST observations of lava worlds, providing a better understanding of the magma ocean stage lifetime. Preliminary results will be presented at the meeting. References: [1] Léger et al. (2011), Icarus 213(1), 1-11. [2] Boukaré et al. (2015), ApJ 936, 148.

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