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Article Dans Une Revue Astron.Astrophys. Année : 2022

Detailed study of HWP non-idealities and their impact on future measurements of CMB polarization anisotropies from space

Serena Giardiello
  • Fonction : Auteur
Martina Gerbino
  • Fonction : Auteur
Luca Pagano
  • Fonction : Auteur
Alessandro Gruppuso
  • Fonction : Auteur
Hirokazu Ishino
  • Fonction : Auteur
Massimiliano Lattanzi
  • Fonction : Auteur
Paolo Natoli
  • Fonction : Auteur
Francesco Piacentini
  • Fonction : Auteur
Giampaolo Pisano
  • Fonction : Auteur

Résumé

We study the propagation of a specific class of instrumental systematics to the reconstruction of the B-mode power spectrum of the cosmic microwave background (CMB). We focus on the non-idealities of the half-wave plate (HWP), a polarization modulator that is to be deployed by future CMB experiments, such as the phase-A satellite mission LiteBIRD. We study the effects of non-ideal HWP properties, such as transmittance, phase shift, and cross-polarization. To this end, we developed a simple, yet stand-alone end-to-end simulation pipeline adapted to LiteBIRD. We analyzed the effects of a possible mismatch between the measured frequency profiles of HWP properties (used in the mapmaking stage of the pipeline) and the actual profiles (used in the sky-scanning step). We simulated single-frequency, CMB-only observations to emphasize the effects of non-idealities on the BB power spectrum. We also considered multi-frequency observations to account for the frequency dependence of HWP properties and the contribution of foreground emission. We quantified the systematic effects in terms of a bias Δr on the tensor-to-scalar ratio, r, with respect to the ideal case without systematic effects. We derived the accuracy requirements on the measurements of HWP properties by requiring Δr < 10−5 (1% of the expected LiteBIRD sensitivity on r). Our analysis is introduced by a detailed presentation of the mathematical formalism employed in this work, including the use of the Jones and Mueller matrix representations.Key words: cosmic background radiation / instrumentation: polarimeters / cosmology: observations / techniques: polarimetric

Dates et versions

hal-03273386 , version 1 (29-06-2021)

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Citer

Serena Giardiello, Martina Gerbino, Luca Pagano, Josquin Errard, Alessandro Gruppuso, et al.. Detailed study of HWP non-idealities and their impact on future measurements of CMB polarization anisotropies from space. Astron.Astrophys., 2022, 658, pp.A15. ⟨10.1051/0004-6361/202141619⟩. ⟨hal-03273386⟩
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