NINJA: an LTAO assisted optical and near-infrared spectrograph of Subaru Telescope

Chihiro Tokoku; Shinobu Ozaki; Takashi Moriya; Kenshi Yanagisawa; Kentaro Motohara; Masami Ouchi; Nozomu Tominaga; Masaomi Tanaka; Yoshito Ono; Yosuke Minowa; Yutaka Hayano; Yusei Koyama; Sadman Ali; Masayuki Tanaka; Masayuki Akiyama; Tohru Nagao; Yoshiki Matsuoka; Kosuke Kushibiki; Shogo Homan; Akino Yasuda; Michitoshi Yoshida

doi:10.1117/12.2627749

29 August 2022 NINJA: an LTAO assisted optical and near-infrared spectrograph of Subaru Telescope

Chihiro Tokoku, Shinobu Ozaki, Takashi Moriya, Kenshi Yanagisawa, Kentaro Motohara, Masami Ouchi, Nozomu Tominaga, Masaomi Tanaka, Yoshito Ono, Yosuke Minowa, Yutaka Hayano, Yusei Koyama, Sadman Ali, Masayuki Tanaka, Masayuki Akiyama, Tohru Nagao, Yoshiki Matsuoka, Kosuke Kushibiki, Shogo Homan, Akino Yasuda, Michitoshi Yoshida

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121847R (2022) https://doi.org/10.1117/12.2627749
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Near-INfrared and optical Joint spectrograph with Adaptive optics (NINJA) is an optical to near-infrared (NIR) spectrograph optimized for the laser tomography adaptive optics (LTAO) system at the Subaru telescope, realized by the adaptive secondary mirror and four-laser guide star (LGS) system now under development. One of the primary science objectives of this spectrograph is wide-band spectroscopic follow-up of transient sources like GRB, supernovae, or gravitational wave sources down to 22 mag in the J -band. NINJA consists of two spectrograph units, one is in the optical (0.35-0.85 µm) and the other in the NIR (0.85-2.5 µm), and a fore-optics which splits the light from the telescope to the spectrographs and wavefront sensors (WFSs) of LTAO. Each spectrograph has a slit with 0.35′′ wide and 5′′ long, and a spectral resolution of R=3000-4000 utilizing a grating. The four LGSs are planned to be arranged on a circle around the slit with a radius of about 8′′, and a patrol field of view (FoV) of a tip-tilt guide star is about 2′ diameter. With two dichroic mirrors, the fore-optics splits the light of the FoV into three wavelength ranges of 0.35-0.85 µm, 0.85-2.5 µm, and 0.589 µm for LGS. In this paper, we report the overall system of NINJA and a conceptual design of the optics.

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Chihiro Tokoku, Shinobu Ozaki, Takashi Moriya, Kenshi Yanagisawa, Kentaro Motohara, Masami Ouchi, Nozomu Tominaga, Masaomi Tanaka, Yoshito Ono, Yosuke Minowa, Yutaka Hayano, Yusei Koyama, Sadman Ali, Masayuki Tanaka, Masayuki Akiyama, Tohru Nagao, Yoshiki Matsuoka, Kosuke Kushibiki, Shogo Homan, Akino Yasuda, and Michitoshi Yoshida "NINJA: an LTAO assisted optical and near-infrared spectrograph of Subaru Telescope", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121847R (29 August 2022); https://doi.org/10.1117/12.2627749

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