Discovering the Phoenix Planet: A Cosmic Rebirth from Stellar Ashes
A New Kind of Planet Emerges
Washington: In ancient lore, the phoenix symbolizes rebirth, rising from its own ashes after a fiery demise. Astronomers have now identified a planet that embodies this mythical concept.
This exoplanet, a term for planets outside our solar system, is believed to have originated from the remnants of a star slightly larger than our sun, which expelled material during its final stages. It now orbits a white dwarf, the dense core left behind after the star's death.
Classified as a second-generation planet, this celestial body did not form from the typical disk of gas and dust surrounding a young star, like Earth and other first-generation planets. Instead, it emerged from the debris of a dying star.
Jamie Williams, a doctoral astrophysics student at the University of Warwick and the lead author of a recent study published in Nature Astronomy, stated, “This is the first instance of a planet forming around a white dwarf.”
Located approximately 250 light-years away in the constellation Cetus, this gas giant is slightly more massive than Jupiter.
It completes an orbit around the white dwarf every 4.4 days, situated at just 4% of the distance from Earth to the Sun.
Due to its proximity, the intense ultraviolet radiation from the white dwarf is causing the planet's outer atmosphere to evaporate, with some of it falling onto the white dwarf.
The planet's chemical composition supports its classification as a second-generation planet, being rich in elements like niobium, copper, and zinc—substances released by dying stars during their expansion.
Williams remarked, “In mythology, a phoenix is reborn from its ashes. This planet, however, is reborn from the remnants of its host star, marking a new beginning for the planetary system.”
A second-generation planet is defined as one that forms after its host star has died, in this case, after it has transitioned into a white dwarf.
The research team utilized data from the Hubble, TESS, and FUSE telescopes, and they aim to validate their findings with the James Webb Space Telescope.