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We report a 4.8 sigma detection of water absorption features in the day sidespectrum of the hot Jupiter HD 189733 b. We used high-resolution (R~100,000)spectra taken at 3.2 microns with CRIRES on the VLT to trace theradial-velocity shift of the water features in the planet's day side atmosphereduring 5 h of its 2.2 d orbit as it approached secondary eclipse. Despiteconsiderable telluric contamination in this wavelength regime, we detect thesignal within our uncertainties at the expected combination of systemicvelocity (Vsys=-3 +5-6 km/s) and planet orbital velocity (Kp=154 +14-10 km/s),and determine a H2O line contrast ratio of (1.3+/-0.2)x10^-3 with respect tothe stellar continuum. We find no evidence of significant absorption oremission from other carbon-bearing molecules, such as methane, although we donote a marginal increase in the significance of our detection to 5.1 sigma withthe inclusion of carbon dioxide in our template spectrum. This resultdemonstrates that ground-based, high-resolution spectroscopy is suited tofinding not just simple molecules like CO, but also to more complex moleculeslike H2O even in highly telluric contaminated regions of the Earth'stransmission spectrum. It is a powerful tool that can be used for conducting animmediate census of the carbon- and oxygen-bearing molecules in the atmospheresof giant planets, and will potentially allow the formation and migrationhistory of these planets to be constrained by the measurement of theiratmospheric C/O ratios.

Detection of water absorption in the day side atmosphere of HD 189733 b using ground-based high-resolution spectroscopy at 3.2 microns