A new method of stellar spectra extraction from MUSE data cube in an high sky emission region: the complex case of Trumpler 14

Understanding how planets form is linked to knowing what the origins of Solar System are and the study of protoplanetary discs (PPD) is fundamental. Studies on PPDs have focused on nearby star-forming regions, they are not representative of the environment where stars and planets form. Stars form in star clusters and the environment has an effect on the disc. It is important to study how discs evolve in young clusters. Many factors take part in the discs evolution and the most important is the external photoevaportation, which is due to the presence of hot stars emitting energetic photons. This radiation evaporates the discs of the nearby stars. It means there are regions in which planets formation is dependent on the presence of hot stars. This work aims to study the external photoevaporation. The studied object is the open cluster Trumpler14 located in the Carina star forming region. The observations are made with MUSE an instrument of the VLT. It is essential for the study because the goal is to extract stars spectra and emission lines originated from disc-star interaction and photoevaporation. The problem is the behavior of the background because the sky around observed stars is emitting in a non homogeneous way and it cannot be easily subtracted from stars spectra. The contribution to the sky emission comes from radiation of massive stars. These create a region of ionized gas emitting in the lines also used as diagnostics for star-disc interaction and photoevaporation. This work also aims to find a method to extract stars spectra in this hostile situation. The interest of producing those spectra is to provide a robust estimate of their emission lines. We were able to detect [OI]line of some stars. Few flux are uncertain due to the sky subtraction. By comparing with external photoevaporation models fluxes from these stars are consistent with large discs. Finding an effective method to extract spectra plays an important role for the future analysis of PPDs in similar regions.