A transit survey to search for planets around hot subdwarfs

In this presentation I give an insight of my PhD project dedicated to the search for exoplanets around hot subdwarf stars (sdO/B). I use data from the missions Kepler, K2, TESS and CHEOPS, in order to detect transits of close
bodies down to the size of the Earth. This is possible thanks to the small size of this type of star, as we confirmed by performing injection-and-recovery tests. Such bodies are key to understand the fate of close orbiting exoplanets that have been through an engulfment during the Red-Giant-Branch (RGB) phase of their host. But so far no exoplanets have been confirmed around sdO/B and their actual fate still have to be addressed with observational evidence. My project is therefore to perform a transit survey in all available light curves of hot subdwarfs from space-based telescopes (Kepler, K2, TESS, and CHEOPS) in order to compute meaningful statistics regarding planetary occurrences of sub-stellar bodies around hot subdwarfs. Moreover this will provide strong constraints for the survival of exoplanets that endured an engulfment phase, when their host expanded.