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Secondary radio eclipse of the transiting planet HD 189733 b: an upper limit at 307–347 MHz
Article first published online: 17 MAR 2009
DOI: 10.1111/j.1365-2966.2009.14510.x
© 2009 The Authors. Journal compilation © 2009 RAS
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How to Cite
Smith, A. M. S., Cameron, A. C., Greaves, J., Jardine, M., Langston, G. and Backer, D. (2009), Secondary radio eclipse of the transiting planet HD 189733 b: an upper limit at 307–347 MHz. Monthly Notices of the Royal Astronomical Society, 395: 335–341. doi: 10.1111/j.1365-2966.2009.14510.x
Publication History
- Issue published online: 9 APR 2009
- Article first published online: 17 MAR 2009
- Accepted 2009 January 15. Received 2009 January 13; in original form 2008 September 15
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Keywords:
- masers;
- stars: magnetic fields;
- planetary systems;
- radio continuum: stars
ABSTRACT
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.