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I have radial velocity data (time, radial velocity amplitude, error). I want to find a periodicity of those data points for which I'm using the Generalized Lomb-Scargle method (https://github.com/mzechmeister/GLS.git). Below is the periodogram I received using this code. As you can see, there are two peaks, one at frequency 0.10633 and another at 0.2205.

Now I want to remove the signal of these frequencies one by one from the periodogram to check whether they are affecting each other or not, but I am not able to understand how.

Here is a link to the data file if needed: Link enter image description here

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  • $\begingroup$ What do you mean to see if they are affecting each other or not? $\endgroup$
    – Jdip
    Commented Dec 27, 2022 at 16:57
  • $\begingroup$ BY removing one of the frequencies, the other peak will remain there or not. Also how the whole signal will get affected by removing that frequency. $\endgroup$
    – Priyash Mistry
    Commented Dec 27, 2022 at 17:57
  • $\begingroup$ But that is not the issue here (that is a part of astronomy and, I will check that letter on) the important part is how can I remove that signal. $\endgroup$
    – Priyash Mistry
    Commented Dec 27, 2022 at 18:04
  • $\begingroup$ Possibly by using best fit sinusoidal signal subtraction, not sure though. $\endgroup$
    – Priyash Mistry
    Commented Dec 27, 2022 at 18:11
  • $\begingroup$ Ok that's what I was afraid of. That's not how this works. Removing the fundamental doesn't remove the harmonics. you need to think about what you're doing here. You have a signal that's already been generated and sampled. If any frequency component $\zeta_1$ had any influence on another $\zeta_2$, that's done. You can remove $\zeta_1$ but $\zeta_2$ will remain. Just like if you put a colored shirt in with your whites, your white socks will come out off-white. Getting rid of the colored shirt after the fact won't magically make the socks white again. $\endgroup$
    – Jdip
    Commented Dec 27, 2022 at 18:18

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