Close-in exoplanets are shaped by a complex interplay between atmospheric and dynamical processes. The Desert, Ridge, and Savanna (a lack, overoccurrence, and mild deficit of Neptunes with increasing period) illustrate the sensitivity of these worlds to such processes. Determining how many Neptunes are brought close-in by early disk-driven (maintaining primordial spin-orbit alignment) or late high-eccentricity (generating large misalignments) migration is essential to understand how much atmosphere they lost. This is the goal of the ATREIDES collaboration, which carries out a Rossiter-McLaughlin census of 60 close-in Neptunes with the VLT/ESPRESSO to measure their 3D spin-orbit angle distribution, correlate its shape with the system properties, and relate the fraction of aligned/misaligned Neptunian systems to their migration and erosion histories. I will present the first results of ATREIDES, and our prospects to relate the inner architecture of Neptunian systems with the presence of outer massive companions through RV monitoring programs, in particular with the SOPHIE spectrograph on OHP historical 193cm telescope.
| Subject : | : | Poster |
| Topics | : | Planetary systems, architecture and dynamics |
| Topics | : | Demographics |
| PDF version | : |  PDF version |
