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We report the independent discovery and characterization of two K2 planets:K2-180b, a mini-Neptune-size planet in an 8.9-day orbit transiting a V = 12.6mag, metal-poor ([Fe/H] =$-0.65\pm0.10$) K2V star in K2 campaign 5; K2-140b, atransiting hot Jupiter in a 6.6-day orbit around a V = 12.6 mag G6V ([Fe/H] =$+0.10\pm0.10$) star in K2 campaign 10. Our results are based on K2 time-seriesphotometry combined with high-spatial resolution imaging and high-precisionradial velocity measurements. We present the first mass measurement of K2-180b.K2-180b has a mass of $M_\mathrm{p}=11.3\pm1.9$ ${M_{\oplus}}$ and a radius of$R_\mathrm{p}=2.2\pm0.1$ ${R_{\oplus}}$ , yielding a mean density of$\rho_\mathrm{p}=5.6\pm1.9\,g\,cm^{-3}$, suggesting a rock composition. Givenits radius, K2-180b is above the region of the so-called `planetary radiusgap'. K2-180b is in addition not only one of the densest mini-Neptune-sizeplanets, but also one of the few mini-Neptune-size planets known to transit ametal-poor star. We also constrain the planetary and orbital parameters ofK2-140b and show that, given the currently available Doppler measurements, theeccentricity is consistent with zero, contrary to the results of a previousstudy.

K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission