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Since giant planets scatter planetesimals within a few tidal radii of theirorbits, the locations of existing planetesimal belts indicate regions wheregiant planet formation failed in bygone protostellar disks. Infraredobservations of circumstellar dust produced by colliding planetesimals aretherefore powerful probes of the formation histories of known planets. Here wepresent new Spitzer IRS spectrophotometry of 111 Solar-type stars, including105 planet hosts. Our observations reveal 11 debris disks, including twopreviously undetected debris disks orbiting HD 108874 and HD 130322. Combiningour 32 micron spectrophotometry with previously published MIPS photometry, wefind that the majority of debris disks around planet hosts have temperatures inthe range 60 < T < 100 K. Assuming a dust temperature T = 70 K, which isrepresentative of the nine debris disks detected by both IRS and MIPS, we findthat debris rings surrounding Sunlike stars orbit between 15 and 240 AU,depending on the mean particle size. Our observations imply that the planetsdetected by radial-velocity searches formed within 240 AU of their parentstars. If any of the debris disks studied here have mostly large, blackbodyemitting grains, their companion giant planets must have formed in a narrowregion between the ice line and 15 AU.

A Spitzer IRS Study of Debris Disks Around Planet-Host Stars