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2587400 
Journal Article 
A POSSIBLE ICY KUIPER BELT AROUND HD 181327 
Chen, CH; Fitzgerald, MP; Smith, PS 
2008 
1 
The Astrophysical Journal
ISSN: 0004-637X
EISSN: 1538-4357 
689 
1 
539-544 
WOS:000262929000047 
We have obtained a Gemini South T-ReCS Qa-band (18.3 mu m) image and a Spitzer MIPS SED-mode observation of HD181327, an F5/F6 V member of the similar to 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 1.4 times brighter than the southern arm. In addition, we detect a broad peak in the combined Spitzer IRS and MIPS spectra at 60-75 mu m 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 blowout size and a(max) = 20 mu m) located at a distance of 86.3 AU from the central star, as observed in previously published scattered-light images. Since the photodesorption lifetime for the icy particles is similar to 1400 yr, significantly less than the estimated similar to 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. 
circumstellar matter; planetary systems: formation; stars: individual (HD 181327)