Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna

Open Access

Fig. 5

RV semi-amplitude <sn>(K)</sn> of rotation-induced signals versus the chromospheric activity level $R'_{H K}$ $R{'_{HK}}$ of 37 stars studied in Suárez Mascareño et al. 2017 (SM+17). The blue star corresponds to the semiamplitude of Candidate#l. The vertical band represents the Vaughan-Preston (V-P) gap (Vaughan & Preston 1980) separating inactive and active stars at $R'_{H K}$ $R{'_{HK}}$ ≃−4.7..

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