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Title:
The Deep Blue Color of HD 189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths
Authors:
Evans, Thomas M.; Pont, Frédéric; Sing, David K.; Aigrain, Suzanne; Barstow, Joanna K.; Désert, Jean-Michel; Gibson, Neale; Heng, Kevin; Knutson, Heather A.; Lecavelier des Etangs, Alain
Affiliation:
AA(Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK ), AB(School of Physics, University of Exeter, EX4 4QL Exeter, UK), AC(School of Physics, University of Exeter, EX4 4QL Exeter, UK), AD(Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK), AE(Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK), AF(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA ; Sagan Postdoctoral Fellow.), AG(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany), AH(University of Bern, Center for Space and Habitability, Sidlerstrasse 5, CH-3012 Bern, Switzerland), AI(Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA), AJ(Institut d'Astrophysique de Paris, UMR7095 CNRS, Universite Pierre et Marie Curie, 98 bis Boulevard Arago, F-75014 Paris, France)
Publication:
The Astrophysical Journal Letters, Volume 772, Issue 2, article id. L16, 5 pp. (2013). (ApJL Homepage)
Publication Date:
08/2013
Origin:
IOP
Astronomy Keywords:
planets and satellites: atmospheres, stars: individual: HD 189733, techniques: photometric
DOI:
10.1088/2041-8205/772/2/L16
Bibliographic Code:
2013ApJ...772L..16E

Abstract

We present a secondary eclipse observation for the hot Jupiter HD 189733b across the wavelength range 290-570 nm made using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We measure geometric albedos of Ag = 0.40 ± 0.12 across 290-450 nm and Ag < 0.12 across 450-570 nm at 1σ confidence. The albedo decrease toward longer wavelengths is also apparent when using six wavelength bins over the same wavelength range. This can be interpreted as evidence for optically thick reflective clouds on the dayside hemisphere with sodium absorption suppressing the scattered light signal beyond ~450 nm. Our best-fit albedo values imply that HD 189733b would appear a deep blue color at visible wavelengths.
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