Abstract
The Polarized Instrument for Long-wavelength Observation of the Tenuous interstellar medium (PILOT) is a balloon-borne experiment that aims to measure the polarized emission of thermal dust at a wavelength of 240µm (1.2 THz). The PILOT experiment flew from Timmins, Ontario, Canada in 2015 and 2019 and from Alice Springs, Australia in April 2017. The in-flight performance of the instrument during the second flight was described in [1]. In this paper, we present data processing steps that were not presented in [1] and that we have recently implemented to correct for several remaining instrumental effects. The additional data processing concerns corrections related to detector cross-talk and readout circuit memory effects, and leakage from total intensity to polarization. We illustrate the above effects and the performance of our corrections using data obtained during the third flight of PILOT, but the methods used to assess the impact of these effects on the final science-ready data, and our strategies for correcting them will be applied to all PILOT data. We show that the above corrections, and in particular that for the intensity to polarization leakage, which is most critical for accurate polarization measurements with PILOT, are accurate to better than 0.4% as measured on Jupiter during flight#3.
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Acknowledgements
PILOT is an international project that involves several European institutes. The institutes that have contributed to hardware developments for PILOT are IRAP and CNES in Toulouse (France), IAS in Orsay (France), CEA in Saclay (France), Sapienza University in Rome (Italy), Cardiff University (UK) and the Scientific Support Office at ESTEC (NL). This work was supported by the CNES. It is based on the PILOT data obtained during three flight campaigns operated by CNES, under the agreement between CNES and CNRS / INSU. It benefited from the active participation of CNES, IRAP, IAS, CEA and ESTEC to the flight campaigns.
Funding
In France, this work was supported by the CNES and by the Programme National “Physique et Chimie du Milieu Interstellaire” (PCMI) of CNRS / INSU with INC/INP co-funded by CEA and CNES. DA acknowledges SC MES RK grant No. AP08855858 and Nazarbayev University Grant Programme No. 110119FD4503. In Japan, this work was supported by World Premier International Research Center Initiative (WPI), MEXT.
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Adam Bernard, Hélène Roussel, Ilyes Choubani, Dana Alina, Jonathan Aumont, Annie Hughes, Isabelle Ristorcelli, Samantha Stever, Tomotake Matsumura, Shinya Sugiyama, Kunimoto Komatsu, Giancarlo de Gasperis, Katia Ferrière, Vincent Guillet, Nathalie Ysard, Peter Ade, Paolo de Bernardis, Nicolas Bray, Bruno Crane, Jean-Pierre Dubois, Matt Griffin, Peter Hargrave, Yuying Longval, Stephane Louvel, Bruno Maffei, Silvia Masi, Baptiste Mot, Johan Montel, François Pajot, Etienne Pérot, Nicolas Ponthieu, Louis Rodriguez, Valentin Sauvage, Giorgio Savini, Carole Tucker and François Vacher contributed equally to this work.
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Bernard, JP., Bernard, A., Roussel, H. et al. Performance of the polarization leakage correction in the PILOT data. Exp Astron 56, 197–222 (2023). https://doi.org/10.1007/s10686-022-09882-5
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DOI: https://doi.org/10.1007/s10686-022-09882-5