Our analysis of the VLT/HAWK-I data - subsequent to the submission of the discovery paper - resulted in a light curve of high enough precision to firmly reveal the triple nature of the observed eclipse ( Extended Data Fig. We also observed its second transit signal - blended with a transit of planet c - with the HAWK-I infrared imager on the Very Large Telescope (Chile). The seven planets haveĮquilibrium temperatures low enough to make possible liquid water on theirĪmong the three initially reported TRAPPIST-1 planets, one of them - called 'TRAPPIST-1d' in the discovery publication 1 - was identified based on only two transit signals observed at moderate signal-to-noise. This architecture suggests that the planets formedįarther from the star and migrated inward 4, 5. The six inner planets form a near-resonant chain such Reveal that at least seven planets with sizes and masses similar to the Earth That star from the ground and with the Spitzer Space Telescope. Here we report the results of an intensive photometric monitoring campaign of Possible in-depth studies of their atmospheric properties with current andįuture astronomical facilities 1, 2, 3. With the Jupiter-like size of their host star - named TRAPPIST-1 - makes
Indeed, the transiting configuration of these planets combined Star just 8% the mass of the Sun 12 parsecs away 1. A milestone was recently achieved with theĭetection of three Earth-sized planets transiting (i.e.
One focus of modern astronomy is to detect temperate terrestrial exoplanets well-suitedįor atmospheric characterisation.
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