Hubble data reveals potential second-generation planet orbiting white dwarf

Astronomers have identified a potential second-generation planet orbiting the white dwarf star HS 0209+0832, located approximately 270 light-years from Earth. If confirmed, this would be the first evidence of a planet forming from the material shed by a star after its death, rather than from the original gas and dust present during a star's birth.

By re-examining Hubble Space Telescope data using updated chemical databases, an international research team led by the University of Warwick discovered unusual chemical signatures in the star's atmosphere. The presence of high levels of niobium, zinc, and copper—combined with a lack of iron and minimal silicon—suggests the star is consuming material from a planet with a composition unlike anything found in our solar system.

A repeating 4.4-day brightness cycle indicates a giant planet may be orbiting close enough to the white dwarf to have its atmosphere stripped away. While researchers currently classify the object as a planet candidate rather than a confirmed world, the findings provide significant insight into how planetary systems might evolve following the collapse of a star.