Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...4e..21l&link_type=abstract
The Ultraviolet Universe: Stars from Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August 2006, Prague, Cze
Physics
Scientific paper
Young planetary disks have been widely observed in the ultraviolet during the last two decades. The sensitivity to electronic transition of atoms and ions in the near ultraviolet, and of molecules like CO and H2 in the far ultraviolet, lead to detailed observations of the gaseous content of disks surrounding pre-main sequence and main sequence stars. The main results are the measurements of the physical characteristics of the molecular disk in proto-planetary systems, and the description of the gas phase in few debris disks. In the very particular case of the Beta Pictoris disk, UV and optical spectroscopy lead to the extraordinary discovery of extra-solar comets falling onto the star. We are witnessing a very strong cometary activity in a young planetary system, likely similar to our own Solar system 4 billion years ago.
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