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The polarisation of HD 189733

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Original languageEnglish
Number of pages5
Pages (from-to)109-113
JournalMonthly Notices of the Royal Astronomical Society: Letters
Journal publication date11 Jun 2016
Volume459
Issue1
Early online date20 Mar 2016
DOIs
Publication statusPublished - 11 Jun 2016

Abstract

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.

Notes

Kimberly Bott; Jeremy Bailey; Lucyna Kedziora-Chudczer; Daniel V. Votton; P. W. Lucas; Jonathan P. Marshall; J. H. Hough, ‘The polarization of HD 189733’, Monthly Notices of the Royal Astronomical Society/Letters, Vol 459(1): L109-L113, published 20 March 2016, the version of record is available online at doi: https://doi.org/10.1093/mnras/slw046 © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

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