By Claire Gordon • 09 December 2021 • 18:24
A group of astronomers has discovered one of the biggest planets ever found orbiting a massive and extremely hot two-star system, despite previously believing that such an environment was too inhospitable for a planet to form in.
The planet was discovered by Markus Janson, a professor of astronomy at Stockholm University, and colleagues, according to research published Wednesday in the science journal Nature.
Janson and his colleagues found the planet using the very sophisticated Spectro-Polarimetric High-contrast Exoplanet REsearch instrument (SPHERE) on the European Southern Observatory’s Very Large Telescope in Chile.
Named b Centauri (AB)b or b Centauri b, the planet is an “alien world experiencing conditions completely different from what we face here on Earth and in our Solar System,” astronomers said in a news release.
“It is 10 times more massive than Jupiter, making it one of the biggest planets ever found. Moreover, it revolves around the binary star at a staggering 100 times greater distance than Jupiter does from the Sun, one of the widest orbits discovered yet,“ astronomers explained. “This large distance from the central pair of stars could be key to the planet’s survival.”
Janson said the discovery of the planet around the two-star system completely changes what astronomers previously believed about massive stars hosting planets, and shows that they can, in fact, form in such severe star systems.
The two-star system, also named b Centauri, is 15 million years old and has at least six times the mass of the Sun, making it by far the biggest stellar system around which astronomers have found a planet. Owing to its incredibly high temperatures, the star system, which sits 325 light-years away in the Centaurus constellation, emits large amounts of UV and X-ray radiation.
Prior to its discovery, scientists had been unable to detect any such object around a star more than three times as massive as the Sun. Furthermore, the large mass and heat emitted by the star system strongly impact the surrounding gas, which should technically make it difficult for planets to form.
“We have always had a very solar system-centric view of what planetary systems are ‘supposed’ to look like,” MPIA scientist and co-author Matthias Samland said. “Over the last 10 years, the discovery of many planetary systems in surprising and novel configurations has made us widen our historically narrow view. This discovery adds another exciting chapter to this story, this time for massive stars.”
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