Data Reduction Process and Pipeline for the NIC Polarimetry Mode in Python, NICpolpy

Yoonsoo P. Bach, Masateru Ishiguro, Jun Takahashi, Jooyeon Geem
12/29/2022
astro-ph.IM

Official code: ysBach/NICpolpy (1 star, BSD-3-Clause, last commit 2025-01-23).

Abstract

A systematic way of data reduction for the Nishiharima Infrared Camera (NIC) polarimetry mode has been devised and implemented to an open software called NICpolpy in the programming language python (tested on version 3.8--3.10 as of writing). On top of the classical methods, including vertical pattern removal, a new way of diagonal pattern (Fourier pattern) removal has been implemented. Each image undergoes four reduction steps, resulting in "level 1" to "level 4" products, as well as nightly calibration frames. A simple tutorial and in-depth descriptions are provided, as well as the descriptions of algorithms. The dome flat frames (taken on UT 2020-06-03) were analyzed, and the pixel positions vulnerable to flat error were found. Using the dark and flat frames, the detector parameters, gain factor (the conversion factor), and readout noise are also updated. We found gain factor and readout noise are likely constants over pixel or "quadrant".

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Code Implementations(1)

ysBach/NICpolpyOfficial100%
BSD-3-Clause

Nishi Harima Astronomical Observatory (NHAO)'s Nishiharima-Infrared Camera (NIC) Polarimetry photometry pipeline.

11PythonNov 4, 20191 years agoBSD-3-Clause
astronomydata-reductionimage-processingnear-infraredpolarimetry+1 more

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Cite this paper

@article{bach2022data,
  title  = {Data Reduction Process and Pipeline for the NIC Polarimetry Mode in Python, NICpolpy},
  author = {Yoonsoo P. Bach and Masateru Ishiguro and Jun Takahashi and Jooyeon Geem},
  year   = {2022},
  eprint = {2212.14167},
  archivePrefix = {arXiv},
  url    = {https://arxiv.org/abs/2212.14167}
}

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