A laboratory experiment for a new free-standing pupil mask coronagraph
A laboratory experiment for a new free-standing pupil mask coronagraph
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新型独立式瞳孔面罩日冕仪的实验室实验
DOI:
10.1117/12.925845
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
T.
中科院分区:
文献类型:
--
作者:
Haze;K. ; Enya;K.; Kotani;T.; Abe;L.; Nakagawa;T.; Matsuhara;H.; Sato;T.; Tamamuro;T.
This paper presents the results of a laboratory experiment on a new free-standing pupil mask coronagraph for the direct observation of exoplanets. We focused on a binary-shaped pupil coronagraph, which is planned for installation in the next-generation infrared space telescope SPICA. Our laboratory experiments on the coronagraph were implemented inside a vacuum chamber (HOCT) to achieve greater thermal stability and to avoid air turbulence, and a contrast of 1.3×10-9was achieved with PSF subtraction. We also carried out multi-color/broadband experiments to demonstrate that the pupil mask coronagraph works, in principle, at all wavelengths. We had previously manufactured a checker-board mask, a type of binary-shaped pupil mask, on a glass substrate, which had the disadvantages of light loss by transmission, ghosting from residual reflectance and a slightly different refractive index for each wavelength. Therefore, we developed a new free-standing mask in sheet metal, for which no substrate was needed. As a result of a He-Ne laser experiment with the free-standing mask, a contrast of 1.0×10−7was achieved for the raw coronagraphic image. We also conducted rotated mask subtractions and numerical simulations of some errors in the mask shape and WFEs. Speckles are the major limiting factor. The free-standing mask exhibited about the same ability to improve contrast as the substrate mask. Consequently, the results of this study suggest that the binary-shaped pupil mask coronagraph can be applied to coronagraphic observations by SPICA and other telescopes.
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DOI:
10.1117/12.893508
发表时间:
2011
期刊:
Proc.of SPIE
影响因子:
--
作者:
Enya;K.; Abe;L.; Takeuchi;S.; Kotani;T.; Yamamuro;T.
通讯作者:
T.
影响因子:
2.3
作者:
K. Enya;K. Haze;T. Kotani;L. Abe
通讯作者:
L. Abe
DOI:
10.1029/130gm25
发表时间:
2002
期刊:
Geophysical monograph
影响因子:
--
作者:
W. Traub;K. Jucks
通讯作者:
K. Jucks
DOI:
10.1117/12.856927
发表时间:
2001
期刊:
arXiv: Astrophysics
影响因子:
--
作者:
D. Spergel
通讯作者:
D. Spergel
DOI:
10.1086/374971
发表时间:
2003
期刊:
The Astrophysical Journal
影响因子:
--
作者:
R. Vanderbei;D. Spergel;N. Kasdin
通讯作者:
N. Kasdin