The First Public Data from the Gemini High-Resolution Optical Spectrograph

In the next few years, the International Gemini Observatory, a program of NSF’s NOIRLab, is pursuing an ambitious plan for new instrumentation. That plan includes the Gemini Infrared Multi-Object Spectrograph (GIRMOS), the IGRINS-2 high-resolution near-infrared spectrograph, the SCORPIO optical and near-infrared imager, and the upgraded Gemini Planet Imager 2.0. The first of these new instruments — and the first facility instrument that Gemini has commissioned in more than a decade — is the Gemini High-Resolution Optical Spectrograph (GHOST), a new workhorse high-resolution spectrograph that will be available to the community in shared-risk mode in Semester 2023B. GHOST is a fiber-fed, echelle spectrograph with coverage from 363 to 950 nm; it provides two-target spectroscopy at resolutions of greater than 50,000 and single-target spectroscopy at resolutions of more than 75,000.