Kinetic Simulation of Ultra-Hot Jupiter KELT-9b

The ultra-hot Jupiter KELT-9b forces us to reconsider existing models of the upper atmospheres of hot exoplanets, which were previously developed using the example of G or M star systems such as HD209458b and GJ436b. The unique conditions for the interaction of the radiation of an A-class star with the atmosphere necessitate kinetic modeling of excited levels of elements, primarily the hydrogen atom. For KELT-9b, absorption was recorded for several lines of hydrogen and lines of a number of heavy elements, the quantitative interpretation of which is an urgent task. In this work, for the first time, 3D modeling of the atmosphere of a planet with a close location of the Roche lobe has been implemented, taking into account the aeronomy, kinetics of excited hydrogen and several lines of heavy elements.