Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112401m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #124.01; Bulletin of the American Astronomical Society, Vol. 39, p.953
Astronomy and Astrophysics
Astronomy
Scientific paper
I will review recent results from mid-IR follow-up imaging observations of 20 debris disks identified with IRAS and Spitzer photometry. Our sample is a subset of nearby ( pc) A-type stars with bright IR excesses discovered by space-based facilities, and we imaged these sources at 10 and 18 microns with Michelle and T-ReCS at the Gemini telescopes. We spatially resolved two of these sources, Zeta Lep and HD 32297, and their dust distributions imply the presence of features similar to those seen in our own solar system, such as an asteroid belt and a snow line, respectively. However, given the estimated distance for the dust (based on IR color temperatures) in the rest of the sources in our sample, it is surprising to have not resolved more of these dust disks. I will discuss the resulting constraints on the disk morphology that would lead to finding an unresolved source with our observing setup and integration times, such as a low surface brightness disk like Vega or a disk more distant than Zeta Lep that similarly has the bulk of its dust within only a few AU.
Moerchen Margaret
Packham Christopher
Telesco Charles
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