HI Detection of an Extra-Solar Planetary Atmosphere

Details HI Detection of an Extra-Solar Planetary Atmosphere HI Detection of an Extra-Solar Planetary Atmosphere

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9064v&link_type=abstract

HST Proposal ID #9064

Physics

Hst Proposal Id #9064 Star Formation

Scientific paper

The extra-solar planet discovered around HD 209458 is the unique one also detected through occultation. During its transit, we will obtain spectra of the HI and DI Lyman-Alpha line at 1215 Angstrom. The extremely extended planetary exosphere is expected to produce an absorption line against the stellar chromospheric Lyman-Alpha emission. Because hydrogen is the most abundant element and its scale height in the exosphere is the largest {H is the lightest element}, hydrogen is certainly the best suited species to be detected in an extra-solar planetary atmosphere. From a detection we will better understand the status of such peculiar planetary atmospheres while a non detection should underline possible important missing links in our present views on such subjects. Reference spectra obtained in quadrature position of the planet will give as a by-product the possible detection of extra-solar planetary Lyman-Alpha aurorae. All collected spectra will also allow to evaluate the interstellar D/H ratio on this line of sight.

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