Search for Radio Emissions from Extrasolar Planets: The Observation Campaign

Details Search for Radio Emissions from Extrasolar Planets: The Observation Campaign Search for Radio Emissions from Extrasolar Planets: The Observation Campaign

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusm.p21e..01w&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #P21E-01

Astronomy and Astrophysics

Astronomy

2784 Solar Wind/Magnetosphere Interactions, 6954 Radio Astronomy, 7534 Radio Emissions

Scientific paper

Non-thermal, low-frequency radio emissions have been observed for decades from planets in our solar system, and they are also expected from the magnetospheres of extrasolar planets. Particularly from "Hot Jupiters", extrasolar planets of Jupiter size that orbit their primary at very close range (<0.1 AU in some cases), we expect the radiated power to be strong enough to allow detection from Earth. This is because the energy input into a magnetosphere so close to a star is orders of magnitude larger than that experienced by our own Jupiter. Using the new 150 MHz receivers of the Giant Metrewave Radiotelescope (GMRT) in India, we have searched for radio emissions from a sub-set of known "hot Jupiters". We have selected three primary and two backup targets, based on the expected flux density and the level of background noise. No observation of these targets has been attempted previously at these frequencies with the sensitivity and aperture offered by GMRT. Calibrations with GMRT at 150 MHz have confirmed the noise floor to be 2 mJy over a 5 MHz bandwidth. The noise floor is well below the expected flux levels from the targets. Our search strategy included a focus on those planetary emissions that may be caused by impulsive events on the primary star. For this reason, the target primaries where monitored for impulsive events with near-simulatenous optical observations. This paper will describe the campaign, and present the preliminary results.

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