Other
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nrdd.conf....5b&link_type=abstract
Proceedings of the Miniworkshop on Nearby Resolved Debris Disks. October 19-20, 2005. Space Telescope Science Institute, Baltimo
Other
Scientific paper
One key element in understanding planet formation, is the characterisation of the formation environment. In particular, the gas content and evolution of a disk is thought to be critical to formation scenarios of both terrestrial and jovian planets. Unfortunately, the gas content of cold circumstellar disks is very difficult to observe, and the evolution of gas in disks thus poorly constrained. In this talk, we discuss the implications of the recent detection of wide-spread gas in the debris disk around beta Pictoris. The observation found the gas to be essentially at rest with respect to the star, which was surprising considering that the radiation pressure from the star on some elements exceeds the gravitational force by several orders of magnitude. To get a quantitative understanding of the gas dynamics we have studied several acceleration and collisional processes potentially important: radiation pressure, global magnetic fields, and collisions between neutral-neutral, ion-ion, ion-neutral, and ion-charged dust. We conclude that the gas observed around beta Pictoris is not primordial, but most probably generated in grain-grain collisions. We also discuss the relevance to other debris disks.
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