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Proceedings Paper

EXOhSPEC folded design optimization and performance estimation
Author(s): Esther Lhospice; Christophe Buisset; Hugh R. A. Jones; William E. Martin; Ronny Errmann; Sirinrat Sithajan; Chantira Boonsri; Piyamas Choochalerm; Guillem Anglada-Escudé; David Campbell; Mary Angelie Alagao; Jitsupa Paenoi; Apirat Prasit; Thirasak Panyaphirawat; Somsawat Rattanasoon; Apichat Leckngam; David Mkrtichian; Suparerk Aukkaravittayapun
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Paper Abstract

The EXOplanet high resolution SPECtrograph (EXOhSPEC) instrument is an echelle spectrograph dedicated to the detection of exoplanets by using the radial velocity method using 2m class telescopes. This spectrograph is specified to provide spectra with a spectral resolution R < 70, 000 over the spectral range from 400 to 700 nm and to reach a shortterm radial velocity precision of 3 m/s. To achieve this the separation between two adjacent spectral orders is specified to be greater than 30 pixels and to enable a wide range of targets the throughput of the instrument is specified to be higher than 4%. We present the results of the optimization of the spectrograph collimator performed and initial tests of its optical performance. First, we consider the spectrograph design and we estimate its theoretical performance. We show that the theoretical image quality is close to the diffraction limit. Second, we describe the method used to perform the tolerancing analyzes using ZEMAX software to estimate the optical performance of the instrument after manufacturing, assembly and alignment. We present the results of the performance budget and we show that the estimated image quality performance of EXOhSPEC are in line with the specifications. Third, we present the results of the stray light analysis and we show that the minimum ratio between the scientific signal and the stray light halo signal is higher than 1,000. Finally, we provide a status on the progress of the EXOhSPEC project and we show the first results obtained with a preliminary version of the prototype.

Paper Details

Date Published: 9 September 2019
PDF: 15 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 111170Z (9 September 2019);
Show Author Affiliations
Esther Lhospice, National Astronomical Research Institute of Thailand (Thailand)
Institut d'optique Graduate School (France)
Christophe Buisset, National Astronomical Research Institute of Thailand (Thailand)
Hugh R. A. Jones, Univ. of Hertfordshire (United Kingdom)
William E. Martin, Univ. of Hertfordshire (United Kingdom)
Ronny Errmann, Univ. of Hertfordshire (United Kingdom)
Sirinrat Sithajan, National Astronomical Research Institute of Thailand (Thailand)
Chantira Boonsri, National Astronomical Research Institute of Thailand (Thailand)
Piyamas Choochalerm, Univ. of Hertfordshire (United Kingdom)
Guillem Anglada-Escudé, Queen Mary Univ. of London (United Kingdom)
David Campbell, Univ. of Hertfordshire (United Kingdom)
Mary Angelie Alagao, National Astronomical Research Institute of Thailand (Thailand)
Jitsupa Paenoi, National Astronomical Research Institute of Thailand (Thailand)
Apirat Prasit, National Astronomical Research Institute of Thailand (Thailand)
Thirasak Panyaphirawat, National Astronomical Research Institute of Thailand (Thailand)
Somsawat Rattanasoon, National Astronomical Research Institute of Thailand (Thailand)
Apichat Leckngam, National Astronomical Research Institute of Thailand (Thailand)
David Mkrtichian, National Astronomical Research Institute of Thailand (Thailand)
Suparerk Aukkaravittayapun, National Astronomical Research Institute of Thailand (Thailand)


Published in SPIE Proceedings Vol. 11117:
Techniques and Instrumentation for Detection of Exoplanets IX
Stuart B. Shaklan, Editor(s)

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