9 August 2016 An optical design of the wide-field imaging and multi-object spectrograph for an Antarctic infrared telescope
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Abstract
A design of the wide-field infrared camera (AIRC) for Antarctic 2.5m infrared telescope (AIRT) is presented. The off-axis design provides a 7’.5 ×7’. 5 field of view with 0”.22 pixel-1 in the wavelength range of 1 to 5 μm for the simultaneous three-color bands using cooled optics and three 2048×2048 InSb focal plane arrays. Good image quality is obtained over the entire field of view with practically no chromatic aberration. The image size corresponds to the refraction limited for 2.5 m telescope at 2 μm and longer. To enjoy the stable atmosphere with extremely low perceptible water vapor (PWV), superb seeing quality, and the cadence of the polar winter at Dome Fuji on the Antarctic plateau, the camera will be dedicated to the transit observations of exoplanets. The function of a multi-object spectroscopic mode with low spectra resolution (R~50-100) will be added for the spectroscopic transit observation at 1-5 μm. The spectroscopic capability in the environment of extremely low PWV of Antarctica will be very effective for the study of the existence of water vapor in the atmosphere of super earths.
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Takashi Ichikawa, Tomokazu Obata, "An optical design of the wide-field imaging and multi-object spectrograph for an Antarctic infrared telescope", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99083J (9 August 2016); doi: 10.1117/12.2230486; https://doi.org/10.1117/12.2230486
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