Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6772c&link_type=abstract
HST Proposal ID #6772
Computer Science
Hst Proposal Id #6772 Interstellar Medium
Scientific paper
Multicolor imaging polarimetry is an excellent diagnostic of dust grain properties and scattering geometries. We propose to obtain U, B and V band imaging polarimetry of the Beta Pictoris disk to probe the dust grain distribution and composition over the region of the disk extending 4"-15" {65 AU-245 AU} from the central star. This region has been chosen so we can study the transition at 100 AU, reported from coronographic observations, which cannot be explained by current disk models. We plan to use the polarization data to compare grain size distribution and composition in the inner {65 AU-100 AU} and outer {>100 AU} regions of the disk. In addition, we will confirm the polarization asymmetries possibly measured at distances >165 AU, by previous ground- based polarization observations. We will use Mie-theory dust grain modelling to investigate the variations in grain size distribution and composition responsible for these asymmetries. The angular resolution of HST is essential to this program, as polarimetric observations cannot be made this close to the star from the ground. Circumstellar disks around main-sequence stars are generally interpreted as evidence of planetary-system formation: the characterization of their properties is a step towards an understanding of the formation and evolution of planetary systems.
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