Researchers revisit 1999 Hubble telescope data using an updated chemical database to identify a suspected second-generation planet orbiting a white dwarf star, showcasing how archival astronomical datasets yield new scientific discoveries.
In 1999, the Hubble Space Telescope collected data from a white dwarf star called HS 0209+0832, recording 100 chemical features that could not be explained at the time. Now, researchers led by astronomers from the University of Warwick have published a study in the journal Nature, revealing that this evidence points to the existence of a planet born from the star's remains.
How second-generation planets form
The planets in our solar system are first-generation, meaning they formed from the materials that were present at the birth of the Sun. In contrast, second-generation planets are created from the materials ejected by a dying star.
Study leader Jamie Williams came to this conclusion by comparing decades-old Hubble observations with an updated chemical database. He found that the unknown elements corresponded to niobium, a material that can only form inside dying stars. Niobium levels in this system were a thousand times higher than those in our own Sun.
The future of the planet
Although the white dwarf remains extremely hot and continues to radiate intense heat to the planet, stripping it of its outer layers, researchers estimate that the planet will remain in the star's habitable zone for millions of years.
According to the European Research Council, which funded the research, the HS 0209+0832 system will be the first white dwarf found to host a second-generation planet, if the findings are confirmed.
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