Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9431l&link_type=abstract
HST Proposal ID #9431
Computer Science
Hst Proposal Id #9431
Scientific paper
The gaseous parts of dust disks surrounding main sequence stars have been the subject of intense investigations since 1985. The origin of the gas content was a puzzle around such evolved stars. But the spectral signatures of Beta Pictoris led to the explanation that the gas is probably produced by the evaporation of many small bodies {see Lecavelier et al., 2001, Nature 412, 706}. It is thus believed that BetaPic-like disks are young planetary systems in the clearing-out phase. Our previous HST observations confirmed the presence of gas disks similar to the Beta Pic one. Here we propose new STIS observations of four stars with known circumstellar gas. Four main objectives can be achieved with STIS observations: the determination of the composition of the gas, the investigation of the puzzling high ionization species, the determination of the CO and CI history and monitoring of spectral variability. The analysis of these issues will provide valuable clues to the origin of these gas disks and the subsequent evolution of young planetary systems. In particular, from abundance studies it will be possible to show if the gas is produced by evaporation of bodies like extra-solar comets.
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