Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8674l&link_type=abstract
HST Proposal ID #8674
Other
Hst Proposal Id #8674 Star Formation
Scientific paper
In the past decade, circumstellar {CS} disks of short-lived dust and gas have been evidenced around Main Sequence {MS} stars {e.g. beta Pictoris}. The dust and gas are probably due to planetesimal collisions and/or comet evaporation. These so called ``second generation disks'' are then believed to trace the history of planetary systems formation, in a stage where planetesimals are numerous and planets may be already formed, i.e. an evolved stage compared to the disks around young stars such as Classical T Tauri stars, but yet prior to mostly dust-free planetary systems such as those revealed by radial velocity searches. We recently began to investigate the missing link between MS and young stars CS environments by searching for second generation disks of dust or gas around the few known old PMS stars and by modeling their CS environments. Our HST/NICMOS images revealed a disk around HD141569 {10 Myrs}, and possibly also {but still to be confirmed} around HD100546 and HD135344. We propose here to use the unprecedent detection capabilities of STIS/CORON to get high signal-to-noise {SN} images of HD141569 and HD135344. This will allow to study in much more detail the HD141569 disk, to confirm or infirm the other disk, and to perform fine modeling of the CS dust. This is a key step in the study of the complete evolution of {proto}planetary systems, from the PMS to the MS stages.
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