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

Aoi Takahashi; Takayuki Kotani; Masayuki Kuzuhara; Takeru Nakajima; Riku Urago; Kou Hosokawa; Shotaro Tada; Motohide Tamura; Jun Nishikawa; Akitoshi Ueda; Takuya Takarada; Teruyuki Hirano; Takuma Kokusho; Eiko Kozaki; Takahiro Nagayama; Takahiro Sumi; Daisuke Suzuki; Hibiki Yama; Tomoyasu Yamamuro

doi:10.1117/12.3018194

18 July 2024 The South Africa Near-Infrared Doppler (SAND) instrument: design and fabrications

Aoi Takahashi, Takayuki Kotani, Masayuki Kuzuhara, Takeru Nakajima, Riku Urago, Kou Hosokawa, Shotaro Tada, Motohide Tamura, Jun Nishikawa, Akitoshi Ueda, Takuya Takarada, Teruyuki Hirano, Takuma Kokusho, Eiko Kozaki, Takahiro Nagayama, Takahiro Sumi, Daisuke Suzuki, Hibiki Yama, Tomoyasu Yamamuro

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 1309669 (2024) https://doi.org/10.1117/12.3018194
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The South Africa Near-infrared Doppler instrument (SAND) is a time-stable high-dispersion spectrograph, covering the z- and Y-bands simultaneously (849 - 1085 nm) with the maximum spectral resolution of ∼60,000. We aim to monitor the radial velocity of M-dwarfs with the precision of a few m/s level, which enables us to search for habitable exoplanets. Our another scientific motivation is the statistical investigation of young planets and stellar atmosphere to comprehensively understand the formation senario of stellar systems. We are planning to install the SAND to telescopes at the South African Astronomical Observatory (SAAO) in Sutherland, since the Southern sky covers plentiful stellar associations with young stars. The SAND is a fiber-fed spectrograph, and we can change telescope used to collect the star light by switching the fiber connection. It will be operated mainly with two telescopes: the Prime-focus Infrared Microlensing Experience telescope (PRIME) and the InfraRed Survey Facility (IRSF), which both are managed by universities in Japan. This strategy of using multiple telescopes gives us opportunities of frequent and long-term observations, which provides well phase coverage in radial velocity monitoring and results in non-bias search for exoplanets. Most of the components used in the spectrograph and the fiber injection module have been fabricated. We will present the detailed status and recent progress: designing the fiber injection module and the thermal control system, examination of fiber characteristics, and estimating our target candidates.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Aoi Takahashi, Takayuki Kotani, Masayuki Kuzuhara, Takeru Nakajima, Riku Urago, Kou Hosokawa, Shotaro Tada, Motohide Tamura, Jun Nishikawa, Akitoshi Ueda, Takuya Takarada, Teruyuki Hirano, Takuma Kokusho, Eiko Kozaki, Takahiro Nagayama, Takahiro Sumi, Daisuke Suzuki, Hibiki Yama, and Tomoyasu Yamamuro "The South Africa Near-Infrared Doppler (SAND) instrument: design and fabrications", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 1309669 (18 July 2024); https://doi.org/10.1117/12.3018194

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