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Updated: Oct 26, 2025
06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
11.7K
Magma Ocean Evolution of the TRAPPIST-1 Planets
Patrick Barth1,2,3, Ludmila Carone3, Rory Barnes4,5
1Centre for Exoplanet Science, University of St Andrews, St Andrews, UK.
Astrobiology
|July 27, 2021
Summary
The magma ocean phase is key to understanding TRAPPIST-1 planets. Models show TRAPPIST-1 f and g likely had steam atmospheres with oxygen, while TRAPPIST-1 e’s atmosphere is uncertain.
Area of Science:
- Planetary Science
- Astrobiology
- Geophysics
Background:
- Potentially habitable exoplanets TRAPPIST-1 e, f, and g may have significant water.
- High stellar activity poses challenges for atmospheric retention and water content.
- Magma ocean phases are critical for understanding early planetary evolution and volatile content.
Purpose of the Study:
- To model the coupled magma ocean and atmospheric evolution of TRAPPIST-1 planets.
- To investigate the impact of tidal heating, radiogenic heating, and initial water content.
- To constrain the water mass fractions and atmospheric composition of TRAPPIST-1 e, f, and g.
Main Methods:
- Developed a versatile magma-ocean evolution model ().
- Integrated models for stellar evolution, atmospheric escape, tidal/radiogenic heating, magma-ocean cooling, and geochemistry.
- Simulated TRAPPIST-1 e, f, and g with varying parameters and validated against GJ 1132b and early Earth.
Main Results:
- Reanalyzed TRAPPIST-1 e, f, and g water mass fractions as 0-0.23, 0.01-0.21, and 0.11-0.24, respectively.
- Model predicts TRAPPIST-1 f and g likely formed with thick steam atmospheres and some oxygen.
- TRAPPIST-1 e's atmospheric composition at solidification remains uncertain.
- Only 3-5% of initial water is retained in the mantle post-magma ocean solidification.
Conclusions:
- Magma ocean modeling is crucial for understanding exoplanet habitability, especially for TRAPPIST-1 planets.
- TRAPPIST-1 f and g likely retained substantial steam atmospheres, influencing their early evolution.
- Further research is needed to fully constrain TRAPPIST-1 e's atmospheric conditions and potential habitability.
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