Optical and Radio Searches on Dyson Sphere Candidates

A search for advanced civilizations exploiting Dyson Sphere type technology, that is the employment of shells around stars to extract solar energy. Partial Dyson Spheres are theorized to radiate waste heat. The infrared excess is gone by 60 micrometers, indicating that the excess is intrinsic to the system and not to systematic error. 33 Dyson Sphere candidates with excess 12 micron radiation no 60 micron excess ages greater than a gigayear were observed for SETI signals with the Leuschner Optical Telescope, SERENDIP IV at Arecibo and the SETI@home program. Stars were observed with measured ages of above 10^{9 years, such that there is no protoplanetary disk, a known source of infrared radiation. This search is significant enough to warrant further investigation. [Data were taken with OSETI pulse detection system at Leuschner, and SERENDIP IV and SETI@home systems at Arecibo Observatory]}