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Rice, L. A. Buchhave, L. Affer, L. Malavolta, M. Gillon, M. Lopez-Morales, M. Mayor, P. Figueira, R. Cosentino, R. D. Haywood, S. Gettel, S. Udry, V. Nascimbeni, X. Dumusque","submitted_at":"2015-07-30T15:07:35Z","abstract_excerpt":"We present here the detection of a system of four low-mass planets around the bright (V=5.5) and close-by (6.5 pc) star HD219134. This is the first result of the Rocky Planet Search program with HARPS-N on the TNG in La Palma. The inner planet orbits the star in 3.0937 +/-0.0004 days, on a quasi-circular orbit with a semi-major axis of 0.0382 +/- 0.0003 AU. Spitzer observations allowed us to detect the transit of the planet in front of the star making HD219134b the nearest known transiting planet to date. 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