The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint
Wakeford, H. R.; Sing, D. K.; Deming, D.; Nikolov, N.; Ballester, G. E.; Goyal, J.; Evans, T. M.; Kataria, T.; Lewis, N. K.; Mandell, A. M.; Carter, A. L.; Barstow, J.; Drummond, B.; Wilson, T. J.; Knutson, H. A.
United Kingdom, United States
Abstract
WASP-39b is a hot Saturn-mass exoplanet with a predicted clear atmosphere based on observations in the optical and infrared. Here, we complete the transmission spectrum of the atmosphere with observations in the near-infrared (NIR) over three water absorption features with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) G102 (0.8-1.1 μm) and G141 (1.1-1.7 μm) spectroscopic grisms. We measure the predicted high-amplitude H2O feature centered at 1.4 μm and the smaller amplitude features at 0.95 and 1.2 μm, with a maximum water absorption amplitude of 2.4 planetary scale heights. We incorporate these new NIR measurements into previously published observational measurements to complete the transmission spectrum from 0.3 to 5 μm. From these observed water features, combined with features in the optical and IR, we retrieve a well constrained temperature T eq = 1030{}-20+30 K, and atmospheric metallicity {151}-46+48× solar, which is relatively high with respect to the currently established mass-metallicity trends. This new measurement in the Saturn-mass range hints at further diversity in the planet formation process relative to our solar system giants.