Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2011-08-18
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
To be published in Astronomy & Astrophysics
Scientific paper
We report a sensitive search for meter-wavelength emission at 150 MHz from two prominent transiting extrasolar planets, HD189733b and HD209458b. To distinguish any planetary emission from possible stellar or background contributions, we monitored these systems just prior to, during, and after the planet's eclipse behind the host star. No emission was detected from HD209458b with a 3-sigma upper limit of 3.6 mJy. For HD189733b we obtain a 3-sigma upper limit of 2.1 mJy and a marginal 2.7-sigma detection of about 1.9+/-0.7 mJy from a direction just 13" from the star's coordinates (i.e., within the beam), but its association with the planet remains unconfirmed. Thus, the present GMRT observations provide unprecedentedly tight upper limits for meter wavelengths emissions from these nearest two transiting type exoplanets. We point out possible explanations of the non-detections and briefly discuss the resulting constraints on these systems.
des Etangs Alain Lecavelier
Gopal-Krishna
Sirothia S. K.
Zarka Ph.
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