Guyon, Olivier, Matsuo, Taro, Angel, Roger
High contrast coronagraphic imaging of the immediate surrounding of stars requires exquisite control of low-order wavefront aberrations, such as tip-tilt (pointing) and focus. We propose an accurate,...
Guyon, Olivier, Pluzhnik, Eugene, Martinache, Frantz, Totems, Julien, Tanaka, Shinichiro, Matsuo, Taro, ...
The Phase-Induced Amplitude Apodization (PIAA) coronagraph is a high performance coronagraph concept able to work at small angular separation with little loss in throughput. We present results...
High Sensitivity Wavefront Sensing with a non-linear Curvature Wavefront Sensor (2009)
A new wavefront sensing approach, derived from the successful curvature wavefront sensing concept but using a non-linear phase retrieval wavefront reconstruction scheme, is described. The non-linear...
Comparison of optical observational capabilities for the coming decades: ground versus space (2009)
Mountain, Matt, Van Der Marel, Roeland, Soummer, Remi, Koekemoer, Anton, Ferguson, Harry, Postman, Marc, ...
Ground-based adaptive optics (AO) in the infrared has made exceptional advances in approaching space-like image quality at higher collecting area. Optical-wavelength applications are now also growing...
The Subaru Coronagraphic Extreme AO project (2009)
Martinache, Frantz, Guyon, Olivier, Lozi, Julien, Garrel, Vincent, Blain, Celia, Sivo, Gaetano
High contrast coronagraphic imaging is a challenging task for telescopes with central obscurations and thick spider vanes, such as the Subaru Telescope. Our group is currently assembling an extreme...
Aperture Masking Interferometry for Subaru (2009)
Martinache, Frantz, Guyon, Olivier, Garrel, Vincent
Aperture Masking Interferometry used in combination with Adaptive Optics, is a powerful technique that permits the detection of faint companions at small angular separations. The precision...
Lozi, Julien, Martinache, Frantz, Guyon, Olivier
High contrast coronagraphic imaging is challenging for telescopes with central obstructions and thick spider vanes, such as the Subaru Telescope. We present in this paper the first laboratory...
Greene, Tom, Cahoy, Kerri, Guyon, Olivier, Kasting, James, Marley, Mark, Meyer, Michael, ...
Significant advances in the discovery and characterization of the planetary systems of nearby stars can be accomplished with a moderate aperture high performance coronagraphic space mission that...
35 AO Imaging of Quasar Host Galaxies (2008)
Doug Simons, Damien Gratadour, Mike Sheehan, Thomas Geballe, Knut Olsen, Inger Jørgensen, ...
With Adaptive Optics (AO) This Gemini North image shows the well-known planetary nebula NGC 7009 (the Saturn Nebula) in the near infrared with adaptive optics. The image has a full-width-halfmaximum...
The Nulling Coronagraph (2007)
Olivier Guyon, François Roddier, J. Elon Graves, Salvador Cuevas, Carlos Espejo, Andrea Martinez, ...
Adaptive Optics can yield to sharp PSFs in which the light distribution from the center of the PSF to a few Airy rings is dominated by the diffraction of light through the entrance pupil of the...
Coronagraph Workshop papers (2007)
Traub, Wesley A., Abe, Lyu, Angel, Roger, Arenberg, Jon, Balasubramanian, Bala, Baudoz, Pierre, ...
This volume contains the written contributions corresponding to the oral presentations of about 45 authors at the Coronagraph Workshop 2006.
Stapelfeldt, Karl, Trauger, John, Traub, Weslay, Clampin, Mark, Oegerle, William, Wiseman, Jennifer, ...
We summarize the scientific potential of high contrast optical space imaging for studies of extrasolar planets, debris disks, and planet formation. The unique scientific capabilities offered by a 2-m...
Guyon, Olivier, Angel, James R. P., Bowers, Charles, Burge, James, Burrows, Adam, Codona, Johanan, ...
The Telescope to Observe Planetary Systems (TOPS) is a proposed space mission to image in the visible (0.4-0.9 micron) planetary systems of nearby stars simultaneously in 16 spectral bands...
Limits of Adaptive Optics for high contrast imaging (2005)
The effects of photon noise, aliasing, wavefront chromaticity and scintillation on the point spread function (PSF) contrast achievable with ground based adaptive optics (AO) are evaluated for...
Exoplanets imaging with a Phase-Induced Amplitude Apodization Coronagraph - I. Principle (2004)
Guyon, Olivier, Pluzhnik, Eugene A., Galicher, Raphael, Martinache, Frantz, Ridgway, Stephen T., Woodruff, Robert A.
Using 2 aspheric mirrors, it is possible to apodize a telescope beam without losing light or angular resolution: the output beam is produced by ``remapping'' the entrance beam to produce the desired...
In this paper, an alternative to the classical pupil apodization techniques (use of an amplitude pupil mask) is proposed. It is shown that an apodized pupil suitable for imaging of Extrasolar planets...
A Nulling Wide Field Imager for Exoplanets Detection and General Astrophysics (2002)
Guyon, Olivier, Roddier, Francois
We present a solution to obtain a high-resolution image of a wide field with the central source removed by destructive interference. The wide-field image is created by aperture synthesis with a...
Wide field interferometric imaging with single-mode fibers (2002)
Classical single-mode fiber interferometers, using one fiber per aperture, have very limited imaging capabilities and small field of view. Observations of extended sources (resolved by one aperture)...