Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-29
Astronomy and Astrophysics
Astrophysics
To appear in the proceedings of the annual meeting of the French Society of Astronomy and Astrophysics (SF2A) Paris, July 2008
Scientific paper
Extrasolar planetary transits are powerful tools to probe their atmosphere and to extract key physical properties of planets, like their mean densities, chemical compositions, or atmospheric structures. Every 3.5 days, the transits of the gaseous planet orbiting HD209458 offer the opportunity to investigate the spectral features of its atmosphere. We present here NUV transmission spectroscopy of the transiting extrasolar planet HD209458b using HST/ACS. We show the data analysis of the seven HST orbits which were used to observe two transits of HD209458b. Due to various remaining systematics, the radius of the planet in the NUV could not be extracted with a high precison. However, we derived a radius of Rp=1.4Rjup+/-0.08 between 2800 and 3100 AA which is consistent with previous measurements in the visible.
des Etangs Alain Lecavelier
Desert Jean-Michel
Ferlet Roger
Hebrard Guillaume
Vidal-Madjar Alfred
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