Fig. 7
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Radial-velocity measurements of Kepler-68. Top panel: HIRES (red circles) and HARPS-N (blue circles) radial velocities and the bestfit model (black line) with four Keplerians corresponding to the two transiting planets Kepler-68b (P = 5.40 d) and Kepler-68c (P = 9.60 d), and the two cold giant planets Kepler-68d (P = 633 d = 1.7 yr) and Kepler-68e (P ~ 3450 d = 9.4 yr). Middle and bottom panels: phase-folded radial-velocity signals of the cold giant planets Kepler-68d and Kepler-68e. Note: orbital phases equal to 0 and 1 correspond to inferior conjunction.
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