Requirements on bandpass resolution and measurement precision for LiteBIRD

Giardiello, S. 2025. Requirements on bandpass resolution and measurement precision for LiteBIRD. [Online]. arXiv: Cornell University. Available at: https://doi.org/10.48550/arXiv.2506.22217

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Abstract

In this work, we study the impact of an imperfect knowledge of the instrument bandpasses on the estimate of the tensor-to-scalar ratio in the context of the next-generation LiteBIRD satellite. We develop a pipeline to include bandpass integration 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 , entering the TOD, and the estimated one , used in the map-making. We focus on two aspects: the effect of degrading the resolution, and the addition of a Gaussian error to . 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 , , caused by these effects on a single channel, we find that a resolution GHz and do not exceed the LiteBIRD budget allocation per systematic effect, . We then check that propagating separately the uncertainties due to a resolution of 1 GHz and a measurement error with in all LiteBIRD frequency channels, for the most pessimistic bandpass shape of the three considered, still produces a . 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 can be relaxed to . (Abridged)

Item Type:	Website Content
Date Type:	Published Online
Status:	Submitted
Schools:	Schools > Physics and Astronomy
Additional Information:	Full list of authors can be found on the arXiv webpage
Publisher:	Cornell University
Last Modified:	14 Jul 2025 11:00
URI:	https://orca.cardiff.ac.uk/id/eprint/179430

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