The life of giant exoplanets
I study the three populations of giant exoplanets to understand how they formed and how they evolved during their life.
When a giant planet has just formed on a wide orbit, at large separations from its host(s) star(s), we can detect it by direct imaging. With the time this exoplanet will migrate inward toward its star, its temperature will increase the closer it gets to its star. By reaching very close-in orbits the planet is in its adult age, we usually call it "hot-Jupiter" and we can detect it with the transit technique.
At some point in time after that, the host star will evolve, and it will possibly become a white dwarf. Even it fate can be hard sometimes and while planets orbiting close to the star will get engulfed or destroyed, some others on far away orbits are lucky and can survive the stellar evolution, settling down to be planets orbiting small white dwarf.
Sometimes planets orbit binary stars, and in that case after the binary evolution, the planet will be bound to a double white dwarf. These are "Magrathea" planets that we can detect with gravitational waves !
"Magrathea" is an ancient planet located in orbit around the twin suns Soulianis and Rahm ("The Hitchhiker's Guide to the Galaxy" - Douglas Adams).
SEARCHING FOR "MAGRATHEA"
The JWST mission in a nutshell
Image Credit: ESA/ATG medialab
The Ariel mission in a nutshell
Image Credit: Franz Kerschbaum
The LISA mission in a nutshell
Image Credit: AEI/MM/exozet