Detection of CO in the atmosphere of the hot Jupiter HD 189733b
1 Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB, Torre C5 parell, 2 a pl., 08193 Bellaterra, Spain
2 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
3 Centre for Astrophysics Research, Univ. of Hertfordshire, College Lane, Hatfield (Herts.) AL10 9AB, UK
a e-mail: firstname.lastname@example.org
With time-series spectroscopic observations taken with the Near Infrared Spectrometer (NIRSPEC) at Keck II, we investigated the atmosphere of the close orbiting transiting extrasolar giant planet, HD 189733b. In paticular, we intended to measure the dense absorption line forest around 2.3 micron, which is produced by carbon monoxide (CO). CO is expected to be present in the planetary atmosphere, although no detection of this molecule has been claimed yet. We analyzed the NIRSPEC data with cross-correlation and detect CO absorption in the day-side spectrum of HD 189733b at the known planetary radial velocity semi-amplitude with 99.54% (2.8σ) confidence.
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