  (abbreviated) We report detection with the Spitzer Space Telescope of cool
dust surrounding solar type stars. The observations were performed as part of
the Legacy Science Program, ``Formation and Evolution of Planetary Systems''
(FEPS). From the overall FEPS sample (Meyer et al. 2006) of 328 stars having
ages ~0.003-3 Gyr we have selected sources with 70 um flux densities indicating
excess in their spectral energy distributions above expected photospheric
emission........ .....The rising spectral energy distributions towards - and
perhaps beyond - 70 um imply dust temperatures T_dust <45-85 K for debris in
equilibrium with the stellar radiation field. We infer bulk properties such as
characteristic temperature, location, fractional luminosity, and mass of the
dust from fitted single temperature blackbody models. For >1/3 of the debris
sources we find that multiple temperature components are suggested, implying a
spatial distribution of dust extending over many tens of AU. Because the disks
are dominated by collisional processes, the parent body (planetesimal) belts
may be extended as well. Preliminary assessment of the statistics of cold
debris around sun-like stars shows that ~10% of FEPS targets with masses
between 0.6 and 1.8 Msun and ages between 30 Myr and 3 Gyr exhibit 70 um
emission in excess of the expected photospheric flux density. We find that
fractional excess amplitudes appear higher for younger stars and that there may
be a trend in 70 um excess frequency with stellar mass.
