Gemini Planet Imager coronagraph testbed results

被引:15
作者
Sivaramakrishnan, Anand [1 ,2 ]
Soummer, Remi [3 ]
Oppenheimer, Ben R. [1 ]
Carr, G. Lawrence [4 ]
Mey, Jacob L. [1 ]
Brenner, Doug [1 ]
Mandeville, Charles W. [1 ]
Zimmerman, Neil [1 ,5 ]
Macintosh, Bruce A. [6 ]
Graham, James R. [7 ]
Saddlemyer, Les [8 ]
Bauman, Brian [6 ]
Carlotti, Alexis [9 ]
Pueyo, Laurent [10 ]
Tuthill, Peter G. [11 ]
Dorrer, Christophe [12 ]
Roberts, Robin [1 ]
Greenbaum, Alexandra [13 ]
机构
[1] Amer Museum Nat Hist, 79th St CPW, New York, NY 10024 USA
[2] SUNY Stony Brook, Stony Brook, NY 11794 USA
[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[4] Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA
[5] Columbia Univ, New York, NY 10027 USA
[6] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA
[7] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[8] Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada
[9] Princeton Univ, Princeton, NJ 08544 USA
[10] Jet Prop Lab, Pasadena, CA 91109 USA
[11] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
[12] Aktiwave, Rochester, NY 14620 USA
[13] Rensselaer Polytech Inst, Troy, NY 12180 USA
来源
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY III | 2010年 / 7735卷
基金
美国国家科学基金会;
关键词
apodized pupil Lyot coronagraph; National Synchrotron Light Source; adaptive optics; coronagraph; coronagraphic astometry; coronagraphic photometry; high-contrast imaging; integral field spectrograph; extrasolar planet; PHOTOMETRY; ASTROMETRY; DESIGN;
D O I
10.1117/12.858623
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Gemini Planet Imager (GPI) is an extreme AO coronagraphic integral field unit YJHK spectrograph destined for first light on the 8m Gemini South telescope in 2011. GPI fields a 1500 channel AO system feeding an apodized pupil Lyot coronagraph, and a nIR non-common-path slow wavefront sensor. It targets detection and characterizion of relatively young (< 2GYr), self luminous planets up to 10 million times as faint as their primary star. We present the coronagraph subsystem's in-lab performance, and describe the studies required to specify and fabricate the coronagraph. Coronagraphic pupil apodization is implemented with metallic half-tone screens on glass, and the focal plane occulters are deep reactive ion etched holes in optically polished silicon mirrors. Our JH testbed achieves H-band contrast below a million at separations above 5 resolution elements, without using an AO system. We present an overview of the coronagraphic masks and our testbed coronagraphic data. We also demonstrate the performance of an astrometric and photometric grid that enables coronagraphic astrometry relative to the primary star in every exposure, a proven technique that has yielded on-sky precision of the order of a milliarsecond.
引用
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页数:12
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