Construction of a LAMOST high resolution spectrograph

Tianyi, 张天一 Zhang; Yong-tian, 朱永田 Zhu; Yonghui, 侯永辉 Hou; Kai, 张凯 Zhang; Zhongwen, 胡中文 Hu; Lei, 王磊 Wang; Yi, 陈忆 Chen; Haijiao, 姜海娇 Jiang; Zhen, 汤 振 Tang; Ming-ming, 许明明 Xu; Ming-da, 姜明达 Jiang

doi:10.3788/co.20191201.0148

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“…Thanks to the high precision astrometry catalogs released by Gaia [111][112][113][114] and the long baseline formed by Gaia and its precursor, Hipparcos [115,116] , many substellar companions detected by the radial velocity method have been confirmed, with absolute masses determined by combined analyses of radial velocity(RV) and astrometry data [117][118][119][120] . However, these detections are limited to super-Jupiters, or more massive companions due to the limited precision and time span of the current Gaia data and the limited number of stars with high precision RV data.…”

Section: Detection Of Cold Giant Planetsmentioning

confidence: 99%

The Jiao Tong University Spectroscopic Telescope Project

Team,

Liu,

et al. 2024

Astronomical Techniques and Instrument

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The Jiao Tong University Spectroscopic Telescope (JUST) is a 4.4-meter f/6.0 segmented-mirror telescope dedicated to spectroscopic observations. The JUST primary mirror is composed of 18 hexagonal segments, each with a diameter of 1.1 m. JUST provides two Nasmyth platforms for placing science instruments. One Nasmyth focus fits a field of view of 10 ′ and the other has an extended field of view of 1.2° with correction optics. A tertiary mirror is used to switch between the two Nasmyth foci. JUST will be installed at a site at Lenghu in Qinghai Province, China, and will conduct spectroscopic observations with three types of instruments to explore the dark universe, trace the dynamic universe, and search for exoplanets: (1) a multi-fiber (2000 fibers) medium-resolution spectrometer (R=4 000−5 000) to spectroscopically map galaxies and large-scale structure; (2) an integral field unit (IFU) array of 500 optical fibers and/or a long-slit spectrograph dedicated to fast follow-ups of transient sources for multi-messenger astronomy; (3) a high-resolution spectrometer (R~100 000) designed to identify Jupiter analogs and Earth-like planets, with the capability to characterize the atmospheres of hot exoplanets.

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