Why some lava-covered exoplanets retain atmospheres for billions of years
Stanford researchers have offered an explanation for why some sizzling, lava-covered worlds nestled tightly around their stars can retain their atmospheres. At such close quarters, intense stellar radiation should strip away a planet's air.
Researchers from Stanford University have uncovered the reason behind some extremely hot, lava-covered exoplanets retaining their atmospheres for billions of years. These worlds are situated so close to their stars that intense radiation from the star should normally strip away the planet's atmosphere. However, new modeling by researchers suggests that these lava worlds can maintain thick gaseous envelopes due to molten rock covering their surfaces.
This molten rock slows the release of gases from the planet's interior into the atmosphere, effectively balancing atmospheric loss caused by stellar radiation. The findings challenge existing theories on planetary atmospheres and expand our understanding of the factors that determine where the "cosmic shoreline" lies, which marks the boundary between planets with and without atmospheres.
This discovery has significant implications for the search for extraterrestrial life, as it suggests that the traditional strategy of looking for planets with water should be replaced by focusing on planets with atmospheres.
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