Cool Stars 14 - Submitted Abstract # 93 This version created on 05 October 2006 Search for Cold Debris Disks around M-dwarfs J.-F. Lestrade, Paris M. C. Wyatt, Cambridge, UK F. Bertoldi, Bonn U. W. R. F. Dent, UKATC K. M. Menten, MPI Bonn Debris disks are believed to be related to planetesimals left over around stars after planet formation has ceased. The frequency of debris disks around M-dwarfs which account for 70% of the stars in the Galaxy is unknown while constrains have already been found for A- to K- type stars. We have searched for cold debris disks around 32 field M-dwarfs by conducting observations at lambda = 850 micron with the SCUBA bolometer array camera at the JCMT and at lambda = 1.2mm with the MAMBO array at the IRAM 30-m telescopes. We have detected a new debris disk around an M0.5 dwarf at lambda = 850 micron, providing evidence for cold dust at large distance from this star (~300 AU). By combining the results of our survey with the ones of Liu et al. (2004), we estimate for the first time the frequency of cold debris disks around field M-dwarfs with ages between 20 and 200~Myr. This frequency is 7 - 21 % in our sample and is consistent with the frequency of cold debris disks (9 - 23 %) around A- to K-type main sequence stars of the same age. This is an indication that cold disks may be equally prevalent across stellar spectral types. ----------------------------------