The James Webb Space Telescope (JWST) has spotted an intriguing planet named LHS 3844b. This planet is about 30% bigger than Earth and orbits a red dwarf star just 50 light-years away. Discovered in 2018, LHS 3844b is caught in a quick 11-hour orbit, making it very close to its star.
Because of this proximity, any atmosphere LHS 3844b might have had is likely stripped away. The planet is tidally locked, meaning one side always faces the star, while the other remains in darkness. On the sunny side, it gets incredibly hot, reaching 1,000 Kelvin, or over 1,300 degrees Fahrenheit.
Astronomers thought they might see signs of tectonic activity here, similar to what we find on Earth. However, further observations threw cold water on that idea. Using JWST’s Mid-Infrared Instrument, researchers looked at the planet’s infrared emissions. This technique allows them to figure out what LHS 3844b is made of, almost like taking its temperature from afar.
LHS 3844b might have a surface of basalt, a type of volcanic rock. It shares similarities with both the Moon and Earth’s mantle. Scientists are torn between two possibilities for its geology. It could still be active, with volcanic processes shaping its surface. Or, it might be a dead world, worn down over time by impacts and radiation, lacking the protective atmosphere that Earth enjoys.
Sebastian Zieba, a NASA Sagan Fellow, points out that Earth-like plate tectonics probably don’t apply here. This suggests a much drier planet. The absence of volcanic gases like carbon dioxide or sulfur, which are common in Earth’s volcanic activity, further indicates that LHS 3844b is likely inactive now.
So, is LHS 3844b alive or just a relic? Researchers are digging deeper. They’re examining how light interacts with various rock types on the planet’s surface. This process is akin to techniques used to study asteroids in our solar system.
The quest to learn more about LHS 3844b could unlock secrets about other rocky worlds. As Laura Kreidberg, the study’s principal investigator, puts it, these methods may help us understand not just LHS 3844b, but also other exoplanets in our galaxy.
This fascinating research was detailed in Nature Astronomy, showcasing how the James Webb Space Telescope is changing our understanding of the universe. For more about the groundbreaking findings from JWST, check out NASA’s updates here.
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