EDP Sciences
Free access
Volume 405, Number 1, July I 2003
Page(s) 349 - 366
Section Physical and chemical processes
DOI http://dx.doi.org/10.1051/0004-6361:20030467

A&A 405, 349-366 (2003)
DOI: 10.1051/0004-6361:20030467

Systematic effects in the measurement of polarization by the PLANCK telescope

G. Franco1, P. Fosalba1, 2 and J. A. Tauber1

1  Research and Science Support Department of ESA, ESTEC, PO Box 299, 2200 AG Noordwijk, The Netherlands
2  Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France

(Received 2 October 2002 / Accepted 6 March 2003)

We present estimates of the response to polarized signals by the PLANCK telescope. These estimates are based on a set of simulations, using a physical optics code (GRASP8), for linearly polarized detectors at different frequencies and located in different positions of an early design of the PLANCK focal plane. We show how the optical aberration introduced by the studied focal plane configuration affects absolute and relative orientation of the sky signals polarization planes. In addition, we compute the spurious signal introduced by the telescope optics into a PLANCK-type measurement of the sky polarization. Our analysis shows that the spurious polarization expected in a PLANCK-like experiment is typically of the order of $0.2\%$ of the unpolarized intensity.

Key words: space vehicles: instruments -- telescopes -- polarization -- cosmology: cosmic microwave background -- space vehicles

Offprint request: P. Fosalba, fosalba@iap.fr

© ESO 2003