Journal article

Measurements of Tropospheric Ice Clouds with a Ground-based CMB Polarization Experiment, POLARBEAR

S Takakura, MAO Aguilar-Faundez, Y Akiba, K Arnold, C Baccigalupi, D Barron, D Beck, F Bianchini, D Boettger, J Borrill, K Cheung, Y Chinone, T Elleflot, J Errard, G Fabbian, C Feng, N Goeckner-Wald, T Hamada, M Hasegawa, M Hazumi Show all

The Astrophysical Journal | American Astronomical Society | Published : 2019

Abstract

The polarization of the atmosphere has been a long-standing concern for ground-based experiments targeting cosmic microwave background (CMB) polarization. Ice crystals in upper tropospheric clouds scatter thermal radiation from the ground and produce a horizontally polarized signal. We report a detailed analysis of the cloud signal using a ground-based CMB experiment, Polarbear, located at the Atacama desert in Chile and observing at 150 GHz. We observe horizontally polarized temporal increases of low-frequency fluctuations ("polarized bursts," hereafter) of ≲0.1 K when clouds appear in a webcam monitoring the telescope and the sky. The hypothesis of no correlation between polarized bursts a..

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University of Melbourne Researchers

Grants

Awarded by National Science Foundation


Awarded by HPCI


Awarded by Office of Science of the U.S. Department of Energy


Awarded by MEXT KAKENHI


Awarded by JSPS KAKENHI


Awarded by CONICYT UC Berkeley-Chile Seed Grant (CLAS fund)


Awarded by Fondecyt


Awarded by RADIOFOREGROUNDS project - European Commission's H2020 Research Infrastructures


Awarded by Australian Research Council Future Fellowship


Awarded by ALMA CONICYT


Awarded by Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy


Awarded by JSPS International Research Fellowship



Funding Acknowledgements

S. Takakura was supported by Grant-in-Aid for JSPS Research Fellow JP14J01662 and JP18J02133. The POLARBEAR project is funded by the National Science Foundation under Grants No. AST-0618398 and No. AST-1212230. The James Ax Observatory operates in the Parque Astronomico Atacama in northern Chile under the auspices of the Comision Nacional de Investigacion Cientifica y Tecnologica de Chile (CONICYT). The APEX PWV was obtained from the APEX Weather Query Form of the ESO Science Archive Facility. This research used resources of the Central Computing System, owned and operated by the Computing Research Center at KEK, the HPCI system (Project ID: hp150132), and the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Kavli IPMU was supported by World Premier International Research Center Initiative (WPI), MEXT, Japan. This work was supported by MEXT KAKENHI grant No. 21111002, JP15H05891, and JP18H05539, JSPS KAKENHI grant No. JP26220709, JP26800125, and JP16K21744, and the JSPS Core-to-Core Program. M.A. acknowledges support from CONICYT UC Berkeley-Chile Seed Grant (CLAS fund) Number 77047, Fondecyt project 1130777 and 1171811, DFI postgraduate scholarship program and DFI Postgraduate Competitive Fund for Support in the Attendance to Scientific Events. C.B., N.K., and D.P. acknowledge support from the RADIOFOREGROUNDS project (radioforegrounds.eu), funded by the European Commission's H2020 Research Infrastructures under the Grant Agreement 687312, the INDARK INFN Initiative and the COSMOS network of the Italian Space Agency (cosmosnet.it). F.B. and C.R. acknowledge support from an Australian Research Council Future Fellowship (FT150100074). D. Boettger gratefully acknowledges support from grant ALMA CONICYT 31140004. G.F. acknowledges the support of the CNES postdoctoral program. Work at LBNL was supported by the Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy Contract No. DE-AC02-05CH11231. A.K. acknowledges the support by JSPS Leading Initiative for Excellent Young Researchers (LEADER). F.M. acknowledges JSPS International Research Fellowship (grant No. JP17F17025).