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  1. No Access

    Article

    An absolute sodium abundance for a cloud-free ‘hot Saturn’ exoplanet

    Broad absorption signatures from alkali metals, such as the sodium (Na i) and potassium (K i) resonance doublets, have long been predicted in the optical atmospheric spectra of cloud-free irradiated gas giant exo...

    N. Nikolov, D. K. Sing, J. J. Fortney, J. M. Goyal, B. Drummond, T. M. Evans… in Nature (2018)

  2. No Access

    Article

    An extended upper atmosphere around the extrasolar planet HD209458b

    The planet in the system HD209458 is the first one for which repeated transits across the stellar disk have been observed1,2. Together with radial velocity measurements3, this has led to a determination of the pl...

    A. Vidal-Madjar, A. Lecavelier des Etangs, J.-M. Désert, G. E. Ballester… in Nature (2003)