PlanetPol : A very high sensitivity polarimeter

Hough, J.H., Lucas, P.W., Bailey, J.A., Tamura, M., Hirst, E., Harrison, D. and Bartholomew-Biggs, M. (2006) PlanetPol : A very high sensitivity polarimeter. Publications of the Astronomical Society of the Pacific (847). pp. 1302-1318. ISSN 0004-6280
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We have built and used on several occasions an optical broadband stellar polarimeter, PlanetPol, which employs photoelastic modulators and avalanche photodiodes and achieves a photon-noise-limited sensitivity of at least l in 106 in fractional polarization. Observations of a number of polarized standards taken from the literature show that the accuracy of polarization measurements is ∼1%. We have developed a method for accurately measuring the polarization of altitude-azimuth mounted telescopes by observing bright nearby stars at different parallactic angles, and we find that the on-axis polarization of the William Herschel Telescope is typically -15 × 10 , measured with an accuracy of a few parts in 10 . The nearby stars (distance less than 32 pc) are found to have very low polarizations, typically a few × 10 , indicating that very little interstellar polarization is produced close to the Sun and that their intrinsic polarization is also low. Although the polarimeter can be used for a wide range of astronomy, the very high sensitivity was set by the goal of detecting the polarization signature of unresolved extrasolar planets.

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