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.
We have developed a set of custom narrow-band filters for the twin multiband imagers MuSCAT3 and MuSCAT4 on the 2m telescopes of Las Cumbres Observatory. These filters are designed to detect sodium absorption in the atmospheres of hot Jupiters by means of multiband transit photometry. One of the filters is designed to observe the sodium doublet lines at 589.3 nm, while the others are optimized to measure the continuum of the transmission spectra, avoiding absorption and scattering by the Earth’s atmosphere. A pilot observation of a transit of the hot Jupiter WASP-104 b demonstrated the good performance of these custom narrow-band filters. This filter set enables an efficient survey to search for cloudless hot Jupiters, which can be prime targets for further atmospheric characterizations with space- and ground-based high-demand telescopes.
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