The South Africa Near-Infrared Doppler (SAND) instrument: concept and instrument design

Aoi Takahashi; Takayuki Kotani; Jun Nishikawa; Akitoshi Ueda; Masayuki Kuzuhara; Motohide Tamura; Takahiro Nagayama; Mikio Kurita; Takahiro Sumi; Tomoyasu Yamamuro; Bun'ei Sato; Teruyuki Hirano; Masashi Omiya

doi:10.1117/12.2560342

28 December 2020 The South Africa Near-Infrared Doppler (SAND) instrument: concept and instrument design

Aoi Takahashi, Takayuki Kotani, Jun Nishikawa, Akitoshi Ueda, Masayuki Kuzuhara, Motohide Tamura, Takahiro Nagayama, Mikio Kurita, Takahiro Sumi, Tomoyasu Yamamuro, Bun'ei Sato, Teruyuki Hirano, Masashi Omiya

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114473E (2020) https://doi.org/10.1117/12.2560342
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We are developing a high-resolution near-infrared spectrograph for exoplanet searches with telescopes in Suther- land, South Africa; the South Africa Near-infrared Doppler (SAND) instrument. It covers the z- and Y -bands (0.83–1.10 µm) simultaneously with a maximum spectral resolution of 55, 000. This specification enables the precise radial velocity (RV) measurements to search for both giant planets around young stars and habitable planets around nearby M-dwarfs. The SAND is a fiber-fed instrument and, therefore, can be installed into several telescopes at the same site by changing the fiber connection. It will be operated mainly on the PRIME telescope, which is newly developed by Osaka University in Japan. The InfraRed Survey Facility (IRSF) and the Southern African Large Telescope (SALT) are also candidate telescopes for the installation. Inside the SAND spectrograph, a star image ejected from the fiber is sliced half and each sliced image is spectrally dispersed by an echelle grating. As a reference source for the wavelength calibration, light transmitted from a Fabry-Perot Etalon is simultaneously injected into the spectrograph and share the almost identical optical pass. The SAND is expected to realize RV-measurements for targets in large stellar associations at the southern sky, with exclusive and flexible use of the telescope time.

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Aoi Takahashi, Takayuki Kotani, Jun Nishikawa, Akitoshi Ueda, Masayuki Kuzuhara, Motohide Tamura, Takahiro Nagayama, Mikio Kurita, Takahiro Sumi, Tomoyasu Yamamuro, Bun'ei Sato, Teruyuki Hirano, and Masashi Omiya "The South Africa Near-Infrared Doppler (SAND) instrument: concept and instrument design", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114473E (28 December 2020); https://doi.org/10.1117/12.2560342

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