Astronomers discover second-generation Phoenix planet orbiting white dwarf

Astronomers have identified a unique second-generation exoplanet, dubbed a ‘Phoenix planet,’ orbiting the white dwarf HS 0209+0832. Unlike first-generation planets that form alongside their host stars from initial protoplanetary disks, this planet appears to have formed from the material ejected during the host star's death throes.

As stars similar to the Sun reach the end of their lives, they expand into red giants and eventually shed their outer layers, leaving behind a dense, hot core known as a white dwarf. The discovery of this planet suggests that the remnants of a dying star can provide the necessary material to birth new planetary bodies.

Research led by Jamie Williams from the University of Warwick indicates that this planet is likely rich in heavy elements. Notably, astronomers detected niobium in the white dwarf's environment, marking the first time this element has been identified in such a system. This chemical signature supports the theory that the planet was reborn from the heavy elements produced during the star's evolution.