Speaker
Description
The detection of exoplanets using radial velocity (RV) data frequently proved to be a difficult task. It requires the disentangling the periodic planetary signal(s) and the quasi-periodic stellar signal which often is the dominant one. An interesting situation inspired by our recent reanalysis of the RV data on TOI-837 is illustrated using synthetic data. The planetary signal is modeled by a periodic harmonic component, while the quasi-periodic signal is simulated using an adequate discrete second-order autoregressive process. The effect of the data sampling is displayed using both evenly and unevenly spaced data. In the latter situation, the well-known technique of sequential pre-whitening was able to unveil the spectral signatures of both quasi-periodic and periodic components of the synthetic signal. We emphasized that the identification of the symmetrical structure(s) of peaks induced by the spectral window requires the representation of the amplitude/power spectrum versus frequency, in accordance with the definition of the Fourier transform, not versus period.