The Carnegie Planet Finder Spectrograph
The Carnegie Planet Finder Spectrograph
复制标题
卡内基行星探测器光谱仪
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. P. Butler
中科院分区：
文献类型：
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作者：
J. Crane;S. Shectman;R. P. Butler
卡内基行星探测器光谱仪正在建造中，以供智利拉斯坎帕纳斯天文台的麦哲伦望远镜使用。它的主要科学目标是通过监测恒星径向速度变化来探测太阳系外行星。该光谱仪正在进行优化，以便高精度地测量这些速度，分辨率目标为1米S-1。光学设计包括所有球面、标准光学玻璃和氟化钙透镜，在双程配置中既可用作相机，也可用作准直器。棱镜交叉分散器也用于双程，提供4.0角秒的最小顺序间隔。R4梯形光栅的照明接近真正的Littrow，提供了390 nm到620 nm之间的完整波长覆盖。当使用1角秒狭缝时，光谱分辨率为38,000，尽管可以选择窄至0.2角秒的狭缝宽度。碘池被用来将清晰的吸收特征叠加到光谱上，作为基准波长标尺，而传统的波长校准可以使用钍氩灯。该光谱仪目前正在建造中，计划于2007年第二季度投入使用。
The Carnegie Planet Finder Spectrograph is being constructed for use at the Magellan Telescopes at Las Campanas Observatory in Chile. Its primary scientific objective is the detection of extrasolar planets through monitoring of stellar radial velocity variations. The spectrograph is being optimized for high precision measurement of these velocities with a resolution goal of 1 m s-1. The optical design includes all spherical, standard optical glass and calcium fluoride lenses that function as both camera and collimator in a double-pass configuration. A prism cross-disperser is also used in double-pass and provides a minimum order separation of 4.0 arcsec. An R4 echelle grating is illuminated near true Littrow and provides complete wavelength coverage between 390 nm and 620 nm. Spectral resolution is 38,000 when using a 1 arcsec slit, although slit widths as small as 0.2 arcsec are available. An iodine cell is used to superimpose well-defined absorption features onto spectra to serve as a fiducial wavelength scale, and a thorium argon lamp is available for traditional wavelength calibrations. The spectrograph is currently under construction and is scheduled for commissioning in the second quarter of 2007.