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Test of Multi-object Exoplanet Search Spectral Interferometer
Kai Zhang; Liang Wang; Haijiao Jiang; Zhongwen Hu; Yongtian Zhu; Yonghui Hou; Songxin Dai; Jin Tang; Zhen Tang; Yizhong Zeng; Yi Chen; Lei Wang
Source PublicationGround-based and Airborne Instrumentation for Astronomy V
PagesVol.9147 58-1-8
Conference Date2014-6-22
Conference PlaceMontréal, Quebec, Canada
Funding OrganizationSPIE
Exoplanet detection, a highlight in the current astronomy, will be part of puzzle in astronomical and astrophysical future, which contains dark energy, dark matter, early universe, black hole, galactic evolution and so on. At present, most of the detected Exoplanets are confirmed through methods of radial velocity and transit. Guo shoujing Telescope well known as LAMOST is an advanced multi-object spectral survey telescope equipped with 4000 fibers and 16 low resolution fiber spectrographs. To explore its potential in different astronomical activities, a new radial velocity method named Externally Dispersed Interferometry (EDI) is applied to serve Exoplanet detection through combining a fixed-delay interferometer with the existing spectrograph in medium spectral resolution mode (R=5,000-10,000). This new technology has an impressive feature to enhance radial velocity measuring accuracy of the existing spectrograph through installing a fixed-delay interferometer in front of spectrograph. This way produces an interference spectrum with higher sensitivity to Doppler Effect by interference phase and fixed delay. This relative system named Multi-object Exoplanet
Search Spectral Interferometer (MESSI) is composed of a few parts, including a pair of multi-fiber coupling sockets, a remote control iodine subsystem, a multi-object fixed delay interferometer and the existing spectrograph. It covers from 500 to 550 nm and simultaneously observes up to 21 stars. Even if it’s an experimental instrument at present, it’s still well demonstrated in paper that how MESSI does explore an effective way to build its own system under the existing condition of LAMOST and get its expected performance for multi-object Exoplanet detection, especially instrument stability and its special data reduction. As a result of test at lab, inside temperature of its instrumental chamber is stable in a range of ±0.5degree Celsius within 12 hours, and the direct instrumental stability without further observation correction is equivalent to be ±50m/s every 20mins
KeywordExoplanet Detection Radial Velocity Measurement Multi-object Observation Fixed Delay Interferometer Interference Spectrum
Subject Area天文光谱仪 ; 天文技术与方法
Document Type会议论文
Recommended Citation
GB/T 7714
Kai Zhang,Liang Wang,Haijiao Jiang,et al. Test of Multi-object Exoplanet Search Spectral Interferometer[C]:SPIE,2014:Vol.9147 58-1-8.
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