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We carried out a Bayesian homogeneous determination of the orbital parametersof 231 transiting giant planets (TGPs) that are alone or have distantcompanions; we employed DE-MCMC methods to analyse radial-velocity (RV) datafrom the literature and 782 new high-accuracy RVs obtained with the HARPS-Nspectrograph for 45 systems over 3 years. Our work yields the largest sample ofsystems with a transiting giant exoplanet and coherently determined orbital,planetary, and stellar parameters. We found that the orbital parameters of TGPsin non-compact planetary systems are clearly shaped by tides raised by theirhost stars. Indeed, the most eccentric planets have relatively large orbitalseparations and/or high mass ratios, as expected from the equilibrium tidetheory. This feature would be the outcome of high-eccentricity migration (HEM).The distribution of $\alpha=a/a_R$, where $a$ and $a_R$ are the semi-major axisand the Roche limit, for well-determined circular orbits peaks at 2.5; thisalso agrees with expectations from the HEM. The few planets of our sample withcircular orbits and $\alpha >5$ values may have migrated through disc-planetinteractions instead of HEM. By comparing circularisation times with stellarages, we found that hot Jupiters with $a < 0.05$ au have modified tidal qualityfactors $10^{5} < Q'_p < 10^{9}$, and that stellar $Q'_s > 10^{6}-10^{7}$ arerequired to explain the presence of eccentric planets at the same orbitaldistance. As a by-product of our analysis, we detected a non-zero eccentricityfor HAT-P-29; we determined that five planets that were previously regarded tohave hints of non-zero eccentricity have circular orbits or undeterminedeccentricities; we unveiled curvatures caused by distant companions in the RVtime series of HAT-P-2, HAT-P-22, and HAT-P-29; and we revised the planetaryparameters of CoRoT-1b.

astronomy and astrophysics

The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet  migration history via improved eccentricity and mass determination for 231  transiting planets