Performance tests of Subaru/IRD for very precise and stable infrared radial velocity observations

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

doi:10.1117/12.2311832

12 July 2018 Performance tests of Subaru/IRD for very precise and stable infrared radial velocity observations

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

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 1070260 (2018) https://doi.org/10.1117/12.2311832
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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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, and Motohide Tamura "Performance tests of Subaru/IRD for very precise and stable infrared radial velocity observations", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070260 (12 July 2018); https://doi.org/10.1117/12.2311832

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