In-flight polarization angle calibration for LiteBIRD: Blind challenge and cosmological implications

Krachmalnicoff N, Matsumura T, De La Hoz E, Basak S, Gruppuso A, Minami Y, Baccigalupi C, Komatsu E, Martínez-González E, Vielva P, Aumont J, Aurlien R, Azzoni S, Banday AJ, Barreiro RB, Bartolo N, Bersanelli M, Calabrese E, Carones A, Casas FJ, Cheung K, Chinone Y, Columbro F, De Bernardis P, Diego-Palazuelos P, Errard J, Finelli F, Fuskeland U, Galloway M, Genova-Santos RT, Gerbino M, Ghigna T, Giardiello S, Gjerlow E, Hazumi M, Henrot-Versillé S, Kisner T, Lamagna L, Lattanzi M, Levrier F, Luzzi G, Maino D, Masi S, Migliaccio M, Montier L, Morgante G, Mot B, Nagata R, Nati F, Natoli P, Pagano L, Paiella A, Paoletti D, Patanchon G, Piacentini F, Polenta G, Poletti D, Puglisi G, Remazeilles M, Rubino-Martin J, Sasaki M, Shiraishi M, Signorelli G, Stever S, Tartari A, Tristram M, Tsuji M, Vacher L, Wehus IK, Zannoni M (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 2022

Article Number: 039

Journal Issue: 1

DOI: 10.1088/1475-7516/2022/01/039

Abstract

We present a demonstration of the in-flight polarization angle calibration for the JAXA/ISAS second strategic large class mission, LiteBIRD, and estimate its impact on the measurement of the tensor-to-scalar ratio parameter, r, using simulated data. We generate a set of simulated sky maps with CMB and polarized foreground emission, and inject instrumental noise and polarization angle offsets to the 22 (partially overlapping) LiteBIRD frequency channels. Our in-flight angle calibration relies on nulling the EB cross correlation of the polarized signal in each channel. This calibration step has been carried out by two independent groups with a blind analysis, allowing an accuracy of the order of a few arc-minutes to be reached on the estimate of the angle offsets. Both the corrected and uncorrected multi-frequency maps are propagated through the foreground cleaning step, with the goal of computing clean CMB maps. We employ two component separation algorithms, the Bayesian-Separation of Components and Residuals Estimate Tool (B-SeCRET), and the Needlet Internal Linear Combination (NILC). We find that the recovered CMB maps obtained with algorithms that do not make any assumptions about the foreground properties, such as NILC, are only mildly affected by the angle miscalibration. However, polarization angle offsets strongly bias results obtained with the parametric fitting method. Once the miscalibration angles are corrected by EB nulling prior to the component separation, both component separation algorithms result in an unbiased estimation of the r parameter. While this work is motivated by the conceptual design study for LiteBIRD, its framework can be broadly applied to any CMB polarization experiment. In particular, the combination of simulation plus blind analysis provides a robust forecast by taking into account not only detector sensitivity but also systematic effects.

Authors with CRIS profile

Involved external institutions

Scuola Internazionale Superiore di Studi Avanzati (SISSA) Italy (IT) University of Tokyo Japan (JP) Instituto de Física de Cantabria (IFCA) Spain (ES) Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) India (IN) Université Toulouse III - Paul Sabatier France (FR) University of Padua / Universita degli Studi di Padova Italy (IT) Università degli studi di Milano Italy (IT) Cardiff University United Kingdom (GB) Università degli Studi di Roma 'Tor Vergata' Italy (IT) University of California, Berkeley United States (USA) (US) University of Oslo Norway (NO) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) Università degli Studi di Ferrara Italy (IT) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) Japan Aerospace eXploration Agency (JAXA) Japan (JP) University of Milano-Bicocca / Università degli Studi di Milano-Bicocca, UNIMIB Italy (IT) University of Manchester United Kingdom (GB) Instituto de Astrofísica de Canarias (IAC) Spain (ES) École Polytechnique - Université Paris-Saclay France (FR) Osaka University / 大阪大学 Japan (JP) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) Lawrence Berkeley National Laboratory (LBNL) United States (USA) (US) École Normale Supérieure - PSL (ENS) France (FR) Italian Space Agency / Agenzia Spaziale Italiana (ASI) Italy (IT)

How to cite

APA:

Krachmalnicoff, N., Matsumura, T., De La Hoz, E., Basak, S., Gruppuso, A., Minami, Y.,... Zannoni, M. (2022). In-flight polarization angle calibration for LiteBIRD: Blind challenge and cosmological implications. Journal of Cosmology and Astroparticle Physics, 2022(1). https://doi.org/10.1088/1475-7516/2022/01/039

MLA:

Krachmalnicoff, N., et al. "In-flight polarization angle calibration for LiteBIRD: Blind challenge and cosmological implications." Journal of Cosmology and Astroparticle Physics 2022.1 (2022).

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