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We report on the confirmation that the candidate transits observed for thestar EPIC 211525389 are due to a short-period Neptune-sized planet. The hoststar, located in K2 campaign field 5, is a metal-rich ([Fe/H] = 0.26$\pm$0.05)G-dwarf (T_eff = 5430$\pm$70 K and log g = 4.48$\pm$0.09), based onobservations with the High Dispersion Spectrograph (HDS) on the Subaru 8.2mtelescope. High-spatial resolution AO imaging with HiCIAO on the Subarutelescope excludes faint companions near the host star, and the false positiveprobability of this target is found to be <$10^{-6}$ using the open sourcevespa code. A joint analysis of transit light curves from K2 and additionalground-based multi-color transit photometry with MuSCAT on the Okayama 1.88mtelescope gives the orbital period of P = 8.266902$\pm$0.000070 days andconsistent transit depths of $R_p/R_\star \sim 0.035$ or $(R_p/R_\star)^2 \sim0.0012$. The transit depth corresponds to a planetary radius of $R_p =3.59_{-0.39}^{+0.44} R_{\oplus}$, indicating that EPIC 211525389 b is ashort-period Neptune-sized planet. Radial velocities of the host star, obtainedwith the Subaru HDS, lead to a 3\sigma\ upper limit of 90 $M_{\oplus} (0.00027M_{\odot})$ on the mass of EPIC 211525389 b, confirming its planetary nature.We expect this planet, newly named K2-105 b, to be the subject of futurestudies to characterize its mass, atmosphere, spin-orbit (mis)alignment, aswell as investigate the possibility of additional planets in the system.

The K2-ESPRINT Project VI: K2-105 b, a Hot-Neptune around a Metal-rich G-dwarf