Extreme adaptive optics imaging with a clear and well-corrected off-axis telescope subaperture

被引:40
作者
Serabyn, E.
Wallace, K.
Troy, M.
Mennesson, B.
Haguenauer, P.
Gappinger, R.
Burruss, R.
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] CALTECH, Palomar Observ, Palomar Mt, CA 92060 USA
关键词
instrumentation : adaptive optics;
D O I
10.1086/511949
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Rather than using an adaptive optics (AO) system to correct a telescope's entire pupil, it can instead be used to more finely correct a smaller subaperture. Indeed, existing AO systems can be used to correct a subaperture 1/3 to 1/2 the size of a 5-10 m telescope to extreme adaptive optics (ExAO) levels. We discuss the potential performance of a clear off-axis well-corrected subaperture (WCS), and describe our initial imaging results with a 1.5 m diameter WCS on the Palomar Observatory's Hale Telescope. These include measured Strehl ratios of 0.92-0.94 in the infrared (2.17 mu m) and approximate to 0.12 in the B band, the latter allowing a binary of separation 0.34" to be easily resolved in the blue. Such performance levels enable a variety of novel observational modes, such as infrared ExAO, visible-wavelength AO, and high-contrast coronagraphy. One specific application suggested by the high Strehl ratio stability obtained (1%) is the measurement of planetary transits and eclipses. Also described is a simple "dark hole'' experiment carried out on a binary star, in which a comatic phase term was applied directly to the deformable mirror, in order to shift the diffraction rings to one side of the point-spread function.
引用
收藏
页码:1386 / 1391
页数:6
相关论文
共 27 条
[1]   GROUND-BASED IMAGING OF EXTRASOLAR PLANETS USING ADAPTIVE OPTICS [J].
ANGEL, JRP .
NATURE, 1994, 368 (6468) :203-207
[2]  
BORDE PJ, 2006, P SPIE, V6265
[3]  
Born M., 1984, PRINCIPLES OPTICS
[4]   Detection of thermal emission from an extrasolar planet [J].
Charbonneau, D ;
Allen, LE ;
Megeath, ST ;
Torres, G ;
Alonso, R ;
Brown, TM ;
Gilliland, RL ;
Latham, DW ;
Mandushev, G ;
O'Donovan, FT ;
Sozzetti, A .
ASTROPHYSICAL JOURNAL, 2005, 626 (01) :523-529
[5]  
Codona J., 2006, P SPIE, V6269
[6]   Infrared radiation from an extrasolar planet [J].
Deming, D ;
Seager, S ;
Richardson, LJ ;
Harrington, J .
NATURE, 2005, 434 (7034) :740-743
[7]   Theoretical limits on extrasolar terrestrial planet detection with coronagraphs [J].
Guyon, O. ;
Pluzhnik, E. A. ;
Kuchner, M. J. ;
Collins, B. ;
Ridgway, S. T. .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2006, 167 (01) :81-99
[8]  
GUYON O, 2006, P SPIE, V6265
[9]  
HAGUENAUER P, 2005, P SPIE, V5905
[10]  
HAGUENAUER P, 2006, P SPIE, V6265