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gaia data release 3 documentation

10.13 Solar-like rotational modulation

10.13.3 Calibration models

At first order, rotational modulation light curves can be modelled with a simple sinusoidal function. If a significant period P is detected in one of the time series segments defined in Section 10.13.4, then the model

m(t)=am+bmcos(2πtP)+cmsin(2πtP) (10.16)

is fitted to each of the m(G,GBP,GRP) time series segments. This produces model coefficients am, bm, and cm for each segment in which a significant period is detected.