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Di Fabrizio, L. Malavolta, L. Mancini, L. R. Bedin, M. Barbieri, M. Damasso, M. Esposito, M. Gomez-Jimenez, M. Molinaro, M. Rainer, P. Giacobbe, R. Cosentino, R. Gratton, R. Smareglia, R.U. Claudi, R. Zanmar Sanchez, S. Benatti, S. Desidera, S. Murabito, V. Nascimbeni","submitted_at":"2015-08-26T14:57:04Z","abstract_excerpt":"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. 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