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We describe new, deep MIPS photometry and new high signal-to-noise opticalspectroscopy of the 2.5 Myr-old IC 348 Nebula. To probe the properties of theIC 348 disk population, we combine these data with previous optical/infraredphotometry and spectroscopy to identify stars with gas accretion, to examinetheir mid-IR colors,and to model their spectral energy distributions. IC 348contains many sources in different evolutionary states, including protostarsand stars surrounded by primordial disks, two kinds of transitional disks, anddebris disks. Most disks surrounding eary/intermediate spectral-type stars (>1.4 Msun at 2.5 Myr) are debris disks; most disks surrounding solar andsubsolar-mass stars are primordial disks. At the 1--2 sigma level, more massivestars also have a smaller frequency of gas accretion and smaller mid-IRluminosities than lower-mass stars. These trends are suggestive of a stellarmass-dependent evolution of disks, where most disks aroundhigh/intermediate-mass stars shed their primordial disks on rapid, 2.5 Myrtimescales. The frequency of MIPS-detected transitional disks is ~ 15--35% forstars plausibly more massive than 0.5 Msun. The relative frequency oftransitional disks in IC 348 compared to that for 1 Myr-old Taurus and 5Myr-old NGC 2362 is consistent with a transition timescale that is asignificant fraction of the total primordial disk lifetime.

the astronomical journal

Deep MIPS Observations of the IC 348 Nebula: Constraints on the  Evolutionary State of Anemic Circumstellar Disks and the Primordial-to-Debris  Disk Transition