Lucky imaging and speckle discrimination for the detection of faint companions with adaptive optics
Lucky imaging and speckle discrimination for the detection of faint companions with adaptive optics
复制标题
利用自适应光学器件检测微弱伴星的幸运成像和散斑辨别
DOI:
10.1117/12.788442
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
Gladysz S
中科院分区:
文献类型:
--
作者:
Gladysz S
We have analyzed the application of frame selection ("lucky imaging") to adaptive optics (AO), short-exposure observations of faint companions. We have used the instantaneous Strehl ratio as an image quality metric. The probability density function (PDF) of this quantity can be used to determine the outcome of frame selection in terms of optimizing the Strehl ratio and the peak-signal-to-noise-ratio of the shift-and-add image. In the presence of static speckles, frame selection can lead to both: improvement in resolution--as quantified by the Strehl ratio, as well as faint signal detectability--given by the peak-signal-to-noise-ratio. This theoretical prediction is confirmed with real data from AO observations using Lick Observatory's 3m Shane telescope, and the Palomar Observatory's 5m Hale telescope. In addition, we propose a novel statistics-based technique for the detection of faint companions from a sequence of AO-corrected exposures. The algorithm, which we call stochastic speckle discrimination, utilizes the "statistical signature" of the centre of the point spread function (PSF) to discriminate between faint companions and static speckles. The technique yields excellent results even for signals invisible in the shift-and-add images.
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影响因子:
6.5
作者:
J. Baldwin;R. Tubbs;G. C. Cox;C. Mackay;R. Wilson;M. Andersen
通讯作者:
M. Andersen
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
R. Soummer;A. Ferrari;C. Aime;L. Jolissaint
通讯作者:
L. Jolissaint
DOI:
10.1086/509063
发表时间:
2006-09
期刊:
The Astrophysical Journal
影响因子:
--
作者:
S. Hinkley;B. Oppenheimer;R. Soummer;A. Sivaramakrishnan;Lewis C. Roberts Jr.;J. Kuhn;R. Makidon;M. Perrin;J. Lloyd;K. Kratter;D. Brenner
通讯作者:
S. Hinkley;B. Oppenheimer;R. Soummer;A. Sivaramakrishnan;Lewis C. Roberts Jr.;J. Kuhn;R. Makidon;M. Perrin;J. Lloyd;K. Kratter;D. Brenner
DOI:
--
发表时间:
2006
期刊:
The Astrophysical Journal 652・2
影响因子:
--
作者:
Itoh;Y.;Oasa;Y.;Fukagawa;M.
通讯作者:
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DOI:
--
发表时间:
2000
期刊:
Astronomical Telescopes and Instrumentation
影响因子:
--
作者:
J. Lloyd;Michael C. Liu;B. Macintosh;S. Severson;W. Deich;J. Graham
通讯作者:
J. Graham