Mr. Kota Ogihara Profile

Kota Ogihara

at Nagoya Univ.

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Proceedings Article | 18 July 2024 Poster + Paper

Development of a new near-infrared spectrometer for the IRSF telescope

Takuma Kokusho, Yuki Fujii, Kota Ogihara, Takahiro Nagayama, Takayoshi Kusune, Hidehiro Kaneda, Hidehiko Nakaya

Proceedings Volume 13096, 130967J (2024) https://doi.org/10.1117/12.3016577

KEYWORDS: Spectroscopy, Telescopes, Sensors, Indium gallium arsenide, Stars, Spectral resolution, Equipment, Infrared telescopes, Prisms, Observatories

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We present the current status of our development of a new near-infrared spectrometer for the InfraRed Survey Facility (IRSF) 1.4-m telescope, located in South Africa. The spectrometer is designed to cover the wavelength range of 1.0–1.6 μm with the spectral resolution of 550 at 1.2 μm and 730 at 1.6 μm and have a small number of optical surfaces to achieve a high optical throughput of 55%. The spectrometer is also equipped with a near-infrared slit viewer with a 3′×4′ field of view to perform precise spectral monitoring and mapping. We have tentatively completed the development of the instrument by using a commercial InGaAs detector and confirmed its expected sensitivity and spectral resolution by test observations with the Kagoshima University 1-m telescope. We now plan to replace the current detector with a new InGaAs detector developed for astronomical observations. The new detector covers the same wavelength range as the current one but has a significantly lower dark current and a larger array format, which enables us to upgrade the spectrometer to have higher sensitivity and spectral resolution. We plan to mount the spectrometer on the IRSF telescope by early 2025 after the detector is replaced and the second test observation with the Kagoshima University telescope is done.

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