Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-06-15
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
Accepted for publication in A&A letters
Scientific paper
We report a sensitive search for meter-wavelength emission at 244 and 614 MHz from HD189733b, 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 hours encompassing the planet's eclipse behind the host star. These GMRT observations provide very low (3 sigma) upper limits of 2 mJy at 244 MHz and 160 micro-Jy 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.
des Etangs Alain Lecavelier
Gopal-Krishna
Sirothia S. K.
Zarka Ph.
No associations
LandOfFree
GMRT radio observations of the transiting extrasolar planet HD189733b at 244 and 614 MHz does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with GMRT radio observations of the transiting extrasolar planet HD189733b at 244 and 614 MHz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GMRT radio observations of the transiting extrasolar planet HD189733b at 244 and 614 MHz will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-475001