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Proceedings Paper

Performance tests of Subaru/IRD for very precise and stable infrared radial velocity observations
Author(s): Masayuki Kuzuhara; Teruyuki Hirano; Takayuki Kotani; Masato Ishizuka; Masashi Omiya; Mihoko Konishi; Tomoyuki Kudo; Jun Nishikawa; Akitoshi Ueda; Ko Hosokawa; Nobuhiko Kusakabe; Takashi Kurokawa; Tsukasa Kokubo; Takahiro Mori; Yosuke Tanaka; Shane Jacobson; Klaus Hodapp; Motohide Tamura
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Paper Abstract

The InfraRed Doppler (IRD) instrument is a high-dispersion spectrograph that is available on Subaru Telescope to explore extrasolar planets via infrared radial velocity (RV) observations. The Subaru/IRD is especially useful in the search of a low-mass planet around cool M-type dwarfs for which infrared RV observations are essential. We report our early performance tests for IRD. IRD’s two H2RG detectors have been evaluated with our detector readout technique, ensuring that their readout noise is made sufficiently smaller than the stellar photon noise expected in our planned survey. We have also tested the instrumental stability of RV measurements from the laboratory data obtained with the IRD’s calibration systems including a laser frequency comb (LFC). Among our tested three types of velocity stability, the stability of comb spectra obtained with a multi-mode fiber (MMF) relative to that with another MMF is measured to be ∼1 m s−1. We also infer from these tests that stellar RV measurements with an MMF can be calibrated with a short-term stability of 2 m s−1 or better by the simultaneously-observed reference spectra of LFC. Furthermore, we report preliminary on-sky RV measurements calibrated with a Thorium-Argon hollow-cathode lamp for RV-stable stars (τ Ceti and Barnard's star) and a planet-host (51 Pegasi). These preliminary RV measurements help the further performance test of IRD that will be performed by the on-sky observations with LFC.

Paper Details

Date Published: 12 July 2018
PDF: 12 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070260 (12 July 2018); doi: 10.1117/12.2311832
Show Author Affiliations
Masayuki Kuzuhara, AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)
Teruyuki Hirano, Tokyo Institute of Technology (Japan)
Takayuki Kotani, AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Masato Ishizuka, The Univ. of Tokyo (Japan)
Masashi Omiya, National Astronomical Observatory of Japan (Japan)
AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
Mihoko Konishi, National Astronomical Observatory of Japan (Japan)
AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
Tomoyuki Kudo, Subaru Telescope, National Astronomical Observatory of Japan (Japan)
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
The Graduate Univ. for Advanced Studies (Japan)
AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
Akitoshi Ueda, National Astronomical Observatory of Japan (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Ko Hosokawa, National Astronomical Observatory of Japan (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Nobuhiko Kusakabe, AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)
Takashi Kurokawa, Astrobiology Ctr., National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)
Tokyo Univ. of Agriculture and Technology (Japan)
Tsukasa Kokubo, Tokyo Univ. of Agriculture and Technology (Japan)
Takahiro Mori, Tokyo Univ. of Agriculture and Technology (Japan)
Yosuke Tanaka, Tokyo Univ. of Agriculture and Technology (Japan)
Shane Jacobson, Institute for Astronomy, Univ. of Hawai'i (United States)
Klaus Hodapp, Institute for Astronomy, Univ. of Hawai'i (United States)
Motohide Tamura, The Univ. of Tokyo (Japan)
AstroBiology Ctr., National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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