Date-compensated Discrete Fourier Transform for Periodicity Detection in Unevenly Astronomical Time Series

摘要

The date-compensated discrete Fourier transform (DCDFT) shows great promise as a method for periodicity detection in astronomical signals, particularly for searching for the evolutive parameters describing the quasi-periodic unevenly sampled time series. The verification indicates that the DCDFT technique is a powerful tool to identify the periodic components in the quasi-periodic unevenly sampled time series. The DCDFT periodograms of the 4.8-, 8- and 14.5-GHz light curves of the blazar S5 0716+714 reveal a stabilized period of about 2200 days in all the three wavebands, which is in accordance with the earlier study.