We have searched for infrared excesses around a well defined sample of 69 FGK main-sequence field stars .
These stars were selected without regard to their age , metallicity , or any previous detection of IR excess ; they have a median age of \sim 4 Gyr .
We have detected 70 µm excesses around 7 stars at the 3- \sigma confidence level .
This extra emission is produced by cool material ( < 100 K ) located beyond 10 AU , well outside the “ habitable zones ” of these systems and consistent with the presence of Kuiper Belt analogs with \sim 100 times more emitting surface area than in our own planetary system .
Only one star , HD 69830 , shows excess emission at 24 µm , corresponding to dust with temperatures \lower 3.0 pt \hbox { $ { \buildrel > \over { \sim } } $ } 300 K located inside of 1 AU .
While debris disks with L _ { dust } / L _ { \star } \geq 10 ^ { -3 } are rare around old FGK stars , we find that the disk frequency increases from 2 \pm 2 % for L _ { dust } / L _ { \star } \geq 10 ^ { -4 } to 12 \pm 5 % for L _ { dust } / L _ { \star } \geq 10 ^ { -5 } .
This trend in the disk luminosity distribution is consistent with the estimated dust in our solar system being within an order of magnitude , greater or less , than the typical level around similar nearby stars .