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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2009

GMRT radio observations of the transiting extrasolar planet HD 189733 b at 244 and 614 MHz

Résumé

We report a sensitive search for meter-wavelength emission at 244 and 614 MHz from HD 189733 b, the nearest known extrasolar transiting planet of ``hot-Jupiter'' type. To discriminate any planetary emission from possible stellar or background contributions, we observed the system for 7.7 h encompassing the planet's eclipse behind the host star. These GMRT observations provide very low (3sigma) upper limits of 2 mJy at 244 MHz and 160 muJy at 614 MHz. These limits are, respectively, about 40 and 500 times deeper than those reported recently at a nearby frequency of 340 MHz. Possible explanations of our non-detection include: (1) the Earth being outside the planet's emission beam; (2) its highly variable emission with more rapid flaring than the temporal sampling in our observations; (3) the planetary emission being intrinsically too weak; or more likely; (4) the emission being predominantly at lower frequencies because of a weak planetary magnetic field. We briefly discuss these possibilities and the constraints on this exo-planetary system environment.

Dates et versions

hal-03729643 , version 1 (20-07-2022)

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Alain Lecavelier Des Etangs, S. K. Sirothia, Philippe Zarka. GMRT radio observations of the transiting extrasolar planet HD 189733 b at 244 and 614 MHz. Astronomy and Astrophysics - A&A, 2009, 500, pp.L51-L54. ⟨10.1051/0004-6361/200912347⟩. ⟨hal-03729643⟩
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