One feature of Siril not very known is the photometry. Thanks to it, it is possible to accurately analyze the light coming from the stars. One good application is the exoplanet transit survey.
Indeed, when a planet crosses in front of its parent star’s disk, the whole brightnes of the star will drop by a small amount. This fall can be evaluated thanks to the photometry. It is also possible to compute some interesting values like the radius of the planet.
Here a small example in the following video how do we proceed.
And here, the result we did obtained with @vinvin on two exoplanets: