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Since the radio-frequency emission from planets is expected to be stronglyinfluenced by their interaction with the magnetic field and corona of the hoststar, the physics of this process can be effectively constrained by makingsensitive measurements of the planetary radio emission. Up to now, however,numerous searches for radio emission from extrasolar planets at radiowavelengths have only yielded negative results. Here we report deep radioobservations of the nearby Neptune-mass extrasolar transiting planet HAT-P-11bat 150 MHz, using the Giant Meterwave Radio Telescope (GMRT). On July 16, 2009,we detected a 3-sigma emission whose light curve is consistent with an eclipsewhen the planet passed behind the star. This emission is at a position 14arcsec from the transiting exoplanet's coordinates; thus, with a synthetizedbeam of FWHM~16 arcsec, the position uncertainty of this weak radio signalencompasses the location of HAT-P-11. We estimate a 5% false positiveprobability that the observed radio light curve mimics the planet's eclipselight curve. If the faint signature is indeed a radio eclipse event associatedwith the planet, then its flux would be 3.87 mJy +/- 1.29 mJy at 150 MHz.However, our equally sensitive repeat observations of the system on November17, 2010 did not detect a significant signal in the radio light curve near thesame position. This lack of confirmation leaves us with the possibility ofeither a variable planetary emission, or a chance occurrence of a falsepositive signal in our first observation. Deeper observations are required toconfirm this hint of 150 MHz radio emission from HAT-P-11b.

Hint of 150 MHz radio emission from the Neptune-mass extrasolar transiting planet HAT-P-11b