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Testing of a transmission-filter coronagraph for ground-based imaging of exoplanets
Jiangpei Dou; Deqing Ren; Yongtian Zhu; Xi Zhang; Xue Wang
Source PublicationGround-based and Airborne Instrumentation for Astronomy III
PagesVol.7735 8E-1-9
Conference Date2010-6-27
Conference PlaceSan Diego, California, USA
Funding OrganizationThe International Society for Optical Engineering
We present the latest laboratory test of a new coronagraph using one step-transmission filter at the visible wavelength. The primary goal of this work is to test the feasibility and stability of the coronagraph, which is designed for the ground-based telescope especially with a central obstruction and spider structures. The transmission filter is circular symmetrically coated with inconel film on one surface and manufactured with a precisely position-controlled physical mask during the coating procedure. At first, the transmission tolerance of the filter is controlled within 5% for each circular step. The target contrast of the coronagraph is set to be 10-5~10-7at an inner working angle around 5λ/D. Based
on the high-contrast imaging test-bed in the laboratory, the point spread function image of the coronagraph is obtained and it has delivered a contrast better than 10-6at 5λ/D. As a follow-up effort, the transmission error should be controlled in 2% and the transmission for such filter will be optimized in the near infrared wavelength, which should deliver better performances. Finally, it is shown that the transmission-filter coronagraph is a promising technique to be used for the direct imaging of exoplanets from the ground.
KeywordExtra-solar Planets Hot Jupiters High-contrast Imaging Coronagraphy Step-transmission Filter Ground-based Telescopes
Subject Area系外行星探测
Document Type会议论文
Recommended Citation
GB/T 7714
Jiangpei Dou,Deqing Ren,Yongtian Zhu,et al. Testing of a transmission-filter coronagraph for ground-based imaging of exoplanets[C]:SPIE,2010:Vol.7735 8E-1-9.
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