The Suspense is Killing Us. The Next Planet in the TRAPPIST System Gets the JWST Treatment By Nancy_A
the innermost planet. It has an orbital distance about one hundredth that of Earth’s, and so is not within the system’s habitable zone. JWST detected no atmosphere at all, which was not unexpected due to the hellish conditions of being so close to the star.
TRAPPIST-1 c orbits its star at a distance of 0.016 AU , completing one orbit in just 2.42 Earth-days. TRAPPIST-1 c is slightly larger than Earth, but has around the same density, which indicates that it must have a rocky composition. JWST’s measurement of 15-micron mid-infrared light emitted by TRAPPIST-1 c suggests that the planet has either a bare rocky surface or a very thin carbon dioxide atmosphere.
This light curve shows the change in brightness of the TRAPPIST-1 system as the second planet, TRAPPIST-1 c, moves behind the star. This phenomenon is known as a secondary eclipse. Astronomers used Webb’s Mid-Infrared Instrument to measure the brightness of mid-infrared light. When the planet is beside the star, the light emitted by both the star and the dayside of the planet reach the telescope, and the system appears brighter.
In addition, a substantial atmosphere of any composition would redistribute heat from the dayside to the nightside, causing the dayside temperature to be lower than it would be without an atmosphere. Because TRAPPIST-1 c orbits so close to its star – about 1/50th the distance between Venus and the Sun – it is thought to be tidally locked, with one side in perpetual daylight and the other in endless darkness.
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