Uv Spectrophotometry of the Beta Pictoris Circumstellar Disk

Details Uv Spectrophotometry of the Beta Pictoris Circumstellar Disk Uv Spectrophotometry of the Beta Pictoris Circumstellar Disk

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4437c&link_type=abstract

HST Proposal ID #4437

Computer Science

Hst Proposal Id #4437

Scientific paper

The presence of a circumstellar dust disk around Beta Pictoris is currently interpreted in the context of planetary system formation. Knowledge of the size and composition of the dust grains is fundamental to the understanding of the formation, evolution, and lifetime of the protoplanetary disk. Despite many IR and optical observations of the disk, the size and composition of the grain population(s) in the disk remains a subject of controversy. We propose to use the unique capabilities of HST to conduct spectrophotometric observations of the disk 4 arcsec from B Pic. Most of the currently proposed grain compositions have strongly discriminating UV spectral features, such as absorption bands or cutoffs, which are suitable for a diagnostic study of the grain composition. By comparing the HST spectra with published laboratory reflectance spectra and with synthetic reflectance spectra modelled for different grain properties and sizes using Mie scattering theory, we may better constrain the grain properties and refine the current disk models which seek to unify the optical and IR observations of the disk. The HST spectra may also show spectral-line evidence of diatomic species common in comets, which are thought to be the cause of the time-varying absorption line features observed in optical and UV spectra of B Pic itself.

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