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L\\'opez-Morales, M. Mayor, P. Figueira, R.D. Haywood, S. Udry, V.M. Rajpaul, V. Nascimbeni","submitted_at":"2018-08-24T15:56:32Z","abstract_excerpt":"This paper reports on the validation and mass measurement of K2-263b, a sub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16, we find this planet to have a period of $50.818947\\pm 0.000094$ days and a radius of $2.41\\pm0.12$ R$_{\\oplus}$. We followed this system with HARPS-N to obtain 67 precise radial velocities. A combined fit of the transit and radial velocity data reveals that K2-263b has a mass of $14.8\\pm3.1$ M$_{\\oplus}$. 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