Physics – Optics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934415e&link_type=abstract
American Astronomical Society, AAS Meeting #219, #344.15
Physics
Optics
Scientific paper
We have spatially resolved the debris disk around the A star HD 32297 in scattered light using Keck NIRC2 coronagraphic imaging with adaptive optics in the H and K bands. We used angular differential imaging and the LOCI algorithm to suppress the stellar PSF and reveal the nearly edge-on disk. Although LOCI is effective in subtracting quasistatic speckles in the stellar PSF, its application can result in self-subtraction of the disk signal due to its finite spatial extent. The degree of self-subtraction varies with radius, which would preclude accurate measurement of the surface brightness profile and compromise our inferences regarding the physical processes responsible for the dust distribution. We have developed a new technique to model the effects of self-subtraction on spatially extended emission introduced by the LOCI-processed angular differential imaging. Our method accounts for both the self-subtraction kernel's dependence on LOCI parameters and spatial location. We forward model the structure of the disk and compute the form of the self-subtraction at each radius, and then use this to jointly extract the disk surface brightness, scale height, and midplane location as functions of radius. Our investigation into the inner structure of the disk recovers a previously reported brightness asymmetry. This may be indicative of a perturbed density distribution or a change in average grain properties due to a recent stochastic event. A comparison of the surface brightness and morphology of the disk between two wavelengths can provide insight into the size and distribution of dust grains as well as the grains’ interaction with the surrounding environment. In addition, we can apply our self-subtraction modeling technique to future high-contrast imaging of this system and others like it. This work was supported in part by University of California Lab Research Program 09-LR-01-118057-GRAJ and NSF grant AST-0909188.
Esposito Thomas
Fitzgerald Michael P.
Graham James R.
Kalas Paul
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