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Observations from the Herschel Space Observatory have more than doubled thenumber of wide debris disks orbiting Sunlike stars to include over 30 systemswith R > 100 AU. Here we present new Herschel PACS and re-analyzed Spitzer MIPSphotometry of five Sunlike stars with wide debris disks, from Kuiper belt sizeto R > 150 AU. The disk surrounding HD 105211 is well resolved, with an angularextent of >14" along the major axis, and the disks of HD 33636, HD 50554, andHD 52265 are extended beyond the PACS PSF size (50% of energy enclosed withinradius 4.23"). HD 105211 also has a 24-micron infrared excess that waspreviously overlooked because of a poorly constrained photospheric model.Archival Spitzer IRS observations indicate that the disks have small grains ofminimum radius ~3 microns, though the minimum grain gradius is larger than theradiation pressure blowout size in all systems. If modeled assingle-temperature blackbodies, the disk temperatures would all be <60 K. Ourradiative transfer models predict actual disk radii approximately twice theradius of model blackbody disks. We find that the Herschel photometry tracesdust near the source population of planetesimals. The disk luminosities are inthe range 0.00002 <= L/L* <= 0.0002, consistent with collisions in icyplanetesimal belts stirred by Pluto-size dwarf planets.

Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks