2576115

Target RA (J2000): 42.984364 and deg Target Dec (J2000): -30.81453 and deg Gaia GMag: 6.25 Programme ID: CH_PR140067 Programme Manager: ALIBERT PI of observing programme: Benz Title of programme: Axis 1 - Probing the architecture-composition-metallicity link (ArchiCHESS) Abstract: Planet formation models predict the existence of a link between the orbital architecture of a planetary system the composition of its planets and the metallicity of the central star. This correlation results from the following two processes: On one hand the temporal evolution of the gas content of the protoplanetary disk causes migration of the planets and therefore determines the orbital architecture of the system. On the other hand the composition of the planets depends on the structure and composition of the disk of solids itself related to the gas content of the disk and the solid-to-gas ratio in the disk. This latter quantity is finally correlated with the stellar metallicity. The goal of ArchiCHESS is to observe multi-planetary systems to constrain their architecture (using architecture coefficients of Mishra et al. 2023) and relate this to the water fractions of the planets as well as to the metallicity of the central star. [truncated! Please see actual data for full text]