description GJ 1214 b Overview
GJ 1214 b is a sub-Neptune or "mini-Neptune" exoplanet discovered in 2009 orbiting a red dwarf star approximately 42 light-years from Earth. It is one of the few known low-mass planets that frequently transits its host star, making it an ideal candidate for atmospheric studies. Early spectroscopic observations suggested it might be a "water world" covered by a thick envelope of steam, or a planet shrouded in dense, high-altitude clouds. Its unique characteristics have made it a primary target for the James Webb Space Telescope to model its atmospheric dynamics.
help GJ 1214 b FAQ
Is GJ 1214 b a super-Earth or a mini-Neptune?
Its size and mass fall between Earth and Neptune, but atmospheric evidence favors the description mini-Neptune. It appears to possess a thick atmosphere rather than an exposed rocky surface.
Why was it difficult to identify gases in GJ 1214 b's atmosphere?
Earlier transmission spectra were unusually flat, meaning they lacked strong molecular features. High-altitude haze or clouds can block the deeper atmospheric layers where clearer chemical signatures would form.
What did the James Webb Space Telescope learn about GJ 1214 b?
Webb measured thermal emission across much of the planet's orbit and found a reflective, metal-rich atmosphere with substantial day-to-night heat differences. Those results argue against a simple hydrogen-only envelope.
How long does a year last on GJ 1214 b?
The planet completes an orbit around its red dwarf in about 1.6 Earth days. Its close orbit produces temperatures far too high for an Earth-like surface environment.
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