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Astrophysics

Strong and variable stratospheric CO emission from lava-planet 55 Cnc e observed with NIRCam/JWST

Ignas Snellen, Yamila Miguel

Featured July 6, 2026

Original Paper

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Simply

Using a powerful space telescope, scientists found strong, changing signals of carbon monoxide gas around a super-hot lava planet, suggesting its atmosphere is dynamic and constantly changing, like a boiling pot.

In depth
The paper leverages high-resolution JWST spectroscopy and cross-correlation techniques to unambiguously detect carbon monoxide (CO) emission from the lava planet 55 Cnc e. This detection, particularly its strong variability, suggests a dynamic, hydrogen-rich atmosphere with a steep thermal inversion, likely linked to outgassing from a reduced magma ocean, rather than a static, equilibrium state.

Key Takeaways

  • 1
    The study achieved the first unambiguous detection of CO emission from the lava planet 55 Cnc e using high-resolution JWST/NIRCam data and cross-correlation.
  • 2
    The observed CO signal is highly variable across different observation epochs, indicating a dynamic rather than static atmosphere, potentially driven by outgassing or magma ocean processes.
  • 3
    Atmospheric modeling suggests the CO signal requires a hydrogen-rich atmosphere with a steep thermal inversion and a very high CO/CO ratio, consistent with outgassing from a reduced magma ocean.

Conceptual Flow

HIGH LEVEL
1
Methodology: Finding Hidden Gases

Scientists looked at the planet's light very closely, then used a special matching game to find tiny patterns of gas that would otherwise be invisible.

Planet's Light Data
Gas Pattern Template
Match Patterns
Gas Detected
2
Results: A Dynamic, Hot Atmosphere

They found a specific gas that changed a lot, meaning the planet's air is not still but moves and changes temperature dramatically, like a stormy sky.

Gas Detected
Changing Over Time
Model Atmosphere
Hot Air Layer
Moving Gas