One critical test for planet formation theories is the relationship between the presence of long-period giant planets and the occurrence of close-in low-mass planets. Some in-situ formation models predict a positive correlation between these populations, while inward migration scenarios mostly favor an anti-correlation. Constraints from observational studies remain inconclusive because of small sample sizes and heterogeneous observing strategies. To address this, we have been conducting a long-term radial velocity survey with CORALIE, HARPS, and ESPRESSO, focused on a rigorously selected sample of stars with and without giant planets. Our uniform and homogeneous observing strategy minimizes potential biases, enabling a robust measurement of the occurrence rates.
In this talk, I will present the detection and characterisation of new low-mass planets, as well as the first results from a statistical analysis of the complete sample, comparing the occurrence rates of close-in super-Earths and sub-Neptunes in systems with and without cold giants.
| Subject : | : | Oral presentation |
| Topics | : | Demographics |
| PDF version | : |  PDF version |
