Observations from the Herschel Space Observatory have more than doubled the number of wide debris disks orbiting Sunlike stars to include over 30 systems with R > 100 AU .
Here we present new Herschel PACS and re-analyzed Spitzer MIPS photometry of five Sunlike stars with wide debris disks , from Kuiper belt size to R > 150 AU .
The disk surrounding HD 105211 is well resolved , with an angular extent of > 14 \arcsec along the major axis , and the disks of HD 33636 , HD 50554 , and HD 52265 are extended beyond the PACS PSF size ( 50 % of energy enclosed within radius 4 \farcs 23 ) .
HD 105211 also has a 24 \micron infrared excess that was previously overlooked because of a poorly constrained photospheric model .
Archival Spitzer IRS observations indicate that the disks have small grains of minimum radius a _ { min } \sim 3 \micron , though a _ { min } is larger than the radiation pressure blowout size in all systems .
If modeled as single-temperature blackbodies , the disk temperatures would all be < 60 K. Our radiative transfer models predict actual disk radii approximately twice the radius of a model blackbody disk .
We find that the Herschel photometry traces dust near the source population of planetesimals .
The disk luminosities are in the range 2 \times 10 ^ { -5 } \leq L / L _ { \odot } \leq 2 \times 10 ^ { -4 } , consistent with collisions in icy planetesimal belts stirred by Pluto-size dwarf planets .