Dr. Farrokh Vakili-Christensen Profile

Dr. Farrokh Vakili-Christensen

Professor and Director at Observatoire de la Côte d'Azur

SPIE Involvement:

Author

Publications (52)

Proceedings Article | 27 August 2024 Poster + Paper

Characteristics and performances of the small and large field adaptive optics system AOC at the C2PU telescope

L. Abe, O. Lai, F.-X. Schmider, M. Carbillet, J. Dejonghe, É. Aristidi, B. Buralli, F. Martinache, J.-P. Rivet, F. Vakili

Proceedings Volume 13097, 130972Z (2024) https://doi.org/10.1117/12.3016304

KEYWORDS: Adaptive optics, Simulations, Wavefront sensors, Jupiter, Telescopes, Cameras, Stars, Control systems, Electron multiplying charge coupled devices, Human-machine interfaces

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AOC (Adaptive Optics system at Calern) is an adaptive optics bench being developed on the Epsilon (East) telescope of the two 1m telescopes of C2PU (Centre Pédagogique Planète Univers), Calern observatory, Observatoire de la Côte d'Azur (OCA), near Nice (France). It is installed at the F/35 Coudé focus, and aims at correcting the wavefront in the visible and in the near-infrared, using an ALPAO 11x11 actuator-across deformable mirror feeding a 10x10 Shack-Hartmann wavefront sensor. It is currently being upgraded with a First Light Imaging OCAM2 EMCCD detector, which will allow us to increase the number of available pixels per sub-aperture and the loop frequency, as well as to take advantage from a negligible read-out. The system is designed to work both in a standard stellar mode and in a more innovative planetary mode, capable of operating on planets such as Mars, Saturn and Jupiter, with a field up to 60arcsec. Such a wide field is much larger than the isoplanatic angle, therefore only the turbulent ground layer can be corrected, up to an altitude of a few thousand meters. Extensive simulations have been carried out of these two different modes. The system is now undergoing implementation and validation using a low order modal control (10 to 16 modes), but a zonal control will be implemented next to ensure performance improvement down to λ∼500nm. The loop frequency was limited to 500Hz by the speed of the Andor iXon camera, but its replacement by an OCAM2 camera will allow to reach between 1.5 and 2.2kHz (depending on binning). Theoretical performance of the system has been studied through simulations for the planetary mode and presented previously at SPIE. Here we present the implementation of the system and its preliminary performance on the sky and comparison with the simulations. In the future, we plan to better characterize the temporal transfer function as a function of the gain and the number of corrected modes, in order to implement an automatic gain control, both zonally in the visible and modally for near infrared applications. We are also implementing a control of the non-common path aberrations (NCPA). This is done by analysing the aberrations on a defocused stellar image, using the DONUT algorithm. We intend to characterize these NCPA in real-time directly from the observations. We also consider parameterizing the resulting point-spread function from the real-time statistics of the adaptive optics system to be used for further data analysis.

Proceedings Article | 30 August 2022 Poster + Paper

Numerical modelling of the planetary adaptive optics mode of AOC, the adaptive optics project at Calern Observatory

B. Buralli, O. Lai, M. Carbillet, L. Abe, F.-X. Schmider, J. Dejonghe, F. Martinache, É. Aristidi, É. Cottalorda, Y. Bresson, J.-P. Rivet, D. Vernet, F. Vakili

Proceedings Volume 12185, 121858R (2022) https://doi.org/10.1117/12.2643002

KEYWORDS: Jupiter, Adaptive optics, Mars, Wavefront sensors, Telescopes, Mirrors, Device simulation, Wavefronts, Observatories, Numerical modeling

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Proceedings Article | 26 August 2022 Presentation + Paper

Intensity interferometry at Calern and beyond: progress report

Nolan Matthews, Jean-Pierre Rivet, Mathilde Hugbart, Guillaume Labeyrie, Robin Kaiser, Olivier Lai, Farrokh Vakili, David Vernet, Julien Chabé, Clémont Courde, Nicolas Schuhler, Pierre Bourget, William Guerin

Proceedings Volume 12183, 121830G (2022) https://doi.org/10.1117/12.2628561

KEYWORDS: Telescopes, Interferometry, Stars, Optical filters, Picosecond phenomena, Visibility, Atmospheric Cherenkov telescopes, Polarization, Sensors, Observatories

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Proceedings Article | 26 August 2022 Presentation + Paper

Achieving diffraction limited imaging with an Imaging Air Cherenkov Telescope

Pierre-Marie Gori, Farrokh Vakili, Nolan Matthews, Jean-Pierre Rivet, William Guerin, Andrea Chiavassa, Mathilde Hugbart, Olivier Lai, Robin Kaiser

Proceedings Volume 12183, 121831W (2022) https://doi.org/10.1117/12.2625795

KEYWORDS: Atmospheric Cherenkov telescopes, Telescopes, Signal to noise ratio, Mirrors, Diffraction, Stars, Interferometry, Interferometers, Atmospheric turbulence

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Proceedings Article | 9 July 2018 Paper

Intensity interferometry revival on the Côte d’Azur

Olivier Lai, William Guerin, Farrokh Vakili, Robin Kaiser, Jean Pierre Rivet, Mathilde Fouché, Guillaume Labeyrie, Julien Chabé, Clément Courde, Etienne Samain, David Vernet

Proceedings Volume 10701, 1070121 (2018) https://doi.org/10.1117/12.2309491

KEYWORDS: Telescopes, Interferometry, Atmospheric Cherenkov telescopes, Signal to noise ratio, Sensors, Interferometers, Multimode fibers, Photonics

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Proceedings Article | 8 August 2016 Paper

SPEED design optimization via Fresnel propagation analysis

Mathilde Beaulieu, Lyu Abe, Patrice Martinez, Carole Gouvret, Julien Dejonghe, Oliver Preis, Farrokh Vakili

Proceedings Volume 9906, 99062X (2016) https://doi.org/10.1117/12.2232661

KEYWORDS: Image segmentation, Mirrors, Wavefronts, Deformable mirrors, Large telescopes, Image segmentation, Coronagraphy, Actuators, Computer simulations, Geometrical optics, Electroluminescent displays

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Proceedings Article | 4 August 2016 Paper

An overview of the mid-infrared spectro-interferometer MATISSE: science, concept, and current status

A. Matter, B. Lopez, P. Antonelli, M. Lehmitz, F. Bettonvil, U. Beckmann, S. Lagarde, W. Jaffe, R. Petrov, P. Berio, F. Millour, S. Robbe-Dubois, A. Glindemann, P. Bristow, M. Schoeller, T. Lanz, T. Henning, G. Weigelt, M. Heininger, S. Morel, P. Cruzalebes, K. Meisenheimer, R. Hofferbert, S. Wolf, Y. Bresson, T. Agocs, F. Allouche, J.-C. Augereau, G. Avila, C. Bailet, J. Behrend, G. van Belle, J.-P. Berger, R. van Boekel, P. Bourget, R. Brast, J.-M. Clausse, C. Connot, R. Conzelmann, G. Csepany, W. Danchi, M. Delbo, C. Dominik, A. van Duin, E. Elswijk, Y. Fantei, G. Finger, A. Gabasch, F. Gonté, U. Graser, F. Guitton, S. Guniat, M. De Haan, P. Haguenauer, H. Hanenburg, K.-H. Hofmann, M. Hogerheijde, R. ter Horst, J. Hron, C Hummel, J. Isderda, D. Ives, G. Jakob, A. Jasko, P. Jolley, S. Kiraly, J. Kragt, T. Kroener, G. Kroes, S. Kuindersma, L. Labadie, W. Laun, C. Leinert, J.-L. Lizon, C. Lucuix, A. Marcotto, F. Martinache, G. Martinot-Lagarde, N. Mauclert, L. Mehrgan, A. Meilland, M. Mellein, S. Menardi, A. Merand, U. Neumann, E. Nussbaum, S. Ottogalli, R. Palsa, J. Panduro, E. Pantin, I. Percheron, T. Phan Duc, J.-U. Pott, E. Pozna, R. Roelfsema, G. Rupprecht, D. Schertl, C. Schmidt, M. Schuil, A. Spang, J. Stegmeier, N. Tromp, F. Vakili, M. Vannier, K. Wagner, L. Venema, J. Woillez

Proceedings Volume 9907, 99070A (2016) https://doi.org/10.1117/12.2233052

KEYWORDS: Mid-IR, Interferometry, Telescopes, Signal detection, Sensors, Stars, Spectral resolution, Fourier transforms, L band, Cameras

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Proceedings Article | 4 August 2016 Paper

Grown-up stars physics with MATISSE

F. Millour, J. Hron, A. Chiavassa, G. Weigelt, A. Soulain, Z. Khorrami, A. Meilland, N. Nardetto, C. Paladini, A. Domiciano de Souza, G. Niccolini, K.-H. Hofmann, D. Schertl, P. Stee, P. Bendjoya, F. Thévenin, F. Vakili, P. Berio, T. Lanz, A. Matter, P. Cruzalèbes, R. Petrov, B. Lopez

Proceedings Volume 9907, 99073Q (2016) https://doi.org/10.1117/12.2232350

KEYWORDS: Stars, Physics, Image restoration, Stars, Physics, Image restoration, Infrared radiation, Interferometry, Visible radiation, K band, Beryllium, Adaptive optics, Spectroscopy

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Proceedings Article | 28 July 2014 Paper

Stable Imaging for Astronomy (SIA)

Mathilde Beaulieu, Sebastien Ottogalli, Olivier Preis, Yves Bresson, Jean-Pierre Rivet, Lyu Abe, Farrokh Vakili

Proceedings Volume 9147, 91477W (2014) https://doi.org/10.1117/12.2057529

KEYWORDS: Interferometers, Metrology, Temperature metrology, Environmental sensing, Thermal modeling, Astronomy, Mirrors, Silica, Astronomical imaging, Time metrology

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Proceedings Article | 26 September 2013 Paper

Sphere: complete laboratory performance and prediction for on-sky first light

Jean-François Sauvage, Jean-Luc Beuzit, Ronald Roelfsema, Markus Feldt, Kjetil Dohlen, David Mouillet, Pascal Puget, Francois Wildi, Lyu Abe, Andrea Baruffolo, Pierre Baudoz, Andreas Bazzon, Anthony Boccaletti, Tristan Buey, Marcel Carbillet, Julien Charton, Riccardo Claudi, Anne Costille, Alain Delboulbé, Silvano Desidera, Carsten Dominik, Mark Downing, Christophe Fabron, Philippe Feautrier, Enrico Fedrigo, Thierry Fusco, Enrico Giro, Laurence Gluck, Raffaele Gratton, Thomas Henning, Norbert Hubin, Markus Kasper, Anne-Marie Lagrange, Maud Langlois, David Le Mignant, Jean-Louis Lizon, Fabrice Madec, Yves Magnard, Patrice Martinez, Dino Mesa, Ole Möller-Nilsson, Thibaut Moulin, Claire Moutou, Alexey Pavlov, Denis Perret, Cyril Petit, Johan Pragt, Patrick Rabou, Sylvain Rochat, Bernardo Salasnich, Gérard Rousset, Hans-Martin Schmid, Arnaud Sevin, Christian Soenke, Eric Stadler, Marcos Suarez, Massimo Turatto, Stéphane Udry, Arthur Vigan, Farrokh Vakili, Gérard Zins, Alice Zurlo

Proceedings Volume 8864, 88640B (2013) https://doi.org/10.1117/12.2025562

KEYWORDS: Optical spheres, Coronagraphy, Turbulence, Exoplanets, Stars, Planets, Iterated function systems, Adaptive optics, Visible radiation, Polarimetry

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Proceedings Article | 24 September 2012 Paper

DiffRACT: differential remapped aperture coronagraphic telescope

F. Allouche, M. Hadjara, Y. Kok, F. Vakili, L. Abe, P. M. Gori

Proceedings Volume 8446, 84467E (2012) https://doi.org/10.1117/12.926022

KEYWORDS: Planets, Coronagraphy, Stars, Telescopes, Exoplanets, Prisms, Lenses, Spatial resolution, Numerical simulations, Atmospheric turbulence

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Proceedings Article | 12 September 2012 Paper

Perspective of imaging in the mid-infrared at the Very Large Telescope Interferometer

B. Lopez, S. Lagarde, P. Antonelli, W. Jaffe, R. Petrov, L. Venema, Sylvie Robbe-Dubois, F. Bettonvil, P. Berio, R. Navarro, U. Graser, U. Beckman, G. Weigelt, F. Vakili, T. Henning, J.-C. Gonzales, S. Wolf, C. Bailet, J. Behrend, Y. Bresson, O. Chesneau, J. Clausse, C. Connot, M. Dugué, Y. Fantei, E. Elswijk, H. Hanenburg, K. Hofmann, M. Heininger, R. ter Horst, J. Hron, J. Kragt, N. Tromp, T. Agocs, G. Kroes, W. Laun, Ch. Leinert, M. Lehmitz, A. Matter, J. Menut, F. Millour, U. Neumann, E. Nussbaum, S. Ottogalli, J.-U. Pott, F. Rigal, A. Roussel, D. Schertl, M. Vannier, K. Wagner, M. Mellein, T. Kroener, N. Mauclert, P. Girard, G. Lagarde, L. Mosoni, A. Jasko, A. Glindemann, T. Phan Duc, G. Finger, D. Ives, G. Jakob, I. Percheron, G. Avila, R. Palsa, Eszter Pozna, J. Lizon, Ch. Lucuix, S. Menardi, P. Haguenauer, P. Gitton, S. Morel, F. Gonté, P. Jolley, G. Rupprecht, P. Bourget, F. Delplancke, L. Mehrgan, J. Stegmeier, G. van Belle, A. Richichi, A. Moorwood

Proceedings Volume 8445, 84450R (2012) https://doi.org/10.1117/12.926238

KEYWORDS: Interferometry, Sensors, Visibility, Mid-IR, L band, Telescopes, Spectral resolution, Image restoration, Interferometers, Photometry

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Proceedings Article | 21 July 2010 Paper

APIC: Absolute Position Interfero Coronagraph for direct exoplanet detection: first laboratory results

Fatmé Allouche, Andreas Glindemann, Eric Aristidi, Farrokh Vakili

Proceedings Volume 7735, 773587 (2010) https://doi.org/10.1117/12.859672

KEYWORDS: Coronagraphy, Stars, Planets, Beam splitters, Wavefronts, Telescopes, Exoplanets, Interferometry, Mirrors, Exoplanetary science

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Proceedings Article | 20 August 2009 Paper

SPHERE: the VLT planet imager in the post FDR phase

Francois Wildi, Jean-Luc Beuzit, Markus Feldt, David Mouillet, Kjetil Dohlen, Pascal Puget, Andrea Baruffolo, Julien Charton, Pierre Baudoz, Anthony Boccaletti, Lyu Abe, Riccardo Claudi, Philippe Feautrier, Thierry Fusco, Raffaele Gratton, Norbert Hubin, Markus Kasper, Maud Langlois, Rainer Lenzen, Alexey Pavlov, Cyril Petit, Johan Pragt, Patrick Rabou, Ronald Roelfsema, Michel Saisse, Hans Martin Schmid, Eric Stadler, Claire Moutou, Massimo Turatto, Stephane Udry, Rens Waters, Thomas Henning, Anne-Marie Lagrange, Farrokh Vakili

Proceedings Volume 7440, 74400P (2009) https://doi.org/10.1117/12.826521

KEYWORDS: Optical spheres, Planets, Adaptive optics, Iterated function systems, Imaging systems, Coronagraphy, Stars, Polarimetry, Sensors, Exoplanets

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Proceedings Article | 28 July 2008 Paper

PropHAn: horizontal propagation sensor for interferometry at Dome C

Hervé Trinquet, Farrokh Vakili, Guillaume Petitjean, François Jeanneaux, Jean-Baptiste Daban, Jean Vernin

Proceedings Volume 7013, 70134J (2008) https://doi.org/10.1117/12.790966

KEYWORDS: Interferometry, Domes, Optical turbulence, Atmospheric propagation, Sensors, Interferometers, Telescopes, Wave propagation, Beam propagation method, Cameras

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Proceedings Article | 28 July 2008 Paper

IRAN: laboratory test bench for hypertelescope pupil-plane recombination

F. Allouche, F. Vakili, A. Glindemann, E. Aristidi, L. Abe, E. Fossat, R. Douet

Proceedings Volume 7013, 70133T (2008) https://doi.org/10.1117/12.788680

KEYWORDS: Telescopes, Lenses, Image quality, Convolution, Interferometers, Interferometry, Diffraction, Microscopes, Laser sources, Relays

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Proceedings Article | 25 July 2008 Paper

SPHERE: a planet finder instrument for the VLT

Jean-Luc Beuzit, Markus Feldt, Kjetil Dohlen, David Mouillet, Pascal Puget, Francois Wildi, Lyu Abe, Jacopo Antichi, Andrea Baruffolo, Pierre Baudoz, Anthony Boccaletti, Marcel Carbillet, Julien Charton, Riccardo Claudi, Mark Downing, Christophe Fabron, Philippe Feautrier, Enrico Fedrigo, Thierry Fusco, Jean-Luc Gach, Raffaele Gratton, Thomas Henning, Norbert Hubin, Franco Joos, Markus Kasper, Maud Langlois, Rainer Lenzen, Claire Moutou, Alexey Pavlov, Cyril Petit, Johan Pragt, Patrick Rabou, Florence Rigal, Ronald Roelfsema, Gérard Rousset, Michel Saisse, Hans-Martin Schmid, Eric Stadler, Christian Thalmann, Massimo Turatto, Stéphane Udry, Farrokh Vakili, Rens Waters

Proceedings Volume 7014, 701418 (2008) https://doi.org/10.1117/12.790120

KEYWORDS: Planets, Optical spheres, Stars, Coronagraphy, Sensors, Iterated function systems, Adaptive optics, Near infrared, Polarimetry, Calibration

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Proceedings Article | 23 July 2008 Paper

Apodized Lyot coronagraph for VLT-SPHERE: laboratory tests and performances of a first prototype in the visible

Géraldine Guerri, Sylvie Robbe-Dubois, Jean-Baptiste Daban, Lyu Abe, Richard Douet, Philippe Bendjoya, Farrokh Vakili, Marcel Carbillet, Jean-Luc Beuzit, Pascal Puget, Kjetil Dohlen, David Mouillet

Proceedings Volume 7014, 70143J (2008) https://doi.org/10.1117/12.789688

KEYWORDS: Coronagraphy, Prototyping, Neodymium, Reflectivity, Astronomy, High dynamic range imaging, Numerical simulations, Manufacturing

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Proceedings Article | 24 September 2007 Paper

The SPHERE exoplanet imager: status report at PDR

Francois Wildi, Jean-Luc Beuzit, Markus Feldt, David Mouillet, Kjetil Dohlen, Pascal Puget, Andrea Baruffolo, Julien Charton, Jacopo Antichi, Pierre Baudoz, Anthony Boccaletti, Marcel Carbillet, Riccardo Claudi, Philippe Feautrier, Enrico Fedrigo, Thierry Fusco, Raffaele Gratton, Norbert Hubin, Markus Kasper, Maud Langlois, Rainer Lenzen, Claire Moutou, Alexey Pavlov, Cyril Petit, Johan Pragt, Patrick Rabou, Ronald Roelfsema, Michel Saisse, Hans-Martin Schmid, Eric Stadler, Christian Thalmann, Massimo Turatto, Stéphane Udry, Rens Waters, Thomas Henning, Anne-Marie Lagrange, Farrokh Vakili

Proceedings Volume 6691, 66910L (2007) https://doi.org/10.1117/12.734785

KEYWORDS: Optical spheres, Stars, Planets, Coronagraphy, Iterated function systems, Sensors, Imaging spectroscopy, Near infrared, Adaptive optics, Polarization

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Proceedings Article | 29 June 2006 Paper

Study of the scientific potential of a three 40 cm telescopes interferometer at Dome C

B. Valat, F. Schmider, B. Lopez, R. Petrov, M. Vannier, F. Millour, F. Vakili

Proceedings Volume 6268, 62684C (2006) https://doi.org/10.1117/12.671411

KEYWORDS: Telescopes, Interferometers, Planets, Stars, Signal to noise ratio, Jupiter, Atmospheric sciences, Domes, Device simulation, Prototyping

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Proceedings Article | 28 June 2006 Paper

MATISSE: a four beam combiner in the mid-infrared for the VLTI

S. Lagarde, B. Lopez, P. Antonelli, U. Beckman, J. Behrend, Y. Bresson, O. Chesneau, M. Dugué, A. Glazenborg, U. Graser, K. Hofmann, W. Jaffe, Ch. Leinert, F. Millour, J. Menut, R. Petrov, T. Ratzka, G. Weigelt, S. Wolf, P. Abraham, C. Connot, T. Henning, M. Heininger, Y. Hugues, S. Kraus, W. Laun, A. Matter, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosoni, S. Robbe-Dubois, A. Roussel, D. Schertl, F. Vakili, K. Wagner, L.B.F.M. Waters

Proceedings Volume 6268, 62683M (2006) https://doi.org/10.1117/12.671690

KEYWORDS: Sensors, Signal to noise ratio, Telescopes, Mid-IR, Spectral resolution, Interferometers, Spectroscopes, Phase measurement, Interferometry, Mirrors

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Proceedings Article | 28 June 2006 Paper

CORONA: progress report on the Dome C prototype APKC coronagraph

G. Guerri, J. Daban, F. Vakili, L. Abe, E. Aristidi, K. Agabi, P. Bendjoya, J. Sarry, F. Schmider, B. Lopez

Proceedings Volume 6269, 62695D (2006) https://doi.org/10.1117/12.671399

KEYWORDS: Coronagraphy, Telescopes, Stars, Cameras, Prototyping, Domes, Manufacturing, Numerical simulations, Diffraction, Astronomy

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Proceedings Article | 27 June 2006 Paper

ALADDIN: an optimized nulling ground-based demonstrator for Darwin

V. Coudé du Foresto, O. Absil, M. Swain, F. Vakili, M. Barillot

Proceedings Volume 6268, 626810 (2006) https://doi.org/10.1117/12.672370

KEYWORDS: Interferometers, L band, Nulling interferometry, Interferometry, Infrared radiation, Space operations, Stars, Turbulence, Astronomy, Calibration

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Proceedings Article | 27 June 2006 Paper

MATISSE: perspective of imaging in the mid-infrared at the VLTI

B. Lopez, S. Wolf, S. Lagarde, P. Abraham, P. Antonelli, J. Augereau, U. Beckman, J. Behrend, N. Berruyer, Y. Bresson, O. Chesneau, J. Clausse, C. Connot, K. Demyk, W. Danchi, M. Dugué, S. Flament, A. Glazenborg, U. Graser, T. Henning, K. Hofmann, M. Heininger, Y. Hugues, W. Jaffe, S. Jankov, S. Kraus, W. Laun, Ch. Leinert, H. Linz, Ph. Mathias, K. Meisenheimer, A. Matter, J. Menut, F. Millour, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosonic, R. Petrov, T. Ratzka, S. Robbe-Dubois, A. Roussel, D. Schertl, F.-X. Schmider, B. Stecklum, E. Thiebaut, F. Vakili, K. Wagner, L. B. F. M. Waters, G. Weigelt

Proceedings Volume 6268, 62680Z (2006) https://doi.org/10.1117/12.671636

KEYWORDS: Mid-IR, Planets, Stars, Spectral resolution, Interferometry, Spectroscopy, Signal to noise ratio, Visibility, Spatial resolution, Sensors

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Proceedings Article | 27 June 2006 Paper

Infra arcsec, infra mJy astronomy: exoplanetary scene models for exo-Earth detection through IR interferometric nulling

Adrian Belu, Marc Ollivier, Guilaine Lagache, Olivier Germain, Stephen Dunne, Stephane Bonnot, Didier Miras, Rodolphe Krawczyk, Roland den Hartog, Malcolm Fridlund, Christian Erd, Farrokh Vakili

Proceedings Volume 6268, 62680C (2006) https://doi.org/10.1117/12.671674

KEYWORDS: Stars, Planets, Nulling interferometry, Interferometry, Data modeling, Exoplanets, Galactic astronomy, Astronomy, Infrared astronomy, Infrared detectors

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Proceedings Article | 23 June 2006 Paper

Recent progress and future prospects of the GI2T interferometer

D. Mourard, A. Blazit, D. Bonneau, J. Chevassut, J. Clausse, J. Le Bouquin, J. Maire, G. Merlin, K. Rousselet-Perraut, J. Borgnino, N. Nardetto, F. Patru, X. Rondeau, P. Stee, I. Tallon-Bosc, E. Thiébaut, F. Vakili, A. Ziad

Proceedings Volume 6268, 626807 (2006) https://doi.org/10.1117/12.669899

KEYWORDS: Interferometers, Polarization, Visibility, Polarimetry, Spectrographs, Cameras, Photon counting, Sensors, Interferometry, Spatial resolution

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