Paper
6 July 2018 Photometric error in mid-infrared observations at the TAO site caused by short-term variation of atmospheric water vapor
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Abstract
Time variation of the atmospheric water vapor is an important problem to achieve accurate photometry in ground-based mid-infrared observations. Long-term (~ minutes or hours) variation has been already known, but short-term (~ seconds) variation has not been quantified in previous studies. We evaluate this short-term variation and the photometric error in the mid-infrared observations at the TAO site by using actual astronomical data. Estimated photometric errors are typically less than 1% but show 2-5% in two of fifteen cases. This suggests that the short-term variation of the water vapor is one of the factors which limit the photometric accuracy in ground based mid-infrared observations.
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Masahito S. Uchiyama, Takashi Miyata, Ryou Ohsawa, Takafumi Kamizuka, Shigeyuki Sako, Jumpei Yamaguchi, Tomohiro Mori, and Yutaka Yoshida "Photometric error in mid-infrared observations at the TAO site caused by short-term variation of atmospheric water vapor", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022B (6 July 2018); https://doi.org/10.1117/12.2311778
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KEYWORDS
Mid-IR

Transmittance

Telescopes

Astronomy

Photometry

Signal to noise ratio

Error analysis

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