scholarly journals Review of high-contrast imaging systems for current and future ground-based and space-based telescopes: Part II. Common path wavefront sensing/control and coherent differential imaging

2018 ◽  
Author(s):  
Nemanja Jovanovic ◽  
Olivier Guyon ◽  
Mamadou N'Diaye ◽  
Raphaël Galicher ◽  
Dan Sirbu ◽  
...  
Keyword(s):  
Imaging Systems ◽  
Wavefront Sensing ◽  
High Contrast ◽  
Contrast Imaging ◽  
Common Path ◽  
High Contrast Imaging ◽  
Differential Imaging

scholarly journals Deep residual learning for low-order wavefront sensing in high-contrast imaging systems

2020 ◽  
Vol 28 (18) ◽  
pp. 26267
Author(s):  
Gregory Allan ◽  
Iksung Kang ◽  
Ewan S. Douglas ◽  
George Barbastathis ◽  
Kerri Cahoy
Keyword(s):  
Imaging Systems ◽  
Wavefront Sensing ◽  
High Contrast ◽  
Contrast Imaging ◽  
Residual Learning ◽  
High Contrast Imaging ◽  
Low Order

scholarly journals Closed loop, DM diversity-based, wavefront correction algorithm for high contrast imaging systems

2007 ◽  
Vol 15 (19) ◽  
pp. 12338 ◽  
Author(s):  
Amir Give'on ◽  
Ruslan Belikov ◽  
Stuart Shaklan ◽  
Jeremy Kasdin
Keyword(s):  
Closed Loop ◽  
Imaging Systems ◽  
High Contrast ◽  
Correction Algorithm ◽  
Contrast Imaging ◽  
Wavefront Correction ◽  
High Contrast Imaging

scholarly journals A New Standard for Assessing the Performance of High Contrast Imaging Systems

2017 ◽  
Vol 155 (1) ◽  
pp. 19 ◽  
Author(s):  
Rebecca Jensen-Clem ◽  
Dimitri Mawet ◽  
Carlos A. Gomez Gonzalez ◽  
Olivier Absil ◽  
Ruslan Belikov ◽  
...  
Keyword(s):  
Imaging Systems ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging

scholarly journals Medium-resolution integral-field spectroscopy for high-contrast exoplanet imaging

2018 ◽  
Vol 617 ◽  
pp. A144 ◽  
Author(s):  
H. J. Hoeijmakers ◽  
H. Schwarz ◽  
I. A. G. Snellen ◽  
R. J. de Kok ◽  
M. Bonnefoy ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Cross Correlation ◽  
High Contrast ◽  
Contrast Imaging ◽  
Data Set ◽  
Stellar Spectrum ◽  
High Contrast Imaging ◽  
Medium Resolution ◽  
Differential Imaging ◽  
Integral Field

Context. Angular differential imaging (ADI) and spectral differential imaging (SDI) are well-established high-contrast imaging techniques, but their application is challenging for companions at small angular separations from their host stars. Aims. The aim of this paper is to investigate to what extent adaptive-optics assisted, medium-resolution (R ~ 5000) integral field spectrographs (IFS) can be used to directly detect the absorption of molecular species in the spectra of planets and substellar companions when these are not present in the spectrum of the star. Methods. We analysed archival data of the β Pictoris system taken with the SINFONI integral field spectrograph located at ESO’s Very Large Telescope, originally taken to image β Pictoris b using ADI techniques. At each spatial position in the field, a scaled instance of the stellar spectrum is subtracted from the data after which the residuals are cross-correlated with model spectra. The cross-correlation co-adds the individual absorption lines of the planet emission spectrum constructively, while this is not the case for (residual) telluric and stellar features. Results. Cross-correlation with CO and H2O models results in significant detections of β Pictoris b with signal-to-noise ratios (S/Ns) of 13.7 and 16.4 respectively. Correlation with a T = 1700 K BT-Settl model provides a detection with an S/N of 22.8. This in contrast to application of ADI, which barely reveals the planet. While the adaptive optics system only achieved modest Strehl ratios of 19–27% leading to a raw contrast of 1:240 at the planet position, cross-correlation achieves a 3σ contrast limit of 2.7 × 10−5 in this 2.5 hr data set, a factor ~40 below the raw noise level at an angular distance of 0.36′′ from the star. Conclusions. Adaptive-optics assisted, medium-resolution IFS, such as SINFONI on the VLT and OSIRIS on the Keck Telescope, can be used for high-contrast imaging utilizing cross-correlation techniques for planets that are close to their star and embedded in speckle noise. We refer to this method as molecule mapping, and advocate its application to observations with future medium resolution instruments, in particular ERIS on the VLT, HARMONI on the ELT and NIRSpec, and MIRI on the JWST.

scholarly journals High-order myopic coronagraphic phase diversity (COFFEE) for wave-front control in high-contrast imaging systems

2013 ◽  
Vol 21 (26) ◽  
pp. 31751 ◽  
Author(s):  
B. Paul ◽  
L. M. Mugnier ◽  
J.-F. Sauvage ◽  
M. Ferrari ◽  
K. Dohlen
Keyword(s):  
Wave Front ◽  
High Order ◽  
Imaging Systems ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
Phase Diversity

scholarly journals A Multiwavelength Differential Imaging Experiment for the High Contrast Imaging Testbed

2009 ◽  
Vol 121 (881) ◽  
pp. 716-727 ◽  
Author(s):  
Beth Biller ◽  
John Trauger ◽  
Dwight Moody ◽  
Laird Close ◽  
Andreas Kuhnert ◽  
...  
Keyword(s):  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
Imaging Experiment ◽  
Differential Imaging

Broadband wavefront correction algorithm for high-contrast imaging systems

2007 ◽  
Author(s):  
Amir Give'on ◽  
Brian Kern ◽  
Stuart Shaklan ◽  
Dwight C. Moody ◽  
Laurent Pueyo
Keyword(s):  
Imaging Systems ◽  
High Contrast ◽  
Correction Algorithm ◽  
Contrast Imaging ◽  
Wavefront Correction ◽  
High Contrast Imaging
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