Spitzer and HST transit spectrophotometry of the exoplanet HD189733b

Details Spitzer and HST transit spectrophotometry of the exoplanet HD189733b Spitzer and HST transit spectrophotometry of the exoplanet HD189733b

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..323d&link_type=abstract

SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

Transit observations in the infrared allow the atmospheric content of exoplanets to be determined. Here we present new primary transit observations of the hot-jupiter HD189733b, obtained in the near and mid-IR with Hubble and Spitzer Space Telescopes. The high-S/N photometric transit light curves allow us to improve the precision of the near infrared planet radius. We are able to derive accurate system parameters, including planet-to-star radius ratios, impact parameter, scale of the system, and central time of the transit from fits to the transit light curves. We compare the results obtained here with transmission spectroscopic models and with results from various other observations of this planet. These new observations show that water vapour bandheads are not detected using transmission photometry observations at either 1.6 μm or 3.6 μm. Our results further support that another species must absorb at these wavelengths, at high altitudes, and could be attributed to Rayleigh scattering by haze. Observations at 4.5 μm can also be interpreted as due to the presence of CO and would lead to a large CO/H2O ratio estimated to be between 1 and 60.

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