David Ehrenreich et al 2007 ApJ 668 L179 doi:10.1086/522792
A Spitzer Search for Water in the Transiting Exoplanet HD 189733b
FREE ISSUEDavid Ehrenreich1, Guillaume Hébrard1, Alain Lecavelier des Etangs1, David K. Sing1, Jean-Michel Désert1, François Bouchy1, Roger Ferlet1 and Alfred Vidal-Madjar1
Show affiliationsWe present Spitzer Space Telescope observations of the extrasolar planet HD 189733b primary transit, obtained simultaneously at 3.6 and 5.8 μm with the Infrared Array Camera. The system parameters, including planetary radius, stellar radius, and impact parameter, are derived from fits to the transit light curves at both wavelengths. We measure two consistent planet-to-star radius ratios, (Rp/R
)3.6 μm = 0.1560 ± 0.0008(stat) ± 0.0002(syst) and (Rp/R)5.8 μm = 0.1541 ± 0.0009(stat) ± 0.0009(syst), which include both the random and systematic errors in the transit baseline. Although planet radii are determined at 1% accuracy, if all uncertainties are taken into account, the resulting error bars are still too large to allow for the detection of atmospheric constituents like water vapor. This illustrates the need to observe multiple transits with the longest possible out-of-transit baseline, in order to achieve the precision required by transmission spectroscopy of giant extrasolar planets.
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Issue 2 (2007 October 20)
Received 2007 March 19, accepted for publication 2007 August 27
Published 2007 October 2
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A Spitzer Search for Water in the Transiting Exoplanet HD 189733b
David Ehrenreich et al 2007 ApJ 668 L179
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