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The satellite Planetary Transits and Oscillations of stars (PLATO), due to belaunched late 2026, will provide us with an unprecedented sample of lightcurves of solar-type stars that will exhibit both solar-type oscillations andsignatures of activity-induced brightness modulations. Solar-type pulsatorsonly have moderate levels of activity because high levels of activity inhibitoscillations. This means that these targets represent a specific challenge forstarspot modelling. In order to assess the possibilities that PLATO will soonopen, we wish to characterise the morphology of active regions at the surfaceof stars for which we also have a detection of solar-like acousticoscillations. In this context, we report the results of an ensemble starspotmodelling analysis of the Sun and ten solar-type pulsators observed by theKepler satellite. We implement a Bayesian starspot modelling approach based ona continuous-grid model, accounting for the combined starspot and facularcontribution to activity-induced brightness modulations. From our analysis, wefind that several stars of our sample exhibit clear signatures of stablelongitudinal active nests while sharing activity levels and convection versusrotation regimes similar to the solar regime. By searching for modulations inthe reconstructed starspot coverage, we found significant periodicities that weidentify as possible signatures of cyclic modulations similar to thequasi-biennal oscillation or the Rieger cycle. We can infer the correspondingintensity of the magnetic field at the bottom of the convective envelope basedon the hypothesis that internal magneto-Rossby waves acting on the tachoclinecause these modulations.

Tracking active nests in solar-type pulsators: Ensemble starspot modelling of Kepler asteroseismic targets