Optical to Near-Infrared Imaging Observations and Modeling of the AU Mic Debris Disk

Details Optical to Near-Infrared Imaging Observations and Modeling of the AU Mic Debris Disk Optical to Near-Infrared Imaging Observations and Modeling of the AU Mic Debris Disk

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560611m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #606.11; Bulletin of the American Astronomical Society, Vol. 36, p.1131

Astronomy and Astrophysics

Astronomy

Scientific paper

We present NICMOS and ACS Hubble Space Telescope coronagraphic imaging observations of the AU Mic debris disk. The disk is resolved from about 9 AU to 200 AU from the star. Preliminary results indicate that the outer disk (beyond 75AU) exhibits a warp, similar to that observed in the Beta Pictoris disk. The sensitivity, wavelength coverage, and PSF stability afforded by our observations provide an accurate measurement of the color gradient of the disk. The optical to near-infrared colors indicate that as the projected distance from the star increases, the dust grains preferentially scatter increasingly bluer light. We compare the observed midplane surface brightness, color, and polarization profiles to models previously suggested in the literature. Results to date indicate that the dynamical models of Strubbe & Chiang (2006) are in qualitative agreement with the observations, assuming reasonable properties for the dust grain composition and porosity.
This work was also supported in part by the University of California Lab Research Program 09-LR-01-118057-GRAJ and NSF AST-0909188. Support for GO-10228 was provided by NASA through a grant from STScI under NASA contract NAS5-26555.

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