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Magnesium in the atmosphere of the planet HD209458b: Observations of the thermosphere-exosphere transition region
A. Vidal-Madjar, C. M. Huitson, V. Bourrier +8
We report new near ultraviolet HST/STIS observations of atmospheric absorptions during the planetary transit of HD209458b. We detect absorption in atomic magnesium (MgI), while no…
3D model of hydrogen atmospheric escape from HD209458b and HD189733b: radiative blow-out and stellar wind interactions
Vincent Bourrier, Alain Lecavelier des Etangs
Transit observations in Ly-alpha of HD209458b and HD189733b revealed signatures of neutral hydrogen escaping the planets. We present a 3D particle model of the dynamics of the esca…
Atmospheric escape from HD 189733b observed in HI Lyman-alpha: detailed analysis of HST/STIS September 2011 observations
Vincent Bourrier, Alain Lecavelier des Etangs, Hélène Dupuy +8
Observations of transits of the hot giant exoplanet HD 189733b in the unresolved HI Lyman-alpha line show signs of hydrogen escaping the upper atmosphere of the planet. New resolve…