Non-LTE atomic line formation in accretion disk around young stars

The planets forming in the accretion disk of young stars are yet unseen by the new generation of instruments whereas their study is crucial for understanding the evolution of inner planetary systems. Analysis of stellar spectra provides good proxies for studying and detecting such planetary systems. However, disentangling the signal due to the planets and to the star in stellar spectra could be cumbersome. Therefore, detailed spectral synthesis in realistic simulations of star-planets-disk system are crucial for detecting planets and studying their evolution within the accretion region. This spectral synthesis requires the solution of a set of statistical equilibrium equations for the atomic species of interest. The cornerstone of non equilibrium lines formation is obtaining the levels populations pertaining to the atom for which the lines belong to. In this poster, I present how the non-LTE problem for multi-level atomic systems is implemented and solved in the Monte-Carlo code MCFOST