New Suns in the Cosmos III: multifractal signature analysis
arXiv:1608.04432 · doi:10.3847/0004-637X/831/1/87
Abstract
In present paper, we investigate the multifractality signatures in hourly time series extracted from CoRoT spacecraft database. Our analysis is intended to highlight the possibility that astrophysical time series can be members of a particular class of complex and dynamic processes which require several photometric variability diagnostics to characterize their structural and topological properties. To achieve this goal, we search for contributions due to nonlinear temporal correlation and effects caused by heavier tails than the Gaussian distribution, using a detrending moving average algorithm for one-dimensional multifractal signals (MFDMA). We observe that the correlation structure is the main source of multifractality, while heavy-tailed distribution plays a minor role in generating the multifractal effects. Our work also reveals that rotation period of stars is inherently scaled by degree of multifractality. As a result, analyzing the multifractal degree of referred series, we uncover an evolution of multifractality from shorter to larger periods.
arXiv comment13 pages, 8 figures, 1 table. Accepted for publication in The Astrophysical Journal
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- On the multiscale behaviour of stellar activity and rotation of the planet host Kepler-30
- New Suns in the Cosmos V: Stellar rotation and multifractality in active \textit{Kepler} stars
- Minimal Data Fidelity for Detection of Stellar Features or Companions