Forbidden Planet TOI-5205 b Defies Space Science Rules | WION Podcast

Ajouté : 2026-05-12

[00:00:00]Welcome to the We on podcast, where we explore fascinating stories and ideas from various fields. In this episode, we explore a cosmic mystery as NASA's James Webb Space Telescope reveals a bizarre alien world that defies the very rules of planet formation. But the real surprise begins with a system that simply shouldn't have formed this way. A massive exoplanet designated TOI-5205b is baffling astronomers. It's a Jupiter-sized gas giant, but it orbits a tiny M dwarf star that is only 40% the mass of our sun.

[00:00:38]According to conventional models of planetary formation, this pairing is forbidden and shouldn't exist.

[00:00:45]To solve this cosmic mystery, an international research team, including experts from the University of Birmingham, turned to the powerful James Space Telescope.

[00:00:55]They analyzed the planet as it transited across its host star, blocking about 6% of the star's light.

[00:01:03]The findings, published in the Astronomical Journal, revealed something shocking.

[00:01:08]The planet's atmosphere is incredibly poor in heavy elements like carbon and oxygen. In fact, it possesses a lower metallicity, abundance of elements heavier than hydrogen and helium, than its own host star.

[00:01:23]"The planet having a lower metallicity than its own host star makes it stand out among all the giant planets studied to date," explained astrophysicist Angeli Piet. Spectrographs detected methane and hydrogen sulfide, but an overall carbon-rich, oxygen-poor environment that is rarely observed.

[00:01:43]So, where did the heavy elements go?

[00:01:46]Models suggest TOI-5205b's overall internal composition is actually up to 100 times richer in heavy elements than its atmosphere.

[00:01:57]This means the heavy materials likely sank deep into the planet's core during formation and stopped mixing with the outer atmospheric layers.

[00:02:07]This landmark study is part of the GEMS survey, a broader initiative focusing on giant planets that orbit small, cool M dwarf stars.

[00:02:18]These bizarre star systems are increasingly becoming the ultimate laboratories for testing the absolute limits of planetary science.

[00:02:27]To gather this data, researchers also had to overcome the challenge of starspots, dark patches on the host star that can massively distort observational data.

[00:02:38]By refining their correction techniques for TOI-5205b, astronomers have paved the way for more accurate Webb observations in the future.

[00:02:48]Thanks for tuning in to this incredible story. If this episode resonated with you, don't forget to hit the like and subscribe button for more captivating stories to come. Stay tuned.