GMU Space Sciences Seminar

February 23, 2005

Dr. Joseph Lazio
Naval Research Laboratory

"Radio Detection of Extrasolar Planets: Present and Future Prospects"

TALK ABSTRACT:
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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.