Bibliographic Details
| Title: |
The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets |
| Authors: |
Bonomo, A. S., Desidera, S., Benatti, S., Borsa, F., Crespi, S., Damasso, M., Lanza, A. F., Sozzetti, A., Lodato, G., Marzari, F., Boccato, C., Claudi, R. U., Cosentino, R., Covino, E., Gratton, R., Maggio, A., Micela, G., Molinari, E., Pagano, I., Piotto, G., Poretti, E., Smareglia, R., Affer, L., Biazzo, K., Bignamini, A., Esposito, M., Giacobbe, P., Hébrard, G., Malavolta, L., Maldonado, J., Mancini, L., Fiorenzano, A. Martinez, Masiero, S., Nascimbeni, V., Pedani, M., Rainer, M., Scandariato, G. |
| Source: |
A&A 602, A107 (2017) |
| Publication Year: |
2017 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| More Details: |
We carried out a Bayesian homogeneous determination of the orbital parameters of 231 transiting giant planets (TGPs) that are alone or have distant companions; we employed DE-MCMC methods to analyse radial-velocity (RV) data from the literature and 782 new high-accuracy RVs obtained with the HARPS-N spectrograph for 45 systems over 3 years. Our work yields the largest sample of systems with a transiting giant exoplanet and coherently determined orbital, planetary, and stellar parameters. We found that the orbital parameters of TGPs in non-compact planetary systems are clearly shaped by tides raised by their host stars. Indeed, the most eccentric planets have relatively large orbital separations and/or high mass ratios, as expected from the equilibrium tide theory. 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 axis and the Roche limit, for well-determined circular orbits peaks at 2.5; this also agrees with expectations from the HEM. The few planets of our sample with circular orbits and $\alpha >5$ values may have migrated through disc-planet interactions instead of HEM. By comparing circularisation times with stellar ages, we found that hot Jupiters with $a < 0.05$ au have modified tidal quality factors $10^{5} < Q'_p < 10^{9}$, and that stellar $Q'_s > 10^{6}-10^{7}$ are required to explain the presence of eccentric planets at the same orbital distance. As a by-product of our analysis, we detected a non-zero eccentricity for HAT-P-29; we determined that five planets that were previously regarded to have hints of non-zero eccentricity have circular orbits or undetermined eccentricities; we unveiled curvatures caused by distant companions in the RV time series of HAT-P-2, HAT-P-22, and HAT-P-29; and we revised the planetary parameters of CoRoT-1b.
Comment: 44 pages (16 pages of main text and figures), 11 figures, 5 longtables, published in Astronomy and Astrophysics, Volume 602, A107 (2017). Tables with new HARPS-N and TRES radial-velocity data (Tables 1 and 2), stellar parameters (Table 7), orbital parameters and RV jitter (Table 8), and planet physical parameters (Table 9) are available as ancillary files (sidebar on the right) |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/201629882 |
| Access URL: |
http://arxiv.org/abs/1704.00373 |
| Accession Number: |
edsarx.1704.00373 |
| Database: |
arXiv |
