WD 1856+534

An analysis of the transit data in 2020 revealed that it is a Jupiter-like giant planet with a radius over ten times that of Earth's, and orbits its host star closely at a distance of 0.02 astronomical units (AU), with an orbital period 60 times shorter than that of Mercury around the Sun.

[4] Gravitational interactions with the companion stars may have triggered the planet's migration through the Lidov–Kozai mechanism[6][7][8] in a manner similar to some hot Jupiters.

[10] JWST observations seem to disfavour the formation via common envelope and instead favour high eccentricity migration.

[11] The planetary transmission spectrum obtained with GTC OSIRIS is gray and featureless, likely because of the high level of hazes.

The researchers also revised the white dwarf parameters and found a total age of 8-10 billion years, in agreement with the system belonging to the thin disk.