Search for radio extrasolar planets with LOFAR

Details Search for radio extrasolar planets with LOFAR Search for radio extrasolar planets with LOFAR

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13085z&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13085

Physics

Scientific paper

Magnetized extrasolar planets are expected to possess intense magnetospheric radio emissions similar to Jupiter's decameter ones. These emissions are as intense as solar radio bursts. The decameter range provides thus the best contrast between stellar and planetary electromagnetic emissions. Although the most intense jovian radio bursts would be detectable by LOFAR from a distance of no more that about one parsec, because of the bright galactic background, it has been proposed that planetary radio emissions may be much more intense than Jupiter's ones in specific conditions. These include magnetized "hot Jupiters" (massive planets orbiting very close to their parent star), and unmagnetized planets orbiting close to a strongly magnetized star. We have predicted that the radio emission could reach 1000 to 100,000 times that of Jupiter, making it detectable from tens of parsecs range. Although it will not be possible to image the planet, and not even to resolve it from its parent star, circular polarization measurements will allow to distinguish the planet's emission from the stellar one. Detection of exoplanetary radio emissions would bring information on the planet's rotation period, magnetic field moment, and allow to extend comparative magnetospheric physics to a totally new range of physical conditions. The future Low Frequency Array (LOFAR) should allow the detection and monitoring of nonthermal radio emission from extrasolar planets' magnetospheres. Instrumental constraints are outlined.

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