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Using radial velocity measurements from four instruments, we report the massand density of a $2.043\pm0.069 ~\rm{R}_{\oplus}$ sub-Neptune orbiting thequiet K-dwarf Wolf 503 (HIP 67285). In addition, we present improved orbitaland transit parameters by analyzing previously unused short-cadence $K2$campaign 17 photometry and conduct a joint radial velocity-transit fit toconstrain the eccentricity at $0.41\pm0.05$. The addition of a transitobservation by $Spitzer$ also allows us to refine the orbital ephemeris inanticipation of further follow-up. Our mass determination,$6.26^{+0.69}_{-0.70}~\rm{M}_{\odot}$, in combination with the updated radiusmeasurements, gives Wolf 503 b a bulk density of $\rho = 2.92\pm^{+0.50}_{-0.44}$ $\rm{g}~\rm{cm}^{-3}$. Using interior composition models, wefind this density is consistent with an Earth-like core with either asubstantial $\rm{H}_2\rm{O}$ mass fraction ($45^{+19.12}_{-16.15}\%$) or amodest H/He envelope ($0.5\pm0.28\%$). The low H/He mass fraction, along withthe old age of Wolf 503 ($11\pm2$ Gyrs), makes this sub-Neptune an opportunesubject for testing theories of XUV-driven mass loss while the brightness ofits host ($J=8.3$ mag) makes it an attractive target for transmissionspectroscopy.

Wolf 503 b: Characterization of a Sub-Neptune Orbiting a Metal-Poor K Dwarf