Mr. Yutaro Hosoi Profile

Yutaro Hosoi

at Institute of Science Tokyo

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Proceedings Article | 19 July 2024 Poster

Performance test for HIDES-F wavelength calibration using a laser frequency comb

Masashi Omiya, Hideyuki Izumiura, Yutaro Hosoi, Hajime Inaba, Sho Okubo, Bun'ei Sato, Eiji Kambe, Yuki Moritani, Hiroki Harakawa, Takuya Takarada

Proceedings Volume 13096, 130963Z (2024) https://doi.org/10.1117/12.3018603

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We report on performance studies for wavelength calibration using a laser frequency comb and the fiber-fed HIgh Dispersion Echelle Spectrograph (HIDES-F) on the Okayama 188cm telescope. We use a laser frequency comb system that has been recently developed and reported. The comb is based on an erbium-doped fiber-based femtosecond laser and can generate comb-shaped laser modes with a wavelength range of 350nm - 408nm, 453nm - 543nm, and 664nm - 873nm with a mode spacing of 30GHz. The comb has been installed in a room of the Okayama 188cm telescope dome and has been in operation since 2020. The comb spectra were obtained during observations for precision radial velocity (RV) measurements with an iodine absorption for about two years. Using the spectra of the comb and other wavelength calibrators, we have measured instrument shifts of HIDES-F and evaluated its effects on wavelength calibration for precise RV measurements.

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