Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007uasb.conf..267v&link_type=abstract
UV Astronomy: Stars from Birth to Death. Proceedings of the Joint Discussion n.4 during the IAU general Assembly of 2006. Ana I.
Astronomy and Astrophysics
Astronomy
Uv Astronomy, Extrasolar Planets
Scientific paper
More than 200 extrasolar planets have been discovered since 1995, when the first one was detected orbiting the solar type star 51 Peg. The extrasolar planets known so far show a variety of characteristics, in some cases not at all represented in our solar system. The `hot Jupiters`, in particular, were not predicted by models before being discovered: they are gas giant planets orbiting at only few stellar radii. This peculiarity gives us the unique opportunity of exploring their upper atmosphere while they transit in front of their parent star. Among the atmospheric species detected so far with this method, we can list NaI, in the visible, and HI, OIand CII in the far UV. These UV detections, in particular, unveiled a even more striking feature: the upper atmosphere of these exoplanets is evaporating at a very fast pace, almost a `blow off` process.
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