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Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS

Presentation #609.07 in the session Earths and Super-Earths.

Published onApr 03, 2024
Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS

We report the discovery of Gliese 12 b, an Earth-sized, temperate planet transiting a bright (K 7.8 mag), M4V star only 12 pc away from the Solar System. The star was initially observed by TESS and we performed follow-up observations with CHEOPS, combined with ground-based photometry from SPECULOOS and MINERVA. We statistically validate Gliese 12 b and perform a comprehensive stellar analysis, verifying an orbital period of 12.76 days and a radius of 0.92 RE, resulting in an equilibrium temperature of 315 K. This target has excellent future prospects for precise mass measurement with radial velocity due to the very low stellar activity level of its host star. Gliese 12 b represents one of the best targets for JWST to study whether temperate, terrestrial planets orbiting cool stars can retain their atmospheres, a crucial step to advance our understanding of habitability on Earth and elsewhere.

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