Activity of Toi-3568 and Mass Loss of the Atmosphere of Its Exoplanet in the Sub-Jovian Desert

We considers the properties of the TOI-3568 system, which has a super-Neptune-type planet and which by its properties falls into the region of the sub-Jovian desert. TOI-3568 is a poorly studied dwarf of the spectral class K. On the base of archival measurements of the brightness of TOI-3568 (Kamogata Wide-field Survey) we estimated the possible cyclic long-term variability of the object equal to 1.3, 1.7 and 4.1 years. It is found that TOI-3568 belongs to the number of old stars and can have only moderate or low activity. Calculations of the mass loss from the planet’s atmosphere were carried out using an approximation formula for the atmosphere loss model with an energy limitation. If the star is a low-activity K dwarf then