Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30765s&link_type=abstract
Spitzer Proposal ID #30765
Other
Scientific paper
Young, edge-on circumstellar disks are uniquely valuable laboratories for the study of planet formation. In these objects, the central star is occulted from direct view, significant stellar PSF artifacts are absent, and the disk is clearly seen as a central dust lane flanked by faint bands of reflected light. The detailed morphology of these nebulae and its variation with wavelength provides crucial information not availble for other young star disks. The disk inclination, density structure, and dust grain properties can be quantitatively constrained by fitting Monte Carlo scattered light models to high resolution images. While edge-on disks are among the best-understood disks in 2-D images, their spectral energy distributions are still poorly characterized and modeled. Very high extinctions and small projected emission regions render the typical edge-on disk extremely faint in the mid- and far- infrared. Infrared measurements are crucial for understanding the inner disk properties, for defining the wavelength where the SED transitions from scattered light to thermal emission, and for diagnosing the presence of large dust grains. We are currently carrying out a multiwavelength Hubble Space Telescope Cycle 14 imaging program studying 15 edge-on disks. A review of the Spitzer ROC shows that adequate MIPS and IRAC measurements already exist for the majority of the targets, but most of them have yet to be observed with IRS. We propose 11.5 hours of Spitzer observations to complete the infrared dataset for the known edge-on disks, primariliy IRS low-resolution spectroscopy, but also cleaning up the MIPS and IRAC results in a few cases. In combination with existing data, the results will provide a complete database of infrared SEDs and high spatial resolution optical/near-IR images for known edge-on disks. The resulting dataset will be a unique resource for modeling work on disk structure and dust grain evolution.
McCabe Caer-Eve
Menard Francois
Padgett Deborah
Pontoppidan Klaus
Stapelfeldt Karl
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