The K2-138 system: A near-resonant chain of five sub-Neptune planets discovered by citizen scientists (Astronomical Journal, 2018)

(untitled) - Christiansen, J; Crossfield, I; Barentsen, G; Lintott, C; Barclay, T; Simmons, B; Petigura, E; Schlieder, J; Dressing, C; Vanderburg, A; Allen, C; McMaster, A; et al.