When stars exhaust their hydrogen fuel, they leave the main sequence and expand into red giants, often engulfing nearby planets. Nevertheless, some worlds have been found to survive this dramatic stellar transformation.
Recent surveys have uncovered several exoplanets that continue to orbit their evolved hosts. These discoveries suggest that planetary systems can be more resilient than previously thought, particularly when the planets are sufficiently massive or located at safe distances during the star’s expansion.
One notable example is a giant planet that resides on an exceptionally tight orbit around its star. The short distance makes it an ideal target for the James Webb Space Telescope, which can perform high‑resolution spectroscopy and photometry to probe the planet’s atmosphere, temperature, and composition.
By measuring the starlight filtered through the planet’s atmosphere during transit, astronomers aim to reconstruct its formation and migration history. Such insights could clarify how planets achieve close‑in orbits around evolved stars and what mechanisms protect them from destruction during the star’s late life stages.