[7p-S301-1~7] State-of-the art optical science opening up the frontier of earth-like exoplanet exploration

4:30 PM - 5:00 PM JST(7:30 AM - 8:00 AM UTC)

[7p-S301-7] Er-Fiber-Comb-Based Visible-Range Wavelength Standard Source for High-Precision Astronomical Radial Velocity Measurements

〇Sho Okubo¹, Keisuke Nakamura¹, Ken Kashiwagi¹, Hideyuki Izumiura², Masashi Omiya^3,2, Akito Tajitsu², bun'ei Sato⁴, Feng-Lei Hong⁵, Yoshiaki Nakajima⁶, Hajime Inaba¹ (1.NMIJ, AIST, 2.NAOJ, 3.ABC, 4.Science Tokyo, 5.YNU, 6.Toho Univ.)

Keywords:

Optical frequency comb,Astronomical radial velocity measurement,Wavelength standard

High-precision radial velocity measurements of celestial objects are essential for detecting Earth-like exoplanets, for example. To achieve this level of precision, researchers are developing "astro-combs," which employ an optical frequency comb as a wavelength standard for spectrographs dedicated to radial velocity measurements. We have developed an astro-comb based on a mode-locked Er fiber laser with a 30 GHz mode spacing that covers 62 % of the visible wavelength range, and operate this system at the 188 cm telescope at Okayama Observatory. In our presentation, we will introduce the the system in detail and present examples of spectra recorded with the spectrograph.