Astrophysics

The dark and featureless surface of rocky exoplanet LHS 3844 b from JWST mid-infrared spectroscopy

Sebastian Zieba, Laura Kreidberg

Featured May 29, 2026

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Simply

Using the powerful JWST, scientists peered at a distant rocky planet, LHS 3844 b, and found it has a dark, basalt-like surface with no thick air, much like our Moon, suggesting it's an old, space-weathered world.

In depth

This study presents the first direct characterization of a rocky exoplanet's surface using JWST mid-infrared spectroscopy. The authors obtained a thermal emission spectrum for LHS 3844 b, revealing a dark, low-silica surface consistent with basalt or olivine-rich materials. They systematically ruled out high-silica compositions like granite and disfavored thick atmospheres, concluding the planet likely has an old, space-weathered surface with no accumulated volcanic gases.

Key Takeaways

1
The paper provides the first JWST mid-infrared thermal emission spectrum for a rocky exoplanet, LHS 3844 b, enabling direct surface characterization.
2
The observed spectrum indicates a dark, low-silica surface (e.g., basaltic) and strongly rules out high-silica compositions like granite, even with extreme space weathering.
3
The study places stringent upper limits on atmospheric gases, disfavoring thick CO $_{2}$ or SO $_{2}$ atmospheres and suggesting an airless, space-weathered world.

Conceptual Flow

HIGH LEVEL

Methodology: How was it done?

Scientists collected light from a distant planet, cleaned up the data, and then compared it to many computer models to figure out what the planet is made of and if it has air.

Planet Light Data

Clean and Model

Planet Surface Type

Atmosphere Check

Results: What did they find?

The planet's light showed it has a dark, rocky surface like basalt, and almost no air, suggesting it's an old, dry world.

Observed Planet Light

Compare to Models

Dark, Low-Silica Rock

No Thick Air