A New Planet May Have Formed From a Dying Star’s Remains

A New Planet May Have Formed From a Dying Star’s Remains

A star’s death may sometimes mark the beginning of a new world. Researchers have found evidence suggesting that a planet formed from material released by its host star during the final stages of its life.

The possible planet, thought to be a gas giant, is associated with HS 0209+0832, a white dwarf roughly 270 light-years from Earth. In a study published in Nature Astronomy, scientists analyzed observations from NASA’s Hubble Space Telescope and other instruments to investigate the unusual chemistry surrounding this stellar remnant.

White dwarfs are what remain after stars similar to our Sun exhaust their fuel. Before reaching this stage, a star expands into a red giant and releases its outer layers into space, leaving behind a compact, hot core. Planets in sufficiently distant orbits can survive that transformation. This discovery, however, points to a different possibility: a planet assembled afterward from the material the dying star left behind.

The strongest clue comes from heavy elements detected in the white dwarf’s atmosphere. Researchers believe these elements arrived in material falling onto the star from a planetary source. Among them was niobium, which the team reports detecting in a white dwarf for the first time.

Lead researcher Jamie Williams, a doctoral student at the University of Warwick, and his colleagues interpret the unusual abundance of niobium as evidence that the planetary material originated in the star’s final stages.

Although the planet’s formation history remains uncertain, the findings could represent the first evidence of a “second-generation” planet—a world born after its original star had already died.