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CoRoT-7 is an active star, whose orbiting planets and their masses have beenunder debate since their initial detection. In the previous studies, CoRoT-7was found to have two planets, CoRoT-7b and CoRoT-7c with orbital periods of0.85 and 3.69 days, and a potential third planet with a period of $\sim$9 days.The existence of the third planet has been questioned as potentially being anactivity-induced artefact. Mass of the transiting planet CoRoT-7b has beenestimated to have widely different values owing to the activity level of theparent star, the consequent Radial Velocity (RV) 'jitter', and the methods usedto rectify this ambiguity. Here we present an analysis of the HARPS archival RVdata of CoRoT-7 using a new wavelength-domain technique, scalpels, to correctfor the stellar activity-induced spectral line-shape changes. Simultaneousmodelling of stellar activity and orbital motions, identified using the l1-periodogram, shows that scalpels effectively reduce the contribution of stellarvariability to the RV signal and enhance the detectability of exoplanets aroundactive stars. Using kima nested-sampling package, we modelled the systemincorporating a Gaussian Process together with scalpels. The resultantposterior distributions favoured a three-planet system comprising twonon-transiting planets, CoRoT-7c and CoRoT-7d with orbital periods of3.697$\pm$0.005 and 8.966$\pm$1.546 days, in addition to the known transitingplanet. The transiting planet CoRoT-7b is found to be a rocky super-Earth witha mass of $M_{b}$=6.06$\pm$0.65 $M_{\oplus}$. The determined masses of$M_{c}$=13.29$\pm$0.69 $M_{\oplus}$ and $M_{d}$=17.14$\pm$2.55 $M_{\oplus}$suggest the non-transiting planets CoRoT-7c and CoRoT-7d to be structurallysimilar to Uranus and Neptune.

The impact of two non-transiting planets and stellar activity on mass determinations for the super-Earth CoRoT-7b