The polarisation of HD 189733

Kimberly Bott, Jeremy Bailey, Lucyna Kedziora-Chudczer, Daniel V. Cotton, P. W. Lucas, Jonathan P. Marshall, J. H. Hough

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We present linear polarization observations of the exoplanet system HD 189733 made with the HIgh Precision Polarimetric Instrument (HIPPI) on the Anglo-Australian Telescope (AAT). The observations have higher precision than any previously reported for this object. They do not show the large amplitude polarization variations reported by Berdyugina et al. 2008 and Berdyugina et al. 2011. Our results are consistent with polarization data presented by Wiktorowicz et al. 2015. A formal least squares fit of a Rayleigh-Lambert model yields a polarization amplitude of 29.4 +/- 15.6 parts-per-million. We observe a background constant level of polarization of ~ 55-70 ppm, which is a little higher than expected for interstellar polarization at the distance of HD 189733.
Original languageEnglish
Pages (from-to)109-113
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Early online date20 Mar 2016
Publication statusPublished - 11 Jun 2016


  • polarization
  • techniques: polarimetric
  • planets and satellites: atmospheres
  • planets and satellites: individual: HD 189733b


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