Mid-Infrared Images of the Debris Disk around HD 141569

Details Mid-Infrared Images of the Debris Disk around HD 141569 Mid-Infrared Images of the Debris Disk around HD 141569

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...573..425m&link_type=abstract

The Astrophysical Journal, Volume 573, Issue 1, pp. 425-430.

Astronomy and Astrophysics

Astronomy

31

Stars: Circumstellar Matter, Infrared: Stars, Stars: Planetary Systems, Stars: Individual: Henry Draper Number: Hd 141569

Scientific paper

We have imaged the circumstellar debris disk around the A0 Ve/B9.5 Ve star HD 141569 (D=99 pc), at λ=12.5, 17.9, and 20.8 μm using the Keck II telescope, and confirm the general morphology from other recently published mid-infrared observations. Model fits to an assumed flat radially symmetric dust disk yield an inclination i=53deg+/-5deg and a position angle of -6deg+/-4deg for the tilt axis and indicate the presence of a depression in optical depth by a factor of about 4 within a radial distance of 30 AU (0.3") from the star. Such a depression is suggestive of a density depletion and is consistent with published spectral energy distributions that indicate the absence of a near-infrared excess even though a mid-infrared excess is present. Our mid-infrared results, in conjunction with previously published near-infrared scattering images, suggest that the two wavelength regimes are viewing, respectively, the inner and outer parts of a common disk structure, which is dominated by small (probably submicron) grains throughout.

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