TOI-561 b Atmosphere Survived Billions of Years

Recent observations from the James Webb Space Telescope reveal that the distant exoplanet TOI-561 b possesses a significant and highly reflective atmosphere that should have been stripped away billions of years ago by intense stellar radiation. Located approximately 280 light-years from Earth, this extreme lava world reflects roughly 75% of the starlight it receives, maintaining lower dayside temperatures than expected for an exposed molten rock surface. The research team, led by Professor Lisa Dang and including University of Birmingham astrophysicist Dr. Anjali Piette, monitored the planet across four complete orbits using phase curve measurements. Their findings suggest that silicate-mineral clouds composed of silicon dioxide and magnesium silicate act as a protective sunscreen, shielding the surface from radiation while an atmosphere of carbon dioxide or sulfur dioxide is continually replenished by volcanic activity from the molten interior. This discovery challenges current astrophysical models regarding atmospheric survival on heavily irradiated rocky worlds and raises critical questions about planetary evolution and gas retention. The presence of a persistent gas envelope on such a hot exoplanet indicates that planet-wide volcanic outgassing can sustain atmospheres under extreme conditions. Future research will utilize longer wavelength observations with the James Webb Space Telescope to analyze the precise chemical composition of the atmosphere. Determining whether TOI-561 b resembles Venus or an extreme version of Io will help scientists better understand how planetary atmospheres endure intense stellar bombardment over cosmic timescales.