February 23, 2005
Dr. Joseph Lazio
Naval Research Laboratory
"Radio Detection of Extrasolar Planets: Present and Future Prospects"
TALK ABSTRACT: -------------- By virtue of their planetary-scale magnetic fields, the Earth and all of the gas giants in our solar system possess solar-wind deformed magnetospheres. The magnetic polar regions of these "magnetic planets" produce intense, auora-related radio emission from solar-wind powered electron currents. I describe a combined theoretical and observational program designed to test the extent to which auroral radio emission from the known extrasolar planets may be detectable over interstellar distances. Various forms of a radiometric Bode's Law have been developed to describe the dependence of auroral radio emission upon a planet's distance from the Sun and its magnetic moment. A typical form of the radiometric Bode's Law has been applied to the current census of extrasolar planets. I find that the auroral radio emission of some of the known extrasolar planets may be within reach of current radio telescopes, under favorable conditions, and should definitely be detectable by future instruments. I am also conducting a systematic effort to search for radio emission in low radio frequency images acquired with the VLA. The current limits set by the VLA are approaching, but do not yet provide strong constraints on, the predictions of the model.