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King, H.P. Osborn, Jeffrey C. Smith, J.F. Otegi, J. Lillo-Box, J.N. Winn, Joel Villase\\~nor, Jon M. Jenkins, Karen A. Collins, Keivan G. Stassun, L.D. Nielsen, M. Deleuil, N.C. Santos, N. Law, N. Scott, Olivier D. S. Demangeon, Paul Str{\\o}m, Peter J. Wheatley, P. Figueira, R.F. D\\'iaz, R. Helled, R. Vanderspek, R. West, S. B. Howell, S. G. Sousa, S. Hoyer, S. Seager, S. Udry, Susana C.C. Barros, Tansu Daylan, V. Adibekyan","submitted_at":"2021-01-12T20:42:30Z","abstract_excerpt":"We report the discovery of HD 110113 b (TOI-755.01), a transiting mini-Neptune exoplanet on a 2.5-day orbit around the solar-analogue HD 110113 (Teff = 5730K). Using TESS photometry and HARPS radial velocities gathered by the NCORES program, we find HD 110113 b has a radius of $2.05\\pm0.12$ $R_\\oplus$ and a mass of $4.55\\pm0.62$ $M_\\oplus$. The resulting density of $2.90^{+0.75}_{-0.59}$ g cm^{-3} is significantly lower than would be expected from a pure-rock world; therefore, HD 110113 b must be a mini-Neptune with a significant volatile atmosphere. 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