Three hydrodynamic mechanisms, shock levitation, Rayleigh-Taylor plumes, and convective rebound, lift cool molecular gas above evolved stars and can explain dimming events like Betelgeuse's Great Dimming.
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Dimming events of evolved stars due to clouds of molecular gas. Scenarios based on 3D radiation-hydrodynamics simulations with CO5BOLD
Three hydrodynamic mechanisms, shock levitation, Rayleigh-Taylor plumes, and convective rebound, lift cool molecular gas above evolved stars and can explain dimming events like Betelgeuse's Great Dimming.