A 70 Micron Study of the Effects of Environment on Protoplanetary Disk Evolution

Computer Science

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Scientific paper

We propose to obtain 70 micron observations of a statistically significant and representative sample of disked young stars in order to test the effect of environment on disk evolution. Theories of the photoionizing influence of massive stars on disks predict significant changes in disk structure on short timescales, including truncation and enhanced dust settling. Irradiated disk models show that far-infrared wavelengths around 70 microns are the most sensitive to changes in disk emission brought about by such structural modifications. In order to test the theoretical predictions, we will observe two regions with different radiation environments, targeting objects known to possess disks based on our Spitzer GTO survey at shorter wavelengths. These earlier observations were relatively shallow and detected very little at 70 microns; the proposed program will be one of the deepest and most comprehensive studies of protoplanetary disks performed to date at this wavelength. The sample spans a representative range of stellar masses and 3.6-24 micron spectral slopes, with generally comparable properties between the two regions except for incident UV flux. With a combination of modeling and a statistical comparison of the two samples, we will determine any systematic differences in far-infrared flux emitted by the disks and assess the role of environment on their evolution.

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