Astronomers Discover Evidence of a Planet Born from Stellar Remnants
Astronomers have found what appears to be a planet that formed from the remnants of a dead star, offering new insights into planetary evolution after stellar death. The discovery centers on a white dwarf—the dense core left behind after a sun-like star exhausts its nuclear fuel and sheds its outer layers.
The candidate planet, nicknamed a "phoenix planet" due to its apparent rise from stellar ashes, shows signs of having coalesced from material expelled during its host star's red giant phase. This challenges traditional models of planetary formation, which typically assume planets form during the early life of a protoplanetary disk around a young star.
The finding has significant implications for understanding the long-term fate of our own solar system. When our sun eventually dies—预计在大约五十亿年后—it will expand into a red giant before collapsing into a white dwarf. This discovery suggests that the material ejected during that process could potentially give rise to new planetary bodies in the system's later history.
Researchers detected the planet using observations that revealed material orbiting the white dwarf with characteristics inconsistent with pure asteroid or comet debris, pointing instead to a larger solid body in formation or already formed. While further confirmation is needed, this evidence supports the possibility that planetary systems can experience renewed planet formation long after their initial stellar birth.