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We present IRAC/MIPS Spitzer Space Telescope observations of the solar typeand the low mass stellar population of the young (~5 Myr) Lambda Orioniscluster. Combining optical and 2MASS photometry, we identify 436 stars asprobable members of the cluster. Given the distance (450 pc) and the age of thecluster, our sample ranges in mass from 2 solar mass to objects below thesubstellar limit. With the addition of the Spitzer mid-infrared data, we haveidentified 49 stars bearing disks in the stellar cluster. Using spectral energydistribution (SED) slopes, we place objects in several classes: non-excessstars (diskless), stars with optically thick disks, stars with ``evolveddisks''( with smaller excesses than optically thick disk systems), and``transitional disks'' candidates (in which the inner disk is partially orfully cleared). The disk fraction depends on the stellar mass, ranging from ~6%for K type stars (Rc-J<2) to ~27% for stars with spectral type M5 or later(Rc-J>4). We confirm the dependence of disk fraction on stellar mass in thisage range found in other studies. Regarding clustering levels, the overallfraction of disks in the Lambda Orionis cluster is similar to those reported inother stellar groups with ages normally quoted as ~5 Myr.

Spitzer Observations of the Lambda Orionis cluster. II. Disks around solar-type and low mass stars