Dynamics in the atmosphere of the evaporating planet HD189733b

Details Dynamics in the atmosphere of the evaporating planet HD189733b Dynamics in the atmosphere of the evaporating planet HD189733b

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11673l&link_type=abstract

HST Proposal ID #11673. Cycle 17

Physics

Scientific paper

With HST/STIS, we detected and characterized the upper atmosphere of the extrasolar planet HD209458b, showing that the planet must be evaporating at a rate of 10^10 g/s in a "blow-off" mechanism. More recently, using ACS we concluded that HD189733b is also evaporating. However, because of the low resolution of the ACS prism spectroscopy, the escape rate and mechanism are still to be determined. This is one of the prime objectives of the present proposal. COS observations of the absorption line profile with 15 km/s resolution will allow us to probe the dynamics of the escaping gas, and therefore to determine the escape rate. Simultaneous observations of the transit depth and spectral shape in several important lines {not only HI, but also OI, CII and possibly NI} will constrain the escape mechanism and allow us to distinguish between several scenarios. The results will enlighten the physical phenomenons at work in the exosphere of these extrasolar planets, and provide new constraints for the modeling of the evaporation of hot-Jupiters.;

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