Citation:
Sing D K, Désert J-M, Fortney J J, Lecavelier des Etangs A, Ballester G E, Cepa J, Ehrenreich D, López-Morales M, Pont F, Shabram M, et al. Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry. \aap. 2011;527 :A73.