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Latham, Didier Queloz, Dimitar Sasselov, Don Pollacco, Emilio Molinari, Eric Lopez, Fatemeh Motalebi, Francesco Pepe, Giampaolo Piotto, Giusi Micela, Hans Kjeldsen, John Asher Johnson, Ken Rice, Lars A. Buchhave, Laura Affer, Luca Malavolta, Mercedes Lopez-Morales, Mia S. Lundkvist, Michel Mayor, Pedro Figueira, Rapha\\\"elle D. Haywood, Rosario Cosentino, St\\'ephane Udry, Valerio Nascimbeni, Xavier Dumusque","submitted_at":"2016-08-24T14:29:08Z","abstract_excerpt":"Kepler-20 is a solar-type star (V = 12.5) hosting a compact system of five transiting planets, all packed within the orbital distance of Mercury in our own Solar System. A transition from rocky to gaseous planets with a planetary transition radius of ~1.6 REarth has recently been proposed by several publications in the literature (Rogers 2015;Weiss & Marcy 2014). Kepler-20b (Rp ~ 1.9 REarth) has a size beyond this transition radius, however previous mass measurements were not sufficiently precise to allow definite conclusions to be drawn regarding its composition. 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