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Capitalizing on the observational advantage offered by its tiny M dwarf host,we present HST/WFC3 grism measurements of the transmission spectrum of thesuper-Earth exoplanet GJ1214b. These are the first published WFC3 observationsof a transiting exoplanet atmosphere. After correcting for a ramp-likeinstrumental systematic, we achieve nearly photon-limited precision in theseobservations, finding the transmission spectrum of GJ1214b to be flat between1.1 and 1.7 microns. Inconsistent with a cloud-free solar compositionatmosphere at 8.2 sigma, the measured achromatic transit depth most likelyimplies a large mean molecular weight for GJ1214b's outer envelope. A denseatmosphere rules out bulk compositions for GJ1214b that explain its largeradius by the presence of a very low density gas layer surrounding the planet.High-altitude clouds can alternatively explain the flat transmission spectrum,but they would need to be optically thick up to 10 mbar or consist of particleswith a range of sizes approaching 1 micron in diameter.

The Flat Transmission Spectrum of the Super-Earth GJ1214b from Wide Field Camera 3 on the Hubble Space Telescope