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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 apreviously observed long-term trend in radial velocity time series suggestedthe existence of an outer companion. Methods. We collected a total of 93 newspectra with the HARPS-N and TRES spectrographs. A spectroscopic transit ofKELT-6b was observed with HARPS-N, and simultaneous photometry was obtainedwith the IAC-80 telescope. Results. We proved the existence of an outer planetwith a mininum mass M$_{\rm p}$sini=3.71$\pm$0.21 M$_{\rm Jup}$ and amoderately eccentric orbit ($e=0.21_{-0.036}^{+0.039}$) of period P$\sim$3.5years. We improved the orbital solution of KELT-6b and obtained the firstmeasurement of the Rossiter-McLaughlin effect, showing that the planet has alikely circular, prograde, and slightly misaligned orbit, with a projectedspin-orbit angle $\lambda$=$-$36$\pm$11 degrees. We improved the KELT-6btransit ephemeris from photometry, and we provided new measurements of thestellar parameters. KELT-6 appears as an interesting case to study theformation and evolution of multi-planet systems.

astronomy and astrophysics

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