Fig. 4.
Phase-folded radial velocity measurements of GJ 4276, together with the best-fit Keplerian model (black line) overplotted. In the bottom of each panel we show the O − C residuals. Top panel: circular single-planet Keplerian model. Middle panel: eccentric single-planet Keplerian model. Bottom panel: two-planet Keplerian model on circular orbits with a period ratio of 2:1. In addition, we show the best-fit Keplerian model of GJ 4276 b (green dashed line) and GJ 4276 c (red dotted line).
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