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The six planets of the Kepler-11 system are the archetypal example of apopulation of surprisingly low-density transiting planets revealed by theKepler mission. We have determined the fundamental parameters and chemicalcomposition of the Kepler-11 host star to unprecedented precision using anextremely high quality spectrum from Keck-HIRES (R$\simeq$67,000, S/N perpixel$\simeq$260 at 600 nm). Contrary to previously published results, ourspectroscopic constraints indicate that Kepler-11 is a young main-sequencesolar twin. The revised stellar parameters and new analysis raise the densitiesof the Kepler-11 planets by between 20-95% per planet, making them more typicalof the emerging class of "puffy" close-in exoplanets. We obtain photosphericabundances of 22 elements and find that Kepler-11 has an abundance patternsimilar to that of the Sun with a slightly higher overall metallicity. Weadditionally analyze the Kepler lightcurves using a photodynamical model anddiscuss the tension between spectroscopic and transit/TTV-based stellar densityestimates.

Kepler-11 is a Solar Twin: Revising the Masses and Radii of Benchmark Planets Via Precise Stellar Characterization