@article {1909.04642, archivePrefix = {arXiv}, eprint = {1909.04642}, primaryClass = {astro-ph.EP}, author = {Björn Benneke and others}, title = {Water Vapor on the Habitable-Zone Exoplanet K2-18b}, year = {2019}, url = {http://arxiv.org/abs/1909.04642} }