Title:

Results from the FEPS Spitzer Legacy Program



John Carpenter
Caltech



Abstract:

FEPS (Formation and Evolution of Planetary Systems) is a Spitzer Legacy 
Program designed to trace the evolution of circumstellar disks around 
solar-type stars. The FEPS sample consists of 314 stars that span the age 
range from 3 Myr when accretion from a primordial disk terminates, to 3 Gyr 
when many stars are surrounded by mature planetary systems. IRAC/MIPS 
photometry and IRS low resolution spectra have been obtained for each star
to measure the spectral energy distribution between 3.6 and 70 microns and 
identify sources with infrared excesses diagnostic of circumstellar disks. 
I will present recent results from FEPS and compare the observations with 
simple models for the evolution of planetesimal belts.