Modeling of Transit Absorptions of Warm Neptune WASP-69b in the Metastable Helium Line

In this paper, the results of complex numerical modeling of the transit absorptions of hot exoplanet WASP-69b in the metastable helium HeI(23S) line have been presented. The modeling has been provided using a 3D MHD code, which allows for the simulation of effects that influence the absorption profile in various spectral lines and predicts a realistic distribution of the density of the main components and the structure of the interacting flows of planetary and stellar material. It has been shown that the simulated transit absorption profiles closely match the height and width of the measured transit profiles, which allowed for the estimation of the physicochemical parameters in the area of exoplanet WASP-69b.