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

Lecavelier des Etangs, A. ; Sirothia, S. K. ; Gopal-Krishna, ; Zarka, P. (2009) GMRT radio observations of the transiting extrasolar planet HD 189733 b at 244 and 614 MHz Astronomy & Astrophysics, 500 (3). L51-L54. ISSN 0004-6361

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Official URL: http://www.aanda.org/index.php?option=com_article&...

Related URL: http://dx.doi.org/10.1051/0004-6361/200912347

Abstract

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 (3σ) upper limits of 2 mJy at 244 MHz and 160 µJy 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.

Item Type:Article
Source:Copyright of this article belongs to EDP Sciences.
Keywords:Stars: Planetary Systems; Stars: Individual: HD 189733; Techniques: Interferometric
ID Code:76585
Deposited On:04 Jan 2012 07:18
Last Modified:06 Jan 2012 03:44

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