JWST Reveals Atmosphere Potential on Unexpectedly Cool 'Lava World'

• Researchers have found evidence that the exoplanet HD 3167 b, despite being categorized as a relatively 'cold' lava world, may possess an atmosphere.
• The discovery, made using NASA’s James Webb Space Telescope (JWST), challenges existing scientific understanding regarding atmospheric retention on lava-covered planets.

Key Characteristics of HD 3167 b

• Distance: Located 154 light-years from Earth.
• Physicality: 1.6 times the radius and 4.8 times the mass of Earth.
• Orbit: Orbits its K-type host star every 0.96 days and is tidally locked.

Discovery Methodology

• Observation: Scientists utilized secondary eclipse observations, where the planet passes behind its star.
• Findings: The planet's surface was significantly cooler than previous models predicted, indicating that heat is being redistributed from the dayside to the night side.

Scientific Context

• Past Assumptions: While high-temperature lava worlds were known to maintain atmospheres through surface evaporation, cooler ones were historically considered bare rock.
• Earth Connection: Researchers believe this study offers a window into the early history of the solar system, specifically the 'magma ocean' stage of early Earth, when terrestrial planets were shaped by intense collisions.