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Title:
The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint
Authors:
Wakeford, H. R.; Sing, D. K.; Deming, D.; Lewis, N. K.; Goyal, J.; Wilson, T. J.; Barstow, J.; Kataria, T.; Drummond, B.; Evans, T. M.; Carter, A. L.; Nikolov, N.; Knutson, H. A.; Ballester, G. E.; Mandell, A. M.
Affiliation:
AA(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK ; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA; 0000-0003-4328-3867), AB(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK 0000-0001-6050-7645), AC(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ; Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA 0000-0002-8507-1304), AE(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK), AF(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK), AG(University College London, London, UK 0000-0003-3726-5419), AH(NASA Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA 0000-0003-3759-9080), AI(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK 0000-0001-7589-5484), AJ(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK 0000-0001-5442-1300), AK(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK), AL(Astrophysics Group, University of Exeter, Physics Building, Stocker Road, Devon, EX4 4QL, UK), AM(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA), AN(Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA), AO(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 0000-0002-8119-3355)
Publication:
The Astronomical Journal, Volume 155, Issue 1, article id. 29, 14 pp. (2018). (AJ Homepage)
Publication Date:
01/2018
Origin:
IOP
Astronomy Keywords:
planets and satellites: atmospheres, planets and satellites: individual: WASP-39b, techniques: spectroscopic
DOI:
10.3847/1538-3881/aa9e4e
Bibliographic Code:
2018AJ....155...29W

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.
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