Astronomers Discover Rare Second-Generation Planet Candidate Orbiting White Dwarf
A Jupiter-Sized Survivor Orbiting a Dead Star 270 Light-Years Away
Astronomers have discovered a rare second-generation exoplanet candidate orbiting a white dwarf star located about 250 light-years from Earth, according to research published in Nature Astronomy. The Jupiter-sized gas giant, believed to have formed entirely from the debris and material ejected by its host star as it died, marking a first-of-its-kind detection around this specific type of stellar remnant.
Described by researchers as an unexpected discovery, this celestial body has been dubbed the "Phoenix planet" because its life cycle mirrors the mythical bird that rises from its own ashes. While astronomers have previously detected potential reborn worlds around ultra-dense neutron stars known as pulsars, this marks the very first time such a planet has been spotted around a white dwarf.
Chemical Signatures Reveal a Dead Star’s Debris
The discovery emerged after researchers analyzed unusual chemical footprints within the white dwarf HS 0209+0832. While dead stars typically pull heavy elements down into their cores—leaving primarily hydrogen and helium on their surfaces—this white dwarf displayed massive amounts of niobium, copper, and zinc. The research team also utilized data from the Far Ultraviolet Spectroscopic Explorer (FUSE).
The absence of silicon and iron commonly found in first-generation planets reinforced the conclusion that the material came from an external circumstellar disk rather than a surviving primordial world. When a Sun-like star dies, it first expands rapidly into a red giant and then sheds its outer layers, leaving behind a small, extremely dense and hot core called a white dwarf. Although scientists have previously detected a small number of surviving planets that managed to orbit far enough away to endure this violent transition, they had never before confirmed a second-generation planet born from the wreckage of a dead star. The study’s authors previously published related work on a world around the white dwarf WDJ 0914+1914 in 2019.
Orbital Evidence Captured by NASA Telescopes
Data from NASA’s Transiting Exoplanet Survey Satellite (TESS) and the Hubble Space Telescope provided critical backing for the planetary hypothesis. TESS observations revealed a faint, repeating optical signal every 4.4 days, consistent with a gas giant orbiting just 4% of the distance between Earth and the Sun.
White Dwarf Radiation Strips Planet Atmosphere
Because of this extreme proximity, intense ultraviolet radiation from the hot white dwarf is actively stripping and vaporizing the planet’s outer atmosphere. The vaporized gas subsequently falls onto the surface of the white dwarf, producing the distinct chemical footprint captured by the research team.
Implications for the Ultimate Fate of Our Solar System
While the newly detected body remains classified as a planetary candidate pending further confirmation, the findings suggest that second-generation planets may be significantly more common around white dwarfs than previously assumed. Because more than 95% of stars in the Milky Way will eventually evolve into white dwarfs, the discovery offers a potential preview of future planetary dynamics, including the ultimate fate of our own solar system when the Sun exhausts its nuclear fuel in approximately six billion years.