Journal Article

Secondary radio eclipse of the transiting planet HD 189733 b: an upper limit at 307–347 MHz

A. M. S. Smith, A. Collier Cameron, J. Greaves, M. Jardine, G. Langston and D. Backer

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 1, pages 335-341
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14510.x
Secondary radio eclipse of the transiting planet HD 189733 b: an upper limit at 307–347 MHz

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We report the first attempt to observe the secondary eclipse of a transiting extra-solar planet at radio wavelengths. We observed HD 189733 b with the Robert C. Byrd Green Bank Telescope of the National Radio Astronomy Observatory (NRAO) over about 5.5 h before, during and after secondary eclipse, at frequencies of 307–347 MHz. In this frequency range, we determine the 3σ upper limit to the flux density to be 81 mJy. The data are consistent with no eclipse or a marginal reduction in flux at the time of secondary eclipse in all subsets of our bandwidth; the strongest signal is an apparent eclipse at the 2σ level in the 335.2–339.3 MHz region. Our observed upper limit is close to theoretical predictions of the flux density of cyclotron-maser radiation from the planet.

Keywords: masers; stars: magnetic fields; planetary systems; radio continuum: stars

Journal Article.  3649 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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