2014ApJ...795..166C -
Astrophys. J., 795, 166 (2014/November-2)
Water vapor in the spectrum of the extrasolar planet HD 189733b. II. The eclipse.
CROUZET N., McCULLOUGH P.R., DEMING D. and MADHUSUDHAN N.
Abstract (from CDS):
Spectroscopic observations of exoplanets are crucial to infer the composition and properties of their atmospheres. HD 189733b is one of the most extensively studied exoplanets and is a cornerstone for hot Jupiter models. In this paper, we report the dayside emission spectrum of HD 189733b in the wavelength range 1.1-1.7 µm obtained with the Hubble Space Telescope Wide Field Camera 3 (WFC3) in spatial scan mode. The quality of the data is such that even a straightforward analysis yields a high-precision Poisson noise-limited spectrum: the median 1σ uncertainty is 57 ppm per 0.02 µm bin. We also build a white-light curve correcting for systematic effects and derive an absolute eclipse depth of 96±39 ppm. The resulting spectrum shows marginal evidence for water vapor absorption, but can also be well explained by a blackbody spectrum. However, the combination of these WFC3 data with previous Spitzer photometric observations is best explained by a dayside atmosphere of HD 189733b with no thermal inversion and a nearly solar or subsolar H2 O abundance in a cloud-free atmosphere. Alternatively, this apparent subsolar abundance may be the result of clouds or hazes that future studies need to investigate.
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Journal keyword(s):
methods: observational - planets and satellites: atmospheres - planets and satellites: individual: HD 189733b - techniques: spectroscopic
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