Citation:
Cloutier R, Astudillo-Defru N, Doyon R, Bonfils X, Almenara J-M, Benneke B, Bouchy F, Delfosse X, Ehrenreich D, Forveille T, et al. Characterization of the K2-18 multi-planetary system with HARPS. A habitable zone super-Earth and discovery of a second, warm super-Earth on a non-coplanar orbit. \aap. 2017;608 :A35.