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K2-291 (EPIC 247418783) is a solar-type star with a radius of R_star = 0.899$\pm$ 0.034 R_sun and mass of M_star=0.934 $\pm$ 0.038 M_sun. From K2 C13 data,we found one super-Earth planet (R_p = 1.589+0.095-0.072 R_Earth) transitingthis star on a short period orbit (P = 2.225177 +6.6e-5 -6.8e-5 days). Wefollowed this system up with adaptive-optic imaging and spectroscopy to derivestellar parameters, search for stellar companions, and determine a planet mass.From our 75 radial velocity measurements using HIRES on Keck I and HARPS-N onTelescopio Nazionale Galileo, we constrained the mass of EPIC 247418783b to M_p= 6.49 $\pm$ 1.16 M_Earth. We found it necessary to model correlated stellaractivity radial velocity signals with a Gaussian process in order to moreaccurately model the effect of stellar noise on our data; the addition of theGaussian process also improved the precision of this mass measurement. With abulk density of 8.84+2.50-2.03 g cm-3, the planet is consistent with anEarth-like rock/iron composition and no substantial gaseous envelope. Such anenvelope, if it existed in the past, was likely eroded away byphoto-evaporation during the first billion years of the star's lifetime.

K2-291 b: A rocky super-Earth in a 2.2 day orbit