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Published on 04 June 2018
Vol. 613
In section 10. Planets and planetary systems
The nature of the TRAPPIST-1 exoplanets
by S. Grimm, B.-O. Demory, M. Gillon, et al. A&A 613, A68
Using time-transit variations and a genetic algorithm, Grimm et al. improve the uncertainties on the internal densities of the TRAPPIST planets by a factor of between five and eight. These results will help shed light on the compositions of these planets and eventually on the formation of this system.