Imaging and Spectroscopy of Dusty Circumstellar Disks

Details Imaging and Spectroscopy of Dusty Circumstellar Disks Imaging and Spectroscopy of Dusty Circumstellar Disks

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8624w&link_type=abstract

HST Proposal ID #8624

Mathematics

Logic

Hst Proposal Id #8624 Ism And Circumstellar Matter

Scientific paper

Understanding the properties and evolution of dusty disks in the circumstellar environments of young stars is a key element in furthering our concepts of the formation mechanisms of extra-solar planetary systems. In the past year, the advent of NICMOS and STIS coronagraphy has given rise to the first reflected light imaging, other than for Beta Pic, of dusty circumstellar disks with spatially resolved morphological structures. NICMOS has taken a first step in imaging these new disks, elucidating their geometries, morphologies, and bulk photometric properties, while increasing the number of such known systems from one to half a dozen. These dusty disks vary in physical size by over two orders of magnitude and exhibit radial anisotropies in their brightness distributions which may be indicative of dynamical confinement or sculpting of the disk particles by unseen planetary bodies. STIS follow-on imaging and spectroscopy are needed to provide further insight into the nature of the disk particles. With spectra, we will measure the albedo of the disk dust and search for complex molecules and water ice. With coronagraphic images, we will investigate the scattering phase function and hence the composition of the disk dust as well as measure the disk sizes and shapes with high precision. Such observations are of fundamental importance in establishing the physical basis for emergent theories of disk evolution and planet-building.

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