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Damasso, M, Esposito, M, Nascimbeni, V, Desidera, S, Bonomo, AS, Bieryla, A, Malavolta, L, Biazzo, K, Sozzetti, A, Covino, E, Latham, DW, Gandolfi, D, Rainer, M, Petrovich, C, Collins, KA, Boccato, C, Claudi, RU, Cosentino, R, Gratton, R, Lanza, AF, 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, LR, Benatti, S, Borsa, F, Maldonado, J, Mancini, L, Scandariato, G, Southworth, J and Sanchez, RZ (2015) The GAPS programme with HARPS-N at 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. Astronomy & Astrophysics, 581. ISSN 0004-6361

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Abstract

Aims. For more than 1.5 years we spectroscopically monitored the star KELT-6 (BD+31 2447), which is known to host the transiting hot-Saturn KELT-6 b, because a previously observed long-term trend in radial velocity time series suggested that there is an outer companion.

Methods. We collected a total of 93 new spectra with the HARPS-N and TRES spectrographs. A spectroscopic transit of KELT-6 b 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 Mpsin i = 3.71 ± 0.21 MJup and a moderately eccentric orbit (e = 0.21-0.036+0.039) of period P ~ 3.5 years. We improved the orbital solution of KELT-6 b 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 of λ = −36 ± 11 degrees. We improved the KELT-6 b transit ephemeris from photometry and provide new measurements of the stellar parameters. KELT-6 appears as an interesting case for studying the formation and evolution of multi-planet systems.

Item Type: Article
Additional Information: © 2015 EDP Sciences, available from http://dx.doi.org/10.1051/0004-6361/201526995
Uncontrolled Keywords: stars, KELT-6, planetary systems, radial velocities, photometric, astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 22 Apr 2016 15:38
Last Modified: 24 Apr 2019 08:27
URI: https://eprints.keele.ac.uk/id/eprint/1656

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