GAOES-RV∗ (Gunma Astronomical Observatory Echelle Spectrograph for Radial Velocimetry) is a high-dispersion echelle spectrograph for the 3.8 m Seimei Telescope at Okayama Observatory, Kyoto University. GAOES†, the predecessor of GAOES-RV, had been operated with the 1.5 m telescope at Gunma Astronomical Observatory until 2020, and it was refashioned and moved to the Seimei Telescope as a precision RV instrument, GAOES-RV.
A multi-mode optical fiber of GAOES-RV collects stellar light within a 2.2 arcsec diameter field-of-view (FOV) at the Nasmyth focus, and an image slicer is used at the other end of the fiber to achieve the high spectral resolution of R=65,000 for such a wide FOV. The wavelength coverage of GAOES-RV is 516–593 nm and the total throughput is ∼2.5–3%. GAOES-RV achieves a precision of about 2 m s−1 in RV measurements for a bright slowly-rotating solar-type star using an iodine absorption cell.
GAOES-RV has been in operation since July 2023, and is widely used for a variety of scientific observations, including the detection and characterization of exoplanets, stellar abundance analysis, and research on active stars.
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