Bibliographic Details
| Title: |
The GAPS Programme with HARPS-N@TNG IX. The multi-planet system KELT-6: detection of the planet KELT-6 c and measurement of the Rossiter-McLaughlin effect for KELT-6 b |
| Authors: |
Damasso, M., Esposito, M., Nascimbeni, V., Desidera, S., Bonomo, A. S., Bieryla, A., Malavolta, L., Biazzo, K., Sozzetti, A., Covino, E., Latham, D. W., Gandolfi, D., Rainer, M., Petrovich, C., Collins, K. A., Boccato, C., Claudi, R. U., Cosentino, R., Gratton, R., Lanza, A. F., Maggio, A., Micela, G., Molinari, E., Pagano, I., Piotto, G., Poretti, E., Smareglia, R., Di Fabrizio, L., Giacobbe, P., Gomez-Jimenez, M., Murabito, S., Molinaro, M., Affer, L., Barbieri, M., Bedin, L. R., Benatti, S., Borsa, F., Maldonado, J., Mancini, L., Scandariato, G., Southworth, J., Sanchez, R. Zanmar |
| Source: |
A&A 581, L6 (2015) |
| Publication Year: |
2015 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| More Details: |
Aims. For more than 1.5 years we monitored spectroscopically the star KELT-6 (BD+312447), known to host the transiting hot Saturn KELT-6b, because a previously observed long-term trend in radial velocity time series suggested the existence of an outer companion. Methods. We collected a total of 93 new spectra with the HARPS-N and TRES spectrographs. A spectroscopic transit of KELT-6b was observed with HARPS-N, and simultaneous photometry was obtained with the IAC-80 telescope. Results. We proved the existence of an outer planet with a mininum mass M$_{\rm p}$sini=3.71$\pm$0.21 M$_{\rm Jup}$ and a moderately eccentric orbit ($e=0.21_{-0.036}^{+0.039}$) of period P$\sim$3.5 years. We improved the orbital solution of KELT-6b and obtained the first measurement of the Rossiter-McLaughlin effect, showing that the planet has a likely circular, prograde, and slightly misaligned orbit, with a projected spin-orbit angle $\lambda$=$-$36$\pm$11 degrees. We improved the KELT-6b transit ephemeris from photometry, and we provided new measurements of the stellar parameters. KELT-6 appears as an interesting case to study the formation and evolution of multi-planet systems.
Comment: Letter, 4 figures, accepted for publication in A&A. Some language editing and numbering of the paper series changed (from X to IX) |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/201526995 |
| Access URL: |
http://arxiv.org/abs/1508.06520 |
| Accession Number: |
edsarx.1508.06520 |
| Database: |
arXiv |
