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The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
Abstract K2-138 is a moderately bright ( V = 12.2, K = 10.3) main-sequence K star observed in Campaign 12 of the NASA K2 mission. It hosts five small (1.6–3.3 <?CDATA ${R}_{\oplus }$?> ) transiting planets in a compact architecture. The periods of the five planets are 2.35, 3.56, 5.40, …