A Possible Icy Kuiper Belt around HD 181327

Abstract

We have obtained a Gemini South T-ReCS Qa-band (18.3 micron) image and a Spitzer MIPS SED-mode observation of HD181327, an F5/F6V member of the ~12 Myr old beta Pictoris moving group. We resolve the disk in thermal-emission for the first time and find that the northern arm of the disk is 1.4x brighter than the southern arm. In addition, we detect a broad peak in the combined Spitzer IRS and MIPS spectra at 60 - 75 micron that may be produced by emission from crystalline water ice. We model the IRS and MIPS data using a size distribution of amorphous olivine and water ice grains (dn/da proportional to a^{-2.25} with a_{min} consistent with the minimum blow out size and a_{max} = 20 micron) located at a distance of 86.3 AU from the central star, as observed in previously published scattered-light images. Since the photo-desorption lifetime for the icy particles is ~1400 yr, significantly less than the estimated ~12 Myr age of the system, we hypothesize that we have detected debris that may be steadily replenished by collisions among icy Kuiper belt object-like parent bodies in a newly forming planetary system.

8 pages, 4 figures (including 3 color figures), ApJ, in press

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• A Comprehensive Census of Nearby Infrared Excess Stars
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• The Debris Disk of Vega: A Steady-State Collisional Cascade, Naturally
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• On the Morphology and Chemical Composition of the HR 4796A Debris Disk
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• Extrasolar Asteroid Mining as Forensic Evidence for Extraterrestrial Intelligence
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• A PR drag origin for the Fomalhaut disk's pervasive inner dust: constraints on collisional strengths, icy composition, and embedded planets
• Scattering polarization of 3-$\mu$m water-ice feature by large icy grains
• Sparse aperture masking at the VLT II. Detection limits for the eight debris disks stars $\beta$ Pic, AU Mic, 49 Cet, $\eta$ Tel, Fomalhaut, g Lup, HD181327 and HR8799
• Mid-infrared observations of the circumstellar disks around PDS 66 and CRBR 2422.8-3423
• Water ice in the debris disk around HD 181327
• Absorption of crystalline water ice in the far infrared at different temperatures
• Multi-wavelength aperture polarimetry of debris disc host stars
• The impact of the presence of water ice on the analysis of debris disk observations