Dr. Charles Hanot Profile

Dr. Charles Hanot

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Publications (13)

Proceedings Article | 24 September 2012 Paper

A diamond AGPM coronagraph for VISIR

C. Delacroix, O. Absil, D. Mawet, C. Hanot, M. Karlsson, P. Forsberg, E. Pantin, J. Surdej, S. Habraken

Proceedings Volume 8446, 84468K (2012) https://doi.org/10.1117/12.926494

KEYWORDS: Coronagraphy, Diamond, Exoplanets, Mid-IR, Microfabrication, Manufacturing, Photomasks, Phase shifts, Refractive index, Antireflective coatings

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Proceedings Article | 15 September 2011 Paper

Taking the vector vortex coronagraph to the next level for ground- and space-based exoplanet imaging instruments: review of technology developments in the USA, Japan, and Europe

Dimitri Mawet, Naoshi Murakami, Christian Delacroix, Eugene Serabyn, Olivier Absil, Naoshi Baba, Jacques Baudrand, Anthony Boccaletti, Rick Burruss, Russell Chipman, Pontus Forsberg, Serge Habraken, Shoki Hamaguchi, Charles Hanot, Akitoshi Ise, Mikael Karlsson, Brian Kern, John Krist, Andreas Kuhnert, Marie Levine, Kurt Liewer, Stephen McClain, Scott McEldowney, Bertrand Mennesson, Dwight Moody, Hiroshi Murakami, Albert Niessner, Jun Nishikawa, Nada O'Brien, Kazuhiko Oka, Peggy Park, Pierre Piron, Laurent Pueyo, Pierre Riaud, Moritsugu Sakamoto, Motohide Tamura, John Trauger, David Shemo, Jean Surdej, Nelson Tabirian, Wesley Traub, James Wallace, Kaito Yokochi

Proceedings Volume 8151, 815108 (2011) https://doi.org/10.1117/12.896059

KEYWORDS: Coronagraphy, Polarization, Spiral phase plates, Photonic crystals, Liquid crystals, Polymers, Telescopes, Exoplanets, Space telescopes, Optics manufacturing

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Proceedings Article | 11 August 2010 Paper

Annular groove phase mask coronagraph in diamond for mid-IR wavelengths: manufacturing assessment and performance analysis

C. Delacroix, P. Forsberg, M. Karlsson, D. Mawet, C. Lenaerts, S. Habraken, C. Hanot, J. Surdej, A. Boccaletti, J. Baudrand

Proceedings Volume 7731, 77314W (2010) https://doi.org/10.1117/12.858278

KEYWORDS: Coronagraphy, Diamond, Manufacturing, Microfabrication, L band, Metrology, Mid-IR, Photomasks, Spiral phase plates, Exoplanets

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Proceedings Article | 11 August 2010 Paper

Compared sensitivities of VLT, JWST and ELT for direct exoplanet detection in nearby stellar moving groups

Charles Hanot, Olivier Absil, Jean Surdej, Anthony Boccaletti, Christophe Vérinaud

Proceedings Volume 7731, 77313M (2010) https://doi.org/10.1117/12.856903

KEYWORDS: Stars, Planets, Optical spheres, Imaging systems, Space telescopes, James Webb Space Telescope, Coronagraphy, Telescopes, Exoplanets, Exoplanetary science

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Proceedings Article | 22 July 2010 Paper

The potential of rotating-baseline nulling interferometers operating within large single-telescope apertures

E. Serabyn, B. Mennesson, S. Martin, K. Liewer, D. Mawet, C. Hanot, F. Loya, M. Colavita, Sam Ragland

Proceedings Volume 7734, 77341E (2010) https://doi.org/10.1117/12.857753

KEYWORDS: Nulling interferometry, Stars, Interferometers, Telescopes, Adaptive optics, Interferometry, Space telescopes, Infrared telescopes, Coronagraphy, Solar system

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Proceedings Article | 22 July 2010 Paper

Direct imaging of Earth-like planets: why we care about exozodis

O. Absil, D. Defrère, A. Roberge, J.-C. Augereau, V. Coudé du Foresto, C. Hanot, C. Stark, J. Surdej

Proceedings Volume 7734, 77340L (2010) https://doi.org/10.1117/12.858257

KEYWORDS: Planets, Stars, Interferometry, Mid-IR, Interferometers, Signal detection, Infrared radiation, Clouds, Infrared spectroscopy, Planetary systems

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Proceedings Article | 22 July 2010 Paper

Development of a statistical reduction method for the Palomar Fiber Nuller

Charles Hanot, Bertrand Mennesson, Eugene Serabyn, Stefan Martin, Kurt Liewer, Frank Loya, Dimitri Mawet, Pierre Riaud, Olivier Absil

Proceedings Volume 7734, 77342S (2010) https://doi.org/10.1117/12.857014

KEYWORDS: Neodymium, Interferometry, Calibration, Nulling interferometry, Error analysis, Stars, Statistical analysis, Sodium, Interferometers, Visibility

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Proceedings Article | 22 July 2010 Paper

Development of a CELestial Infrared Nuller Experiment (CELINE) for broadband nulling and new single-mode fiber testing

Charles Hanot, Pierre Riaud, Dimitri Mawet, Olivier Absil, Jean Surdej, Serge Habraken

Proceedings Volume 7734, 77342L (2010) https://doi.org/10.1117/12.856843

KEYWORDS: Single mode fibers, Nulling interferometry, Phase shifts, Interferometry, Interferometers, K band, Infrared radiation, Optical filters, Wave plates, Exoplanets

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Proceedings Article | 15 July 2010 Paper

High contrast stellar observations within the diffraction limit at the Palomar Hale telescope

B. Mennesson, C. Hanot, E. Serabyn, S. Martin, K. Liewer, F. Loya, D. Mawet

Proceedings Volume 7735, 773511 (2010) https://doi.org/10.1117/12.857633

KEYWORDS: Adaptive optics, Stars, Interferometry, Telescopes, Coronagraphy, Near infrared, Nulling interferometry, K band, Visibility, Diffraction

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We report on high-accuracy, high-resolution (< 20mas) stellar measurements obtained in the near infrared ( 2.2 microns) at the Palomar 200 inch telescope using two elliptical (3m x 1.5m) sub-apertures located 3.4m apart. Our interferometric coronagraph, known as the "Palomar Fiber Nuller" (PFN), is located downstream of the Palomar adaptive optics (AO) system and recombines the two separate beams into a common singlemode fiber. The AO system acts as a "fringe tracker", maintaining the optical path difference (OPD) between the beams around an adjustable value, which is set to the central dark interference fringe. AO correction ensures high efficiency and stable injection of the beams into the single-mode fiber. A chopper wheel and a fast photometer are used to record short (< 50ms per beam) interleaved sequences of background, individual beam and interferometric signals. In order to analyze these chopped null data sequences, we developed a new statistical method, baptized "Null Self-Calibration" (NSC), which provides astrophysical null measurements at the 0.001 level, with 1 σ uncertainties as low as 0.0003. Such accuracy translates into a dynamic range greater than 1000:1 within the diffraction limit, demonstrating that the approach effectively bridges the traditional gap between regular coronagraphs, limited in angular resolution, and long baseline visibility interferometers, whose dynamic range is restricted to 100:1. As our measurements are extremely sensitive to the brightness distribution very close to the optical axis, we were able to constrain the stellar diameters and amounts of circumstellar emission for a sample of very bright stars. With the improvement expected when the PALM-3000 extreme AO system comes on-line at Palomar, the same instrument now equipped with a state of the art low noise fast read-out near IR camera, will yield 10^-4 to 10^-3 contrast as close as 30 mas for stars with K magnitude brighter than 6. Such a system will provide a unique and ideal tool for the detection of young (<100 Myr) self-luminous planets and hot debris disks in the immediate vicinity (0.1 to a few AUs) of nearby (< 50pc) stars.

Proceedings Article | 28 July 2008 Paper

The development and applications of a ground-based fiber nulling coronagraph

Stefan Martin, Eugene Serabyn, Kurt Liewer, Frank Loya, Bertrand Mennesson, Charles Hanot, Dimitri Mawet

Proceedings Volume 7013, 70131Y (2008) https://doi.org/10.1117/12.789484

KEYWORDS: Nulling interferometry, Telescopes, Space telescopes, Stars, Mirrors, Coronagraphy, Sensors, Signal detection, Single mode fibers, Adaptive optics

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Proceedings Article | 19 September 2007 Paper

Potential of space-based infrared Bracewell interferometers for planet detection

D. Defrère, O. Absil, C. Hanot, M. Fridlund

Proceedings Volume 6693, 66931N (2007) https://doi.org/10.1117/12.758669

KEYWORDS: Planets, Signal to noise ratio, Stars, Interferometers, Modulation, Clouds, Exoplanets, Telescopes, Nulling interferometry, Space operations

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Proceedings Article | 19 September 2007 Paper

Fresnel rhombs as achromatic phase shifters for infrared nulling interferometry: first experimental results

C. Hanot, D. Mawet, J. Loicq, D. Vandormael, J. Plesseria, J. Surdej, S. Habraken

Proceedings Volume 6693, 66931L (2007) https://doi.org/10.1117/12.758405

KEYWORDS: Scattering, Phase shifts, Polarizers, Infrared radiation, Manufacturing, Birefringence, Polarization, Spatial filters, Light scattering, Nulling interferometry

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Proceedings Article | 19 September 2007 Paper

The annular groove phase mask coronagraph: an achromatic optical vortex

Dimitri Mawet, Pierre Riaud, Charles Hanot, Denis Vandormael, Jérôme Loicq, Jacques Baudrand, Jean Surdej, Serge Habraken

Proceedings Volume 6693, 66931M (2007) https://doi.org/10.1117/12.758406

KEYWORDS: Coronagraphy, Polarization, Polarimetry, Spiral phase plates, Optical vortices, Quantum wells, Manufacturing, Numerical simulations, Speckle, Prototyping

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Showing 5 of 13 publications

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