Abstracts > sorted by Authors > Brito De Freitas Daniel

In the present study, high-precision time-series photometry for the active stars from different missions (e.g., CoRoT, Kepler, and TESS) is described in the language of multifractals. We explore the potential of using the rescaled range analysis (R/S) and multifractal detrended moving average analysis (MFDMA) methods to characterize the multiscale structure of the observed time series from a sample of 160 000 active stars. As a result, the Hurst exponent (H) derived from both methods shows a strong correlation with the period derived from rotational modulation. In addition, the variability indicators reveal how this correlation follows a high activity line. We also verify that the H-index is an able parameter for distinguishing the different signs of stellar rotation that can exist between the stars with and without differential rotation, as well as the planetary signature. In summary, the results indicate that the Hurst exponent is a promising index for estimating stellar variability. We hope that this statistical framework can contribute to the objectives of the PLATO mission, in particular, in the field of stellar activity and rotation.