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Lopez, Fatemeh Motalebi, Francesco Pepe, Giampaolo Piotto, Giusi Micela, Helen A. C. Giles, Jeffrey L. Coughlin, John Asher Johnson, Ken Rice, Lars A. Buchhave, Laura Affer, Li Zeng, Luca Malavolta, Mercedes Lopez-Morales, Michel Mayor, Pedro Figueira, Raphaelle D. Haywood, Rosario Cosentino, Stephane Udry, Valerio Nascimbeni, Xavier Dumusque","submitted_at":"2016-09-24T13:21:24Z","abstract_excerpt":"HD 179070, aka Kepler-21, is a V = 8.25 F6IV star and the brightest exoplanet host discovered by Kepler. An early detailed analysis by Howell et al. (2012) of the first thirteen months (Q0 - Q5) of Kepler light curves revealed transits of a planetary companion, Kepler-21b, with a radius of about 1.60 +/- 0.04 R_earth and an orbital period of about 2.7857 days. However, they could not determine the mass of the planet from the initial radial velocity observations with Keck-HIRES, and were only able to impose a 2-sigma upper limit of 10 M_earth. 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