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Millimeter emission from debris disks around stars of different ages providesconstraints on the collisional evolution of planetesimals. We present ALMA 1.3millimeter observations of a sample of 76 Solar-type stars in the ~115 Myr oldPleiades star cluster. These ALMA observations complement previous infraredobservations of this sample by providing sensitivity to emission fromcircumstellar dust at lower temperatures, corresponding to debris at radiicomparable to the Kuiper Belt and beyond. The observations obtain a beam sizeof 1.5 arcsec (200 au) and a median rms noise of 54 mircoJy/beam, whichcorresponds to a fractional luminosity $L_{dust}/L_{star} \sim 10^{-4}$ for 40K dust for a typical star in the sample. The ALMA images show no significantdetections of the targeted stars. We interpret these limits in the context of asteady-state collisional cascade model for debris disk evolution that providesa good description of observations of the field population near the Sun but isnot well-calibrated on younger populations.The ALMA non-detections of thePleiades systems are compatible with the disk flux predictions of this model.We find no high fractional luminosity outliers from these ALMA data that couldbe associated with enhanced collisions resulting from activity not accountedfor by steady-state evolution. However, we note that two systems (HII 1132 andHD 22680) show 24 micron excess much higher than the predictions of this model,perhaps due to unusually high dust production from dynamical events involvingplanets.

An ALMA 1.3 millimeter Search for Debris Disks around Solar-type Stars in the Pleiades