Gemini High-resolution Optical SpecTrograph (GHOST) at Gemini-South: Instrument performance and integration, first science, and next steps

arXiv - PHYS - Solar and Stellar Astrophysics Pub Date : 2024-09-09 DOI:arxiv-2409.05855

V. M. Kalari, R. J. Diaz, G. Robertson, A. McConnachie, M. Ireland, R. Salinas, P. Young, C. Simpson, C. Hayes, J. Nielsen, G. Burley, J. Pazder, M. Gomez-Jimenez, E. Martioli, S. B. Howell, M. Jeong, S. Juneau, R. Ruiz-Carmona, S. Margheim, A. Sheinis, A. Anthony, G. Baker, T. A. M. Berg, T. Cao, E. Chapin, T. Chin, K. Chiboucas, V. Churilov, E. Deibert, A. Densmore, J. Dunn, M. L. Edgar, J. Heo, D. Henderson, T. Farrell, J. Font, V. Firpo, J. Fuentes, K. Labrie, S. Lambert, J. Lawrence, J. Lothrop, R. McDermid, B. W. Miller, G. Perez, V. M. Placco, P. Prado, C. Quiroz, F. Ramos, R. Rutten, K. M. G. Silva, J. Thomas-Osip, C. Urrutia, W. D. Vacca, K. Venn, F. Waller, L. Waller, M. White, S. Xu, R. Zhelem

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Abstract

The Gemini South telescope is now equipped with a new high-resolution spectrograph called GHOST (the Gemini High-resolution Optical SpecTrograph). This instrument provides high-efficiency, high-resolution spectra covering 347-1060 nm in a single exposure of either one or two targets simultaneously, along with precision radial velocity spectroscopy utilizing an internal calibration source. It can operate at a spectral element resolving power of either 76000 or 56000, and can reach a SNR$\sim$5 in a 1hr exposure on a V$\sim$20.8 mag target in median site seeing, and dark skies (per resolution element). GHOST was installed on-site in June 2022, and we report performance after full integration to queue operations in November 2023, in addition to scientific results enabled by the integration observing runs. These results demonstrate the ability to observe a wide variety of bright and faint targets with high efficiency and precision. With GHOST, new avenues to explore high-resolution spectroscopy have opened up to the astronomical community. These are described, along with the planned and potential upgrades to the instrument.

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位于双子座南区的双子座高分辨率光学摄谱仪（GHOST）：仪器性能和集成、首次科学实验以及下一步工作

双子座南望远镜现在配备了一台名为 GHOST（双子座高分辨率光学摄谱仪）的新型高分辨率摄谱仪。这台仪器可以在一次曝光中同时对一个或两个目标提供覆盖 347-1060 纳米的高效率、高分辨率光谱，并利用内部校准源进行精确的径向速度光谱分析。它可以在 76000 或 56000 分辨率的光谱元件分辨率下运行，在中值视场和暗天条件下，对 20.8 等的目标进行 1 小时的曝光，信噪比可达到 5（每个分辨率元件）。GHOST于2022年6月在现场安装，我们报告了2023年11月完全整合到队列运行之后的性能，以及整合观测运行所取得的科学结果。这些结果展示了以高效率和高精度观测各种亮目标和暗目标的能力。GHOST 为天文学界开辟了探索高分辨率光谱的新途径。

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arXiv - PHYS - Solar and Stellar Astrophysics

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