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TRAPPIST-1c

TRAPPIST-1c is a mainly rocky exoplanet orbiting around the ultracool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation Aquarius. It is the third most massive and third largest planet of the system, with about 131% the mass and 110% the radius of Earth. Its density indicates a primarily rocky composition, and observations by the James Webb Space Telescope announced in 2023 suggests against a thick CO2 atmosphere, however this does not exclude a thick abiotic oxygen-dominated atmosphere as is hypothesized to be common around red dwarf stars.

Physical characteristics
Mass, radius, and temperature TRAPPIST-1c was observed with the transit method, which enabled scientists to calculate its radius. Transit-timing variations and computer simulations were able to determine the mass, density, and gravity of the planet. TRAPPIST-1c is the third-largest planet of the TRAPPIST-1 system, with a radius of . It is also the third-most massive of the system, with a mass of , slightly lower than that of the next most massive, TRAPPIST-1g. An observation of the secondary eclipse of TRAPPIST-1c by the James Webb Space Telescope, announced in 2023 rules out a thick carbon dioxide atmosphere like that of Venus. This is similar to JWST results on the inner planet TRAPPIST-1b announced earlier the same year, which suggest that it does not have a thick CO2 dominated atmosphere. In 2024, transmission spectra of the planet had ruled out a hydrogen-dominated atmosphere with >3σ confidence and an atmosphere rich in water, ammonia or carbon monoxide with a pressure of 1 bar when taking into account stellar contamination. ==See also==
Source: Wikipedia ↗
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