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We present an analysis of the bulk composition of the MEarth transiting superEarth exoplanet GJ 1214b using planet interior structure models. We considerthree possible origins for the gas layer on GJ 1214b: direct accretion of gasfrom the protoplanetary nebula, sublimation of ices, and outgassing from rockymaterial. Armed only with measurements of the planet mass (M_p=6.55+/-0.98M_{earth}), radius (R_p=2.678+/-0.13 R_{earth}), and stellar irradiation level,our main conclusion is that we cannot infer a unique composition. A diverserange of planet interiors fits the measured planet properties. Nonetheless, GJ1214b's relatively low average density (rho_p=1870+/-400 kg m^{-3}) means thatit almost certainly has a significant gas component. Our second majorconclusion is that under most conditions we consider GJ 1214b would not haveliquid water. Even if the outer envelope is predominantly sublimated water ice,the envelope will likely consist of a super-fluid layer sandwiched betweenvapor above and plasma (electrically conductive fluid) below at greater depths.In our models, a low intrinsic planet luminosity (<~2TW) is needed for a waterenvelope on GJ 1214b to pass through the liquid phase.

Three Possible Origins for the Gas Layer on GJ 1214b