Measuring the evaporation of close-in extra-solar planets

Details Measuring the evaporation of close-in extra-solar planets Measuring the evaporation of close-in extra-solar planets

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..221w&link_type=abstract

XMM-Newton Proposal ID #05060701

Physics

Stars, White Dwarfs, Solar System, Hd 189733B, Xmm-Newton Proposal 05060701

Scientific paper

The discovery with HST of evaporation of the transiting exoplanet HD209458b has raised the possibility that the evolution of close-in planets is dominated by mass loss. To date, however, this remains the only detection of evaporation because STIS was lost shortly after making this discovery. Here we show that XMM-Newton transit spectroscopy is also sensitive to absorption by material evaporating from close-in extra-solar planets. Indeed, X-ray continuum absorption has the potential to measure mass loss rates, whereas HST could only place a lower limit. We propose an XMM-Newton transit observation of the nearest and brightest transiting planet, HD189733b. Simultaneous measurement of X-ray irradiation and evaporation rates will provide the first direct test of planetary evaporation models.

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