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The Deep Blue Color of HD 189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths

Evans, Thomas M. and Pont, Frédéric and Sing, David K. and Aigrain, Suzanne and Barstow, Joanna K. and Désert, Jean-Michel and Gibson, Neale P. and Heng, Kevin and Knutson, Heather A. and Lecavelier des Etangs, Alain (2013) The Deep Blue Color of HD 189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths. Astrophysical Journal Letters, 772 (2). Art. No. L16. ISSN 2041-8205. doi:10.1088/2041-8205/772/2/L16. https://resolver.caltech.edu/CaltechAUTHORS:20130827-152145869

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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 A_g = 0.40 ± 0.12 across 290-450 nm and A_g < 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1088/2041-8205/772/2/L16 DOIArticle
https://arxiv.org/abs/1307.3239arXivDiscussion Paper
ORCID:
AuthorORCID
Evans, Thomas M.0000-0001-5442-1300
Pont, Frédéric0000-0003-0076-5444
Sing, David K.0000-0001-6050-7645
Aigrain, Suzanne0000-0003-1453-0574
Barstow, Joanna K.0000-0003-3726-5419
Désert, Jean-Michel0000-0002-0875-8401
Gibson, Neale P.0000-0002-9308-2353
Heng, Kevin0000-0003-1907-5910
Knutson, Heather A.0000-0002-0822-3095
Lecavelier des Etangs, Alain0000-0002-5637-5253
Additional Information:© 2013 The American Astronomical Society. Received 2013 May 31; accepted 2013 June 15; published 2013 July 11. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
Funders:
Funding AgencyGrant Number
NASANAS 5-26555
Subject Keywords:planets and satellites: atmospheres – stars: individual (HD 189733) – techniques: photometric
Issue or Number:2
DOI:10.1088/2041-8205/772/2/L16
Record Number:CaltechAUTHORS:20130827-152145869
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130827-152145869
Official Citation:The Deep Blue Color of HD 189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths Thomas M. Evans et al. 2013 ApJ 772 L16
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40965
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Aug 2013 23:43
Last Modified:10 Nov 2021 04:24

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