A high-sensitivity polarimeter using a ferro-electric liquid crystal modulator

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

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Abstract

We describe the HIgh Precision Polarimetric Instrument (HIPPI), a polarimeter built at UNSW (The University of New South Wales) Australia and used on the Anglo-Australian Telescope (AAT). HIPPI is an aperture polarimeter using a ferro-electric liquid crystal modulator. HIPPI measures the linear polarization of starlight with a sensitivity in fractional polarization of ∼4 × 10−6 on low-polarization objects and a precision of better than 0.01 per cent on highly polarized stars. The detectors have a high dynamic range allowing observations of the brightest stars in the sky as well as much fainter objects. The telescope polarization of the AAT is found to be 48 ± 5 × 10−6 in the g′ band
Original languageEnglish
Pages (from-to)3064-3073
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume449
Issue number3
Early online date9 Apr 2015
DOIs
Publication statusPublished - 21 May 2015

Keywords

  • polarization, instrumentation: polarimeters, techniques: polarimetric

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