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Gonz\\'alez-Gait\\'an, S. J. Smartt, S. Mattila, S. Valenti, T. B. Lowe, T. Kr\\\"uhler, T.-W. Chen","submitted_at":"2018-05-11T14:57:17Z","abstract_excerpt":"Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae. However, while such stars are observed with masses >25M$_\\odot$, detections of >18M$_\\odot$ progenitors remain elusive. Red supergiants are also expected to form at all metallicities, but discoveries of explosions from low-metallicity progenitors are scarce. 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