A gas giant that survived the death of its own star
In short: Imagine a planet orbiting a glowing corpse. WD 1856 b is a gas giant that somehow endured the violent death of its host star, retaining its atmosphere and heat in a way that has left astrophysicists scratching their heads.
WD 1856 b is a rare celestial survivor. It orbits a white dwarf, which is the burned-out core of a dead, sunlike star. While pulsar planets have been observed before, this specific world is notable for its exotic composition and strange formation history, making it one of the most unusual exoplanets ever discovered. Its existence was first announced to the scientific community in 2020. This discovery highlights the unique ways planets can persist after their primary energy source has vanished. It serves as a primary example of a planet orbiting a white dwarf, a category of celestial bodies that shares characteristics with previously seen pulsar planets.
The planet is a massive gas giant with a mass of 13.8 Jupiters. It maintains a very tight orbit, completing a full revolution around its host star every 1.4 days at a distance of just 0.0204 AU. Despite the cataclysmic transition of its star from a living sun to a white dwarf, the planet did not just survive; it kept its atmosphere. The planet has a radius of approximately 0.92782585 times that of Jupiter. Its orbital path is characterized by an eccentricity of 0.0, indicating a perfectly circular path. These specific dimensions and orbital mechanics provide a precise profile of the gas giant's current state.
Recent observations published in Nature revealed that the planet's atmosphere is still warm. This discovery was baffling to the research team because the spectrum was unlike any other exoplanet they had seen. The presence of a persistent, warm atmosphere around a planet orbiting a white dwarf challenges current models of planetary evolution and the survival of planetary structures during stellar death. The lead author of the study, Ryan MacDonald, is an astrophysicist based at the University of St. Andrews in Scotland. His team noted that the unique spectral data caused significant confusion during their analysis. This finding suggests that the planet's atmosphere remains intact despite the extreme environment of a stellar corpse.
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Sources
- Summary by Intellect · source: What's happening on WD 1856 b?
- Also: WD 1856+534 b - NASA Science
- Also: This planet survived the death of its star—and kept its atmosphere
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