Requirements on bandpass resolution and measurement precision for LiteBIRD

Abstract Systematic effects can hinder the sought-after detection of primordial gravitational waves, impacting the reconstruction of the B -mode polarization signal which they generate in the cosmic microwave background (CMB). In this work, we study the impact of an imperfect knowledge of the instrument bandpasses on the estimate of the tensor-to-scalar ratio r in the context of the next-generation LiteBIRD satellite. We develop a pipeline to integrate over the bandpass transmission in both the time-ordered data (TOD) and the map-making processing steps. We introduce the systematic effect by having a mismatch between the “real”, high resolution bandpass τ , entering the TOD, and the estimated one τ s , used in the map-making. We focus on two aspects: the effect of degrading the τ s resolution, and the addition of a Gaussian error σ to τ s . To reduce the computational load of the analysis, the two effects are explored separately, for three representative LiteBIRD channels (40 GHz, 140 GHz and 402 GHz) and for three bandpass shapes. Computing the amount of bias on r , Δ r , caused by these effects on a single channel, we find that a resolution ≲ 1.5 GHz and σ ≲ 0.0089 do not exceed the LiteBIRD budget allocation per systematic effect, Δ r < 6.5 × 10 -6 . We then check that propagating separately the uncertainties due to a resolution of 1 GHz and a measurement error with σ = 0.0089 in all LiteBIRD frequency channels, for the most pessimistic bandpass shape of the three considered, still produces a Δ r < 6.5 × 10 -6 . This is done both with the simple deprojection approach and with a blind component separation technique, the Needlet Internal Linear Combination (NILC). Due to the effectiveness of NILC in cleaning the systematic residuals, we have tested that the requirement on σ can be relaxed to σ ≲ 0.05.

Authors

Institutions

Publication Details

Journal
Journal of Cosmology and Astroparticle Physics
Published
2025-10-01
DOI
https://doi.org/10.1088/1475-7516/2025/10/038
Citations
1
Primary Topic
Radio Astronomy Observations and Technology
Type
article
Field-Weighted Citation Impact
1.15

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Requirements on bandpass resolution and measurement precision for LiteBIRD

M. Ballardini, Mario de Lucia, Erwan Allys, P. Diego-Palazuelos et al.
1 citations
Journal of Cosmology and Astroparticle Physics
Radio Astronomy Observations and Technology
1.15
article

Requirements on bandpass resolution and measurement precision for LiteBIRD

M. Ballardini, Mario de Lucia, Erwan Allys, P. Diego-Palazuelos, L. T. Hergt, Maresuke Shiraishi, A. J. Banday, C. Leloup, A. Paiella, L. Porcelli, Lionel Clermont, T. Ghigna, S. Matarrese, Kazunori Kohri, E. Di Giorgi, S. Henrot–Versillé, D. Paoletti, V. Sauvage, Debabrata Adak, A. Novelli, J. Sanghavi, K. Cheung, M. Gervasi, M. Ruiz-Granda, Yusuke Takase, A. Occhiuzzi, F. Piacentini, L. Terenzi, F. J. Casas, Ryota Takaku, G. Pascual-Cisneros, L. Pagano, P. Vielva, E. de la Hoz, R.M. Sullivan, A. Carones, S. Micheli, M. López-Caniego, G. Weymann-Despres, Ashish Anand, G. Morgante, S. Masi, A. Coppolecchia, G. Signorelli, A. Gruppuso, Ippei Obata, M. Bersanelli, T. Matsumura, F. Columbro, M. Gerbino, Thejs Brinckmann, M. Bortolami, Giuseppe Puglisi, F. Noviello, M. Tomasi, F. Cuttaia, R. B. Barreiro, Michele Pinchera, M. Galloway, G. Savini, A. Rizzieri, U. Fuskeland, M. Remazeilles, P. de Bernardis, Ryo Nagata, Erminia Calabrese, M. Hazumi, S. Giardiello, Baptiste Jost, J. Aumont, François Levrier, M. Monelli, L. Mousset, L. Vacher, G. Galloni, Edward J. Wollack, G. Polenta, N. Raffuzzi, E. Martínez-González, S. Basak, S. Della Torre, C. Gimeno-Amo, A Besnard, A.I. Lonappan, B. van Tent, I.K. Wehus, M. Tristram, J. Macias-Perez, L. Lamagna, G. Patanchon, M. Migliaccio, L. Montier, N. Bartolo, G. Luzzi, Yu-Feng Zhou, R. T. Génova-Santos, M Citran, V Maranchery
article en
1 citations

Abstract

Abstract Systematic effects can hinder the sought-after detection of primordial gravitational waves, impacting the reconstruction of the B -mode polarization signal which they generate in the cosmic microwave background (CMB). In this work, we study the impact of an imperfect knowledge of the instrument bandpasses on the estimate of the tensor-to-scalar ratio r in the context of the next-generation LiteBIRD satellite. We develop a pipeline to integrate over the bandpass transmission in both the time-ordered data (TOD) and the map-making processing steps. We introduce the systematic effect by having a mismatch between the “real”, high resolution bandpass τ , entering the TOD, and the estimated one τ s , used in the map-making. We focus on two aspects: the effect of degrading the τ s resolution, and the addition of a Gaussian error σ to τ s . To reduce the computational load of the analysis, the two effects are explored separately, for three representative LiteBIRD channels (40 GHz, 140 GHz and 402 GHz) and for three bandpass shapes. Computing the amount of bias on r , Δ r , caused by these effects on a single channel, we find that a resolution ≲ 1.5 GHz and σ ≲ 0.0089 do not exceed the LiteBIRD budget allocation per systematic effect, Δ r < 6.5 × 10 -6 . We then check that propagating separately the uncertainties due to a resolution of 1 GHz and a measurement error with σ = 0.0089 in all LiteBIRD frequency channels, for the most pessimistic bandpass shape of the three considered, still produces a Δ r < 6.5 × 10 -6 . This is done both with the simple deprojection approach and with a blind component separation technique, the Needlet Internal Linear Combination (NILC). Due to the effectiveness of NILC in cleaning the systematic residuals, we have tested that the requirement on σ can be relaxed to σ ≲ 0.05.

Journal of Cosmology and Astroparticle PhysicsVol. 2025(10)
University of Pisa (IT), University of Rome Tor Vergata (IT), Centre National de la Recherche Scientifique (FR), International Computer Science Institute (US), Goddard Space Flight Center (US), Universidad de Cantabria (ES), Université Toulouse III - Paul Sabatier (FR), Scuola Internazionale Superiore di Studi Avanzati (IT), University of Padua (IT), High Energy Accelerator Research Organization (JP), University of British Columbia (CA), University of Trieste (IT), Lawrence Berkeley National Laboratory (US), University of Liège (BE), Universidad de La Laguna (ES), University of San Diego (US), Okayama University (JP), Kavli Institute for the Physics and Mathematics of the Universe (JP), Université Fédérale de Toulouse Midi-Pyrénées (FR), University of Oslo (NO), University of Milan (IT), The Graduate University for Advanced Studies, SOKENDAI (JP), University of Ferrara (IT), Université Paris Cité (FR), Université Paris Sciences et Lettres (FR), Université Paris-Saclay (FR), Agenzia Spaziale Italiana (IT), Japan Aerospace Exploration Agency (JP), Laboratoire AstroParticule et Cosmologie (FR), University of Manchester (GB), École Normale Supérieure - PSL (FR), University of California San Diego (US), University of Catania (IT), Sorbonne Université (FR), University of Oxford (GB), European Space Astronomy Centre (ES), Institut d'Astrophysique Spatiale (FR), Max Planck Institute for Astrophysics (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Delta Institute for Theoretical Physics (NL), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT), Osservatorio Astrofisico di Catania (IT), Instituto de Astrofísica de Canarias (ES), Institut National de Physique Nucléaire et de Physique des Particules (FR), Bologna Research Area (IT), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Institute of Space and Astronautical Science (JP), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Gran Sasso Science Institute (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Instituto de Física de Cantabria (ES), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), Osservatorio Astronomico di Padova (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Suwa Red Cross Hospital (JP), International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles, University College London (GB), Indian Institute of Science Education and Research Thiruvananthapuram (IN), University of Milano-Bicocca (IT), The University of Tokyo (JP), Cardiff University (GB), Ludwig-Maximilians-Universität München (DE), Sapienza University of Rome (IT), National Institute for Astrophysics (IT), Université Grenoble Alpes (FR), Universidad Europea de Madrid (ES), University of California, Berkeley (US), University of Wales (GB)
National Aeronautics and Space Administration, UK Space Agency, European Commission, Deutsche Forschungsgemeinschaft, Abdus Salam International Centre for Theoretical Physics, Ministry of Education, Culture, Sports, Science and Technology, Swedish National Space Agency, Centro para el Desarrollo Tecnológico Industrial, Centre National d’Etudes Spatiales, Nuclear Safety and Security Commission, Vetenskapsrådet, Centre National de la Recherche Scientifique, Istituto Nazionale di Astrofisica, Norges Forskningsråd, Canadian Space Agency, Japan Society for the Promotion of Science, Japan Aerospace Exploration Agency, Agencia Estatal de Investigación, Nuclear Physics
Openalex Percentile: Top 16%
Radio Astronomy Observations and Technology
1.15
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.