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We present infrared observations in search of a planet around the whitedwarf, GD66. Time-series photometry of GD66 shows a variation in the arrivaltime of stellar pulsations consistent with the presence of a planet with mass >2.4Mj. Any such planet is too close to the star to be resolved, but theplanet's light can be directly detected as an excess flux at 4.5um. We observedGD66 with the two shorter wavelength channels of IRAC on Spitzer but did notfind strong evidence of a companion, placing an upper limit of 5--7Mj on themass of the companion, assuming an age of 1.2--1.7Gyr.

Spitzer Planet Limits around the Pulsating White Dwarf GD66