Dr. Karl-Heinz Hofmann Profile

Dr. Karl-Heinz Hofmann

Staff Astronomer at Max-Planck Institute for Radioastronomy

SPIE Involvement:

Author

Publications (63)

Proceedings Article | 30 December 2020 Presentation + Paper

Presentation + Paper

Commissioning MATISSE: operation and performances

Romain Petrov, Fatmé Allouche, Alexis Matter, Anthony Meilland, Stéphane Lagarde, Philippe Berio, Pierre Cruzalèbes, Florentin Millour, Sylvie Robbe-Dubois, Walter Jaffe, Karl-Heinz Hofmann, Jozsef Varga, Dieter Schertl, Leonard Burtscher, Klaus Meisenheimer, Alain Chelli, Gerard Zins, Julien Woillez, Markus Schöller, Bruno Lopez

Proceedings Volume 11446, 114460L (2020) https://doi.org/10.1117/12.2562569

KEYWORDS: Interferometry, Visibility, Sensors, Phase shift keying, Spatial filters, Telescopes, Modulation, Phase measurement, K band, Physics

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

The installation and ongoing commissioning of the MATISSE mid-infrared interferometer at the ESO Very Large Telescope Observatory

B. Lopez, S. Lagarde, A. Matter, T. Agocs, F. Allouche, P. Antonelli, J.-C. Augereau, C. Bailet, P. Berio, F. Bettonvil, U. Beckmann, R. van Boekel, Y. Bresson, P. Bristow, P. Cruzalebes, M. Delbo, C. Dominik, E. Elswijk, Y. Fantei, A. Glindemann, M. Heininger, K.-H. Hofmann, M. Hogerheijde, J. Hron, W. Jaffe, G. Kroes, W. Laun, M. Lehmitz, A. Meilland, K. Meisenheimer, F. Millour, S. Morel, U. Neumann, E. Pantin, R. Petrov, S. Robbe-Dubois, D. Schertl, M. Schoeller, S. Wolf, G. Zins, T. Henning, Ph. Stee, G. Weigelt

Proceedings Volume 10701, 107010Z (2018) https://doi.org/10.1117/12.2313388

KEYWORDS: Interferometry, Spectral resolution, Sensors, Mid-IR, Visibility, Stars, Imaging systems, Interferometers, Photometry, Observatories

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Proceedings Article | 4 August 2016 Paper

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

Paper

The 2016 interferometric imaging beauty contest

J. Sanchez-Bermudez, E. Thiébaut, K.-H. Hofmann, M. Heininger, D. Schertl, G. Weigelt, F. Millour, A. Schutz, A. Ferrari, M. Vannier, D. Mary, J. Young

Proceedings Volume 9907, 99071D (2016) https://doi.org/10.1117/12.2231982

KEYWORDS: Image restoration, Interferometry, Optical interferometry, Image restoration, Reconstruction algorithms, Device simulation, Stars, Visibility, Image quality, Image processing, Spatial frequencies

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Proceedings Article | 4 August 2016 Paper

Paper

Imaging capabilities of the VLTI/MATISSE spectro-interferometric instrument

J. Sanchez-Bermudez, J.-U. Pott, R. van Boekel, T. Henning, F. Baron, A. Matter, B. Lopez, F. Millour, G. Weigelt, K.-H. Hofmann, D. Schertl

Proceedings Volume 9907, 99070B (2016) https://doi.org/10.1117/12.2232308

KEYWORDS: Image restoration, Interferometry, Interferometers, Mid-IR, Visibility, Image processing, Spatial frequencies, Data modeling, Image quality, Signal to noise ratio

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Proceedings Article | 4 August 2016 Paper

Paper

Data reduction for the MATISSE instrument

F. Millour, P. Berio, M. Heininger, K.-H. Hofmann, D. Schertl, G. Weigelt, F. Guitton, W. Jaffe, U. Beckmann, R. Petrov, F. Allouche, S. Robbe-Dubois, S. Lagarde, A. Soulain, A. Meilland, A. Matter, P. Cruzalèbes, B. Lopez

Proceedings Volume 9907, 990723 (2016) https://doi.org/10.1117/12.2232283

KEYWORDS: Modulation, Calibration, Sensors, Visibility, Interferometry, Telescopes, Distortion, Space telescopes, Atmospheric optics, Colorimetry

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Proceedings Article | 4 August 2016 Paper

Paper

Sharp images of WR104

A. Soulain, F. Millour, B. Lopez, E. Lagadec, A. Matter, K.-H. Hofmann

Proceedings Volume 9907, 99073R (2016) https://doi.org/10.1117/12.2232384

KEYWORDS: Stars, Interferometry, Infrared radiation, Data modeling, Interferometry, Optical spheres, Binary data, Deconvolution, Point spread functions, Spatial frequencies, Visibility

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Proceedings Article | 4 August 2016 Paper

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 | 26 July 2016 Paper

Paper

Science with MATISSE

Sebastian Wolf, Bruno Lopez, Jean-Charles Augereau, Marco Delbo, Carsten Dominik, Thomas Henning, Karl-Heinz Hofmann, Michiel Hogerheijde, Josef Hron, Walter Jaffe, Thierry Lanz, Klaus Meisenheimer, Florentin Millour, Eric Pantin, Roman Petrov, Dieter Schertl, Roy van Boekel, Gerd Weigelt, Andrea Chiavassa, Attila Juhasz, Alexis Matter, Anthony Meilland, Nicolas Nardetto, Claudia Paladini

Proceedings Volume 9907, 99073S (2016) https://doi.org/10.1117/12.2232835

KEYWORDS: Stars, Mid-IR, Spectral resolution, Interferometry, Asteroids, Visibility, Planets, Binary data, Carbon monoxide, Spatial resolution

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Proceedings Article | 26 July 2016 Paper

Paper

Image reconstruction method IRBis for optical/infrared long-baseline interferometry

Karl-Heinz Hofmann, Matthias Heininger, Dieter Schertl, Gerd Weigelt, Florentin Millour, Philippe Berio

Proceedings Volume 9907, 99073H (2016) https://doi.org/10.1117/12.2232369

KEYWORDS: Image restoration, Data modeling, Interferometry, Visibility, Binary data, Image quality, Reconstruction algorithms, Phase measurement, Computer simulations, Image processing

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IRBis is an image reconstruction method for optical/infrared long-baseline interferometry. IRBis can reconstruct images from (a) measured visibilities and closure phases, or from (b) measured complex visibilities (i.e. the Fourier phases and visibilities). The applied optimization routine ASA CG is based on conjugate gradients. The method allows the user to implement different regularizers, as for example, maximum entropy, smoothness, total variation, etc., and apply residual ratios as an additional metric for goodness-of-fit. In addition, IRBis allows the user to change the following reconstruction parameters: (a) FOV of the area to be reconstructed, (b) the size of the pixel-grid used, (c) size of a binary mask in image space allowing reconstructed intensities < 0 within the binary mask only, (d) the strength of the regularization, etc. The two main reconstruction parameters are the size of the binary mask in image space (c) and the strength of the regularization (d). Several values of these two parameters are tested within the algorithm. The quality of the different reconstructions obtained is roughly estimated by evaluation of the differences between the measured data and the reconstructed image (using the reduced χ² values and the residual ratios). The best-quality reconstruction and a few reconstructions sorted according to their quality are provided to the user as resulting reconstructions. We describe the theory of IRBis and will present several applications to simulated interferometric data and data of real astronomical objects: (a) We have investigated image reconstruction experiments of MATISSE target candidates by computer simulations. We have modeled gaps in a disk of a young stellar object and have simulated interferometric data (squared visibilities and closure phases) with a signal-to-noise ratio as expected for MATISSE observations. We have performed image reconstruction experiments with this model for different flux levels of the target and different amount of observing time, that is, with different uv coverages. As expected, the quality of the reconstructions clearly depends on the flux of the source and the completeness of the uv coverage. (b) We also discuss reconstructions of the Luminous Blue Variable η Carinae obtained from AMBER observations in the high spectral resolution mode in the K band. The images were reconstruction (1) using the closure phases and (2) using the absolute phases derived from the measured wavelength-differential phases and the closure phase reconstruction in the continuum.

Proceedings Article | 24 July 2014 Paper

Paper

MATISSE status report and science forecast

B. Lopez, S. Lagarde, W. Jaffe, R. Petrov, M. Schöller, P. Antonelli, U. Beckman, Ph. Bério, F. Bettonvil, U. Graser, F. Millour, S. Robbe-Dubois, L. Venema, S. Wolf, P. Bristow, A. Glindemann, J.-C. Gonzalez, Th. Lanz, T. Henning, G. Weigelt, T. Agócs, J.-C. Augereau, G. Ávila, C. Bailet, J. Behrend, J.-P. Berger, Roy von Boekel, S. Bonhomme, P. Bourget, R. Brast, Y. Bresson, J. Clausse, O. Chesneau, G. Csépány, C. Connot, A. Crida, W. Danchi, M. Delbo , F. Delplancke, C. Dominik, M. Dugué, E. Elswijk, Y. Fanteï, G. Finger, A. Gabasch, P. Girard, V. Girault, P. Gitton, A. Glazenborg, F. Gonté, F. Guitton, S. Guniat, M. De Haan, P. Haguenauer, H. Hanenburg, M. Heininger, K.-H. Hofmann, M. Hogerheijde, R. ter Horst, J. Hron, Y. Hughes, D. Ives, G. Jakob, A. Jaskó, P. Jolley, J. Kragt, R. Köhler, T. Kroener, G. Kroes, L. Labadie, W. Laun, M. Lehmitz, Ch. Leinert, J. Lizon, Ch. Lucuix, A. Marcotto, F. Martinache, A. Matter, G. Martinot-Lagarde, N. Mauclert, L. Mehrgan, A. Meilland, M. Mellein, S. Ménardi, J. Menut, K. Meisenheimer, S. Morel, L. Mosoni, R. Navarro, U. Neumann, E. Nussbaum, S. Ottogalli, R. Palsa, J. Panduro, E. Pantin, I. Percheron, T. Phan Duc, J.-U. Pott, Eszter Pozna, F. Przygodda, A. Richichi, F. Rigal, G. Rupprecht, D. Schertl, J. Stegmeier, L. Thiam, N. Tromp, M. Vannier, F. Vakili, G. van Belle, K. Wagner, J. Woillez

Proceedings Volume 9146, 91460M (2014) https://doi.org/10.1117/12.2056419

KEYWORDS: Interferometry, Sensors, Mid-IR, Stars, Telescopes, Visibility, Planets, Spectral resolution, Photometry, Fourier transforms

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Proceedings Article | 24 July 2014 Paper

Paper

A low-noise HAWAII detector system and new cold optics for the CLASSIC/CLIMB beam combiner instrument of the CHARA array

Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Eddy Nußbaum, Dieter Schertl, Walter Solscheid, Theo ten Brummelaar, Nils Turner, Gerd Weigelt

Proceedings Volume 9146, 91461W (2014) https://doi.org/10.1117/12.2055850

KEYWORDS: Sensors, Electronics, Staring arrays, Analog electronics, Digital filtering, Prisms, Signal processing, Radio astronomy, Signal detection, Electrons

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Proceedings Article | 24 July 2014 Paper

Paper

Fizeau interferometric imaging of Io volcanism with LBTI/LMIRcam

J. Leisenring, P. Hinz, M. Skrutskie, A. Skemer, C. Woodward, C. Veillet, C. Arcidiacono, V. Bailey, M. Bertero, P. Boccacci, A. Conrad, K. de Kleer, I. de Pater, D. Defrère, J. Hill, K.-H. Hofmann, L. Kaltenegger, A. La Camera, M. Nelson, D. Schertl, J. Spencer, G. Weigelt, J. Wilson

Proceedings Volume 9146, 91462S (2014) https://doi.org/10.1117/12.2057290

KEYWORDS: Information operations, Point spread functions, Interferometry, Telescopes, Deconvolution, Reconstruction algorithms, Spatial resolution, Image restoration, Mirrors, Image resolution

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Proceedings Article | 24 July 2014 Paper

Paper

The 2014 interferometric imaging beauty contest

John Monnier, Jean-Philippe Berger, Jean-Baptiste Le Bouquin, Peter Tuthill, Markus Wittkowski, Rebekka Grellmann, André Müller, Sridhar Renganswany, Christian Hummel, Karl-Heinz Hofmann, Dieter Schertl, Gerd Weigelt, John Young, David Buscher, Joel Sanchez-Bermudez, Antxon Alberdi, Rainer Schoedel, Rainer Köhler, Ferréol Soulez, Éric Thiébaut, Jacques Kluska, Fabien Malbet, Gilles Duvert, Stefan Kraus, Brian Kloppenborg, Fabien Baron, Willem-Jan de Wit, Thomas Rivinius, Antoine Merand

Proceedings Volume 9146, 91461Q (2014) https://doi.org/10.1117/12.2057312

KEYWORDS: Stars, Image restoration, Interferometry, Image processing, Visibility, Reconstruction algorithms, Telescopes, Data modeling, Spatial resolution, Optical interferometry

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Proceedings Article | 21 July 2014 Paper

Paper

High contrast imaging at the LBT: the LEECH exoplanet imaging survey

Andrew Skemer, Philip Hinz, Simone Esposito, Michael Skrutskie, Denis Defrère, Vanessa Bailey, Jarron Leisenring, Daniel Apai, Beth Biller, Mickaël Bonnefoy, Wolfgang Brandner, Esther Buenzli, Laird Close, Justin Crepp, Robert De Rosa, Silvano Desidera, Josh Eisner, Jonathan Fortney, Thomas Henning, Karl-Heinz Hofmann, Taisiya Kopytova, Anne-Lise Maire, Jared Males, Rafael Millan-Gabet, Katie Morzinski, Apurva Oza, Jenny Patience, Abhijith Rajan, George Rieke, Dieter Schertl, Joshua Schlieder, Kate Su, Amali Vaz, Kimberly Ward-Duong, Gerd Weigelt, Charles Woodward, Neil Zimmerman

Proceedings Volume 9148, 91480L (2014) https://doi.org/10.1117/12.2057277

KEYWORDS: Planets, Stars, Exoplanets, Telescopes, Adaptive optics, Imaging systems, Mirrors, Cameras, Wavefront sensors, Interferometers

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SPIE Journal Paper | 6 February 2013

LINC-NIRVANA for the large binocular telescope: setting up the world’s largest near infrared binoculars for astronomy

Ralph Hofferbert, Harald Baumeister, Thomas Bertram, Jürgen Berwein, Peter Bizenberger, Armin Böhm, Michael Böhm, José Luis Borelli, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Roman Follert, Thomas Herbst, Armin Huber, Frank Kittmann, Martin Kürster, Werner Laun, Ulrich Mall, Daniel Meschke, Lars Mohr, Vianak Naranjo, Aleksei Pavlov, Jorg-Uwe Pott, Hans-Walter Rix, Ralf-Rainer Rohloff, Eva Schinnerer, Clemens Storz, Jan Trowitzsch, Zhaojun Yan, Xianyu Zhang, Andreas Eckart, Matthew Horrobin, Steffen Rost, Christian Straubmeier, Imke Wank, Jens Zuther, Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Tim Kroner, Edmund Nussbaum, Dieter Schertl, Gerd Weigelt, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Demetrio Magrin, Luca Marafatto, Roberto Ragazzoni, Valentina Viotto, Carmelo Arcidiacono, Giovanni Bregoli, Paolo Ciliegi, Giuseppe Cosentino, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Francesco D'Alessio, Gianluca Li Causi, Dario Lorenzetti, Fabrizio Vitali, Mario Bertero, Patrizia Boccacci, Andrea La Camera

OE, Vol. 52, Issue 08, 081602, (February 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.8.081602

KEYWORDS: Telescopes, Sensors, Mirrors, Interferometry, Near infrared, Adaptive optics, Interfaces, Cameras, Optical engineering, Astronomy

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Proceedings Article | 24 October 2012 Paper

Paper

LINC-NIRVANA for the LBT: setting up the world's largest NIR binoculars for astronomy

Ralph Hofferbert, Harald Baumeister, Thomas Bertram, Jürgen Berwein, Peter Bizenberger, Armin Böhm, Michael Böhm, José Luis Borelli, Matthieu Brangier, Florian Briegel, Albert Conrad, Fulvio De Bonis, Roman Follert, Tom Herbst, Armin Huber, Frank Kittmann, Martin Kürster, Werner Laun, Ulrich Mall, Daniel Meschke, Lars Mohr, Vianak Naranjo, Aleksei Pavlov, Jörg-Uwe Pott, Hans-Walter Rix, Ralf-Rainer Rohloff, Eva Schinnerer, Clemens Storz, Jan Trowitzsch, Zhaojun Yan, Xianyu Zhang, Andreas Eckart, Matthew Horrobin, Steffen Rost, Christian Straubmeier, Imke Wank, Jens Zuther, Udo Beckmann, Claus Connot, Matthias Heininger, Karl-Heinz Hofmann, Tim Kröner, Eddy Nussbaum, Dieter Schertl, Gerd Weigelt, Maria Bergomi, Alessandro Brunelli, Marco Dima, Jacopo Farinato, Demetrio Magrin, Luca Marafatto, Roberto Ragazzoni, Valentina Viotto, Carmelo Arcidiacono, Giovanni Bregoli, Paolo Ciliegi, Guiseppe Cosentino, Emiliano Diolaiti, Italo Foppiani, Matteo Lombini, Laura Schreiber, Francesco D'Alessio, Gianluca Li Causi, Dario Lorenzetti, Fabrizio Vitali, Mario Bertero, Patrizia Boccacci, Andrea La Camera

Proceedings Volume 8511, 85110A (2012) https://doi.org/10.1117/12.928284

KEYWORDS: Telescopes, Mirrors, Sensors, Interferometry, Cameras, Adaptive optics, Near infrared, Stars, Imaging systems, Interfaces

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Proceedings Article | 12 September 2012 Paper

Paper

The 2012 interferometric imaging beauty contest

Fabien Baron, William Cotton, Peter Lawson, Steve Ridgway, Alicia Aarnio, John Monnier, Karl-Heinz Hofmann, Dieter Schertl, Gerd Weigelt, Eric Thiébaut, Férréol Soulez, David Mary, Florentin Millour, Martin Vannier, John Young, Nicholas Elias, Henrique Schmitt, Sridharan Rengaswamy

Proceedings Volume 8445, 84451E (2012) https://doi.org/10.1117/12.924907

KEYWORDS: Visibility, Aluminium phosphide, Data modeling, Interferometry, Stars, Image restoration, Reconstruction algorithms, Infrared imaging, Signal to noise ratio, Spatial frequencies

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Proceedings Article | 12 September 2012 Paper

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 | 22 July 2010 Paper

Paper

First results from VLTI near-infrared interferometry on high-mass young stellar objects

Stefan Kraus, Karl-Heinz Hofmann, Karl Menten, Dieter Schertl, Gerd Weigelt, Friedrich Wyrowski, Anthony Meilland, Karine Perraut, Romain Petrov, Sylvie Robbe-Dubois, Peter Schilke, Leonardo Testi

Proceedings Volume 7734, 773408 (2010) https://doi.org/10.1117/12.858285

KEYWORDS: Stars, Interferometry, Data modeling, Visibility, Infrared radiation, Telescopes, Infrared technology, Synthetic apertures, Spatial resolution, K band

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Proceedings Article | 28 July 2008 Paper

Paper

Mid-infrared view of cool evolved stars with the Very Large Telescope Interferometer

Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann, Gerd Weigelt, Markus Wittkowski

Proceedings Volume 7013, 70134M (2008) https://doi.org/10.1117/12.788775

KEYWORDS: Stars, Silicates, Carbon, Mid-IR, Visibility, Large telescopes, Interferometers, Solids, Interferometry, Diamond

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Proceedings Article | 28 July 2008 Paper

Paper

Aperture-synthesis imaging with the mid-infrared instrument MATISSE

Karl-Heinz Hofmann, Matthias Heininger, Walter Jaffe, Stefan Kraus, Bruno Lopez, Florentin Millour, Dieter Schertl, Gerd Weigelt, Sebastian Wolf

Proceedings Volume 7013, 70133Y (2008) https://doi.org/10.1117/12.788904

KEYWORDS: Signal to noise ratio, Visibility, Interferometry, Image restoration, Astatine, Photons, Reconstruction algorithms, Mid-IR, Calibration, Image resolution

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Proceedings Article | 28 July 2008 Paper

Paper

Science case for 1 mas spectro-imagining in the near-infrared

Paulo Garcia, Jean-Philippe Berger, Alessandro Marconi, Alexander Krivov, Andrea Chiavassa, Bernard Aringer, Brunella Nisini, Denis Defrére, Dimitri Mawet, Dieter Schertl, Eric Tatuli, Eric Thiébaut, Fabien Baron, Fabien Malbet, Gaspard Duchéne, Gerd Weigelt, Gilles Duvert, Gilles Henri, Hubert Klahr, Jean Surdej, Jean-Charles Augereau, Jean-François Claeskens, John Young, Josef Hron, Karine Perraut, Karl-Heinz Hofmann, Leonardo Testi, Margarida Cunha, Mercedes Filho, Michaël De Becker, Olivier Absil, Olivier Chesneau, Pierre Collette, Pierre-Olivier Petrucci, Ralph Neuhaeuser, Romano Corradi, Sónia Antón, Sebastian Wolf, Sebastian Hoenig, Stephanie Renard, Thierry Forveille, Thomas Beckert, Thomas Lebzelter, Tim Harries, Virginie Borkowski, Xavier Bonfils

Proceedings Volume 7013, 70134N (2008) https://doi.org/10.1117/12.789216

KEYWORDS: Stars, Telescopes, Spatial resolution, Planets, Galactic astronomy, Adaptive optics, Spectral resolution, Visibility, Interferometry, High dynamic range imaging

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We present the work developed within the science team of the Very Large Telescope Interferometer Spectro-Imager (VSI) during the Phase A studies. VSI aims at delivering ~ 1 milliarcsecond resolution data cubes in the near-infrared, with several spectral resolutions up to 12 000, by combining up to 8 VLTI telescopes. In the design of an instrument, the science case plays a central role by supporting the instrument construction decision, defining the top-level requirements and balancing design options. The overall science philosophy of VSI was that of a general user instrument serving a broad community. The science team addressed themes which included several areas of astrophysics and illustrated specific modes of operation of the instrument: a) YSO disks and winds; b) Multiplicity of young stars; c) Exoplanets; d) Debris disks; e) Stellar surface imaging; f) The environments of evolved stars; g) AGN tori; h) AGN's Broad Line Region; i) Supermassive black-holes; and j) Microlensing. The main conclusions can be summarized as follows: a) The accessible targets and related science are extremely sensitive to the instrument limiting magnitude; the instrument should be optimized for sensitivity and have its own fringe tracker. b) Most of the science cases are readily achievable with on-axis fringe tracking, off-axis fringe tracking enabling extra science. c) In most targets (YSOs, evolved stars and AGNs), the interpretation and analysis of circumstellar/nuclear dust morphology requires direct access to the gas via spectral resolved studies of emission lines, requiring at least a spectral resolution of 2 500. d) To routinely deliver images at the required sensitivity, the number of telescopes in determinant, with 6 telescopes being favored. e) The factorial increase in the number of closure phases and visibilities, gained in a single observation, makes massive surveys of parameters and related science for the first time possible. f) High dynamic range imaging and very high dynamic range differential closure phase are possible allowing the study of debris disks and characterization of pegasides. g) Spectro-imaging in the near-infrared is highly complementary to ALMA, adaptive optics and interferometric imaging in the thermal infrared.

Proceedings Article | 28 July 2008 Paper

Paper

MATISSE: concept analysis

S. Lagarde, B. Lopez, R. G. Petrov, K. H. Hofmann, S. Kraus, W. Jaffe, P. Antonelli, Y. Bresson, Ch. Leinert, A. Matter

Proceedings Volume 7013, 701332 (2008) https://doi.org/10.1117/12.789391

KEYWORDS: Signal to noise ratio, Mid-IR, Interferometry, Sensors, Telescopes, Bismuth, Photometry, Contamination, Spectroscopy, Interferometers

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Proceedings Article | 28 July 2008 Paper

Paper

VLTI-AMBER observations of Eta Carinae with the FINITO fringe tracker and spectral resolution 12000

Gerd Weigelt, Olivier Chesneau, Thomas Driebe, Renaud Foy, Didier Fraix-Burnet, Jose Groh, Karl-Heinz Hofmann, Stefan Kraus, Fabien Malbet, Alessandro Marconi, Philippe Mathias, Florentin Millour, Jean-Louis Monin, Romain Petrov, Frederik Rantakyrö, Andrea Richichi, Dieter Schertl, Markus Schöller, Philippe Stee, Leonardo Testi, Markus Wittkowski

Proceedings Volume 7013, 701303 (2008) https://doi.org/10.1117/12.796204

KEYWORDS: Visibility, Bromine, Spectral resolution, Phase measurement, Spectroscopy, Interferometry, Stars, Speckle, Telescopes, Binary data

Read Abstract +

Proceedings Article | 28 July 2008 Paper

Paper

2008 imaging beauty contest

William Cotton, John Monnier, Fabien Baron, Karl-Heinz Hofmann, Stefan Kraus, Gerd Weigelt, Sridharan Rengaswamy, Eric Thiébaut, Peter Lawson, Walter Jaffe, Christian Hummel, Tom Pauls, Henrique Schmitt, Peter Tuthill, John Young

Proceedings Volume 7013, 70131N (2008) https://doi.org/10.1117/12.788903

KEYWORDS: Data modeling, K band, Interferometry, Image restoration, Reconstruction algorithms, Visibility, Stars, Phase measurement, Image quality, Astronomical imaging

Read Abstract +

Proceedings Article | 28 July 2008 Paper

Paper

Infrared spectro-interferometry of YSOs

Stefan Kraus, Karl-Heinz Hofmann, Keiichi Ohnaka, Thomas Preibisch, Gerd Weigelt

Proceedings Volume 7013, 70130R (2008) https://doi.org/10.1117/12.789219

KEYWORDS: Stars, Visibility, Interferometry, Infrared radiation, Calibration, Near infrared, Infrared spectroscopy, Beryllium, Bromine, Binary data

Read Abstract +

Proceedings Article | 28 July 2008 Paper

Paper

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

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

Proceedings Volume 7013, 70132B (2008) https://doi.org/10.1117/12.789412

KEYWORDS: Mid-IR, Planets, Stars, Interferometry, Spectral resolution, Spectroscopy, Mirrors, Telescopes, Sensors, Observatories

Read Abstract +

Proceedings Article | 28 July 2008 Paper

Paper

VSI: the VLTI spectro-imager

F. Malbet, D. Buscher, G. Weigelt, P. Garcia, M. Gai, D. Lorenzetti, J. Surdej, J. Hron, R. Neuhäuser, P. Kern, L. Jocou, J.-P. Berger, O. Absil, U. Beckmann, L. Corcione, G. Duvert, M. Filho, P. Labeye, E. Le Coarer, G. Li Causi, J. Lima, K. Perraut, E. Tatulli, E. Thiébaut, J. Young, G. Zins, A. Amorim, B. Aringer, T. Beckert, M. Benisty, X. Bonfils, A. Cabral, A. Chelli, O. Chesneau, A. Chiavassa, R. Corradi, M. De Becker, A. Delboulbé, G. Duchêne, T. Forveille, C. Haniff, E. Herwats, K.-H. Hofmann, J.-B. Le Bouquin, S. Ligori, D. Loreggia, A. Marconi, A. Moitinho, B. Nisini, P.-O. Petrucci, J. Rebordao, R. Speziali, L. Testi, F. Vitali

Proceedings Volume 7013, 701329 (2008) https://doi.org/10.1117/12.789710

KEYWORDS: Telescopes, Stars, Spectral resolution, Spatial resolution, Interferometry, Integrated optics, Space telescopes, Visibility, Image restoration, Signal to noise ratio

Read Abstract +

The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-infrared images at angular resolutions down to 1.1 milliarcsecond and spectral resolutions up to R = 12000. Targets as faint as K = 13 will be imaged without requiring a brighter nearby reference object; fainter targets can be accessed if a suitable reference is available. The unique combination of high-dynamic-range imaging at high angular resolution and high spectral resolution enables a scientific program which serves a broad user community and at the same time provides the opportunity for breakthroughs in many areas of astrophysics. The high level specifications of the instrument are derived from a detailed science case based on the capability to obtain, for the first time, milliarcsecond-resolution images of a wide range of targets including: probing the initial conditions for planet formation in the AU-scale environments of young stars; imaging convective cells and other phenomena on the surfaces of stars; mapping the chemical and physical environments of evolved stars, stellar remnants, and stellar winds; and disentangling the central regions of active galactic nuclei and supermassive black holes. VSI will provide these new capabilities using technologies which have been extensively tested in the past and VSI requires little in terms of new infrastructure on the VLTI. At the same time, VSI will be able to make maximum use of new infrastructure as it becomes available; for example, by combining 4, 6 and eventually 8 telescopes, enabling rapid imaging through the measurement of up to 28 visibilities in every wavelength channel within a few minutes. The current studies are focused on a 4-telescope version with an upgrade to a 6-telescope one. The instrument contains its own fringe tracker and tip-tilt control in order to reduce the constraints on the VLTI infrastructure and maximize the scientific return.

Proceedings Article | 28 July 2008 Paper

Paper

Wolf-Rayet stars probed by AMBER/VLTI

Florentin Millour, Olivier Chesneau, Thomas Driebe, Romain Petrov, Daniel Bonneau, Luc Dessart, Karl-Heinz Hofmann, Gerd Weigelt

Proceedings Volume 7013, 70130T (2008) https://doi.org/10.1117/12.788719

KEYWORDS: Stars, Visibility, K band, Interferometry, Spectral resolution, Binary data, Telescopes, Data acquisition, Spectroscopy, Bromine

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Proceedings Article | 28 June 2006 Paper

Paper

VLTI/MIDI observation of the silicate carbon star Hen 38 (IRAS08002-3803): silicate dust reservoir spatially resolved for the first time

Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann, Thomas Preibisch, Dieter Schertl, Gerd Weigelt

Proceedings Volume 6268, 62682V (2006) https://doi.org/10.1117/12.671145

KEYWORDS: Silicates, Stars, Carbon, Visibility, Surface conduction electron emitter displays, Iron, Radiative transfer, Spherical lenses, Lawrencium, Solids

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Proceedings Article | 28 June 2006 Paper

Paper

VLTI-AMBER observations of Eta Carinae with high spatial resolution and spectral resolutions of 1,500 and 10,000

Gerd Weigelt, Romain Petrov, Olivier Chesneau, Kris Davidson, Armando Domiciano de Souza, Thomas Driebe, Renaud Foy, Didier Fraix-Burnet, Ted Gull, John Hillier, Karl-Heinz Hofmann, Stefan Kraus, Fabien Malbet, Alessandro Marconi, Philippe Mathias, Jean-Louis Monin, Florentin Millour, Keiichi Ohnaka, Frederik Rantakyrö, Andrea Richichi, Dieter Schertl, Markus Schöller, Philippe Stee, Leonardo Testi, Markus Wittkowski

Proceedings Volume 6268, 62682S (2006) https://doi.org/10.1117/12.671582

KEYWORDS: Visibility, Bromine, Spectral resolution, K band, Stars, Spatial resolution, Phase measurement, Observatories, Interferometry, Near infrared

Read Abstract +

Proceedings Article | 28 June 2006 Paper

Paper

2006 interferometry imaging beauty contest

Peter Lawson, William Cotton, Christian Hummel, Fabien Baron, John Young, Stefan Kraus, Karl-Heinz Hofmann, Gerd Weigelt, Michael Ireland, John Monnier, Eric Thiébaut, Sridharan Rengaswamy, Olivier Chesneau

Proceedings Volume 6268, 62681U (2006) https://doi.org/10.1117/12.670409

KEYWORDS: Interferometry, Data modeling, Interferometers, Visibility, Image restoration, Image resolution, Reconstruction algorithms, Observatories, Algorithm development, Telescopes

Read Abstract +

Proceedings Article | 28 June 2006 Paper

Paper

Aperture-synthesis imaging with the LBT: reconstruction of diffraction-limited images from LBT LINC-NIRVANA data using the Richardson-Lucy and regularized building block method

Karl-Heinz Hofmann, Thomas Driebe, Mathias Heininger, Dieter Schertl, Gerd Weigelt

Proceedings Volume 6268, 62683H (2006) https://doi.org/10.1117/12.671535

KEYWORDS: Point spread functions, Computer simulations, Image restoration, Stars, Telescopes, Galactic astronomy, Device simulation, Space telescopes, Sensors, Error analysis

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Proceedings Article | 28 June 2006 Paper

Paper

Aperture synthesis image reconstruction study for the mid-infrared VLTI imager MATISSE

Karl-Heinz Hofmann, Stefan Kraus, Bruno Lopez, Gerd Weigelt, Sebastian Wolf

Proceedings Volume 6268, 62683I (2006) https://doi.org/10.1117/12.671678

KEYWORDS: Visibility, Astatine, Image restoration, Mid-IR, Synthetic apertures, Image quality, Telescopes, Interferometry, Imaging systems, Image resolution

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Proceedings Article | 28 June 2006 Paper

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

Read Abstract +

Proceedings Article | 27 June 2006 Paper

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

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Paper

High-resolution near-infrared speckle interferometry and radiative transfer modeling of the OH/IR star OH 104.9+2.4

Dominik Riechers, Yuri Balega, Thomas Driebe, Karl-Heinz Hofmann, Alexander Men'shchikov, Dieter Schertl, Gerd Weigelt

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551413

KEYWORDS: Visibility, Surface conduction electron emitter displays, Stars, Cadmium sulfide, Radiative transfer, Silicates, Data modeling, Speckle interferometry, K band, Scattering

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Proceedings Article | 20 October 2004 Paper

Paper

Recombining light of the VLTI at 10 microns by densifying the images

Michel Dugue, Bruno Lopez, Frank Przygodda, Uwe Graser, Philippe Gitton, Sebastian Wolf, Philippe Mathias, Pierre Antonelli, J. C. Augereau, Nicole Berruyer, Yves Bresson, Olivier Chesneau, Anne Dutrey, Sebastien Flament, Annelie Glazenborg-Kluttig, Andreas Glindemann, Thomas Henning, Karl-Heinz Hofmann, Stephane Lagarde, Yves Hugues, Christoph Leinert, Klaus Meisenheimer, Jean-Luc Menut, Ralf-Rainer Rohloff, Alain Roussel, Eric Thiebaut, Gerd Weigelt

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551543

KEYWORDS: Telescopes, Synthetic apertures, Mid-IR, Interferometry, Astatine, Segmented mirrors, Observatories, Optical instrument design, Stars, Mirrors

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Paper

APreS-MIDI, APerture Synthesis in the MID-infrared with the VLTI

Bruno Lopez, Frank Przygodda, Sebastian Wolf, Michel Dugue, Uwe Graser, Philippe Gitton, Philippe Mathias, Pierre Antonelli, J. C. Augereau, Nicole Berruyer, Yves Bresson, Olivier Chesneau, Anne Dutrey, Sebastien Flament, Annelie Glazenborg, Andreas Glindemann, Thomas Henning, Karl-Heinz Hofmann, Yves Hugues, Stephane Lagarde, Christoph Leinert, Klaus Meisenheimer, Jean-Luc Menut, Ralf-Rainer Rohloff, Alain Roussel, Eric Thiebaut, Gerd Weigelt

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551419

KEYWORDS: Mid-IR, Stars, Telescopes, Visibility, Synthetic apertures, Interferometry, Interferometers, Astatine, Galactic astronomy, Space telescopes

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Paper

The fringe and flexure tracking detector of the LBT LINC-NIRVANA beam-combiner instrument

Udo Beckmann, Jan Behrend, Hermann Bohnhardt, Claus Connot, Thomas Driebe, Matthias Heininger, Thomas Herbst, Karl-Heinz Hofmann, Edmund Nussbaum, Dieter Schertl, Walter Solscheid, Christian Straubmeier, Gerd Weigelt

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551195

KEYWORDS: Sensors, Electronics, Signal processing, Clocks, Stars, Atmospheric optics, Signal detection, Video, Image processing, Analog electronics

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Paper

Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared

Henry Woodruff, Maren Eberhardt, Thomas Driebe, Karl-Heinz Hofmann, Keiichi Ohnaka, Andrea Richichi, Dieter Schertl, Markus Schoeller, Michael Scholz, Gerd Weigelt, Markus Wittkowski, Peter Wood

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551245

KEYWORDS: Visibility, Stars, Calibration, Interferometry, Atmospheric modeling, K band, Data modeling, Spatial frequencies, Surface conduction electron emitter displays, Speckle

Read Abstract +

Proceedings Article | 21 February 2003 Paper

Paper

JHK-band spectro-interferometry of T Cep with the IOTA interferometer

Gerd Weigelt, Udo Beckmann, Jean-Philippe Berger, Thomas Bloecker, Michael Brewer, Karl-Heinz Hofmann, Marc Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John Monnier, Keiichi Ohnaka, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Michael Scholz, Wesley Traub, Boris Yudin

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458659

KEYWORDS: Visibility, K band, Stars, Interferometers, Radium, Linear filtering, Astronomy, Prisms, Temperature metrology, Spatial frequencies

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Proceedings Article | 21 February 2003 Paper

Paper

Near-infrared IOTA interferometry of the symbiotic star CH Cyg

Karl-Heinz Hofmann, Udo Beckmann, Jean-Philippe Berger, Thomas Bloecker, Michael Brewer, Marc Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John Monnier, Keiichi Ohnaka, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Michael Scholz, Wesley Traub, Gerd Weigelt, Boris Yudin

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458904

KEYWORDS: Visibility, Stars, K band, Interferometry, Electromagnetic coupling, Linear filtering, Astronomy, Interferometers, Radium, Physics

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Proceedings Article | 21 February 2003 Paper

Paper

System analysis of the AMBER instrument on VLTI

Fabien Malbet, Romain Petrov, Isabelle Tallon-Bosc, Karl-Heinz Hofmann, Denis Mourard, Thierry Forveille, Frederic Cassaing, Francois Reynaud, Michel Tallon, Pierre Mege, Karine Rousselet-Perraut

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458832

KEYWORDS: Calibration, Signal to noise ratio, Interferometry, Atmospheric optics, K band, Spectral resolution, Wavefronts, Refraction, Modulation, Optical fibers

Read Abstract +

Proceedings Article | 21 February 2003 Paper

Paper

Bispectrum speckle interferometry and future long-baseline interferometry of the carbon star IRC+ 10216

Thomas Bloecker, Yuri Balega, Karl-Heinz Hofmann, Alexander Men'shchikov, Gerd Weigelt, Jan-Martin Winters

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458916

KEYWORDS: Stars, Speckle, K band, Interferometry, Carbon, Telescopes, Radiative transfer, Image resolution, Speckle interferometry, Modeling

Read Abstract +

Proceedings Article | 21 February 2003 Paper

Paper

IOTA observation of the circumstellar envelope of R CrB

Keiichi Ohnaka, Udo Beckmann, Jean-Philippe Berger, Michael Brewer, Karl-Heinz Hofmann, Marc Lacasse, Victor Malanushenko, Rafael Millan-Gabet, John Monnier, Ettore Pedretti, Dieter Schertl, F. Peter Schloerb, Victor Shenavrin, Wesley Traub, Gerd Weigelt, Boris Yudin

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458931

KEYWORDS: Visibility, Stars, K band, Interferometry, Surface conduction electron emitter displays, Clouds, Infrared telescopes, Astronomy, Infrared radiation, Optical telescopes

Read Abstract +

Proceedings Article | 21 February 2003 Paper

Paper

Bispectrum speckle interferometry and future long-baseline interferometry of the young bipolar outflow source S140 IRS1

Thomas Preibisch, Yuri Balega, Dieter Schertl, Karl-Heinz Hofmann, Gerd Weigelt

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458897

KEYWORDS: Infrared imaging, Speckle, Polarization, Interferometry, Speckle interferometry, Image resolution, K band, Stars, Infrared radiation, Telescopes

Read Abstract +

Proceedings Article | 21 February 2003 Paper

Paper

Interferometric studies of nearby galactic centers

Markus Wittkowski, Wolfgang Duschl, Karl-Heinz Hofmann, Alexander Men'shchikov, Gerd Weigelt

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.457964

KEYWORDS: Interferometry, Visibility, Interferometers, K band, Spatial resolution, Clouds, Telescopes, Stars, Radio optics, Diffraction

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Proceedings Article | 21 February 2003 Paper

Paper

New beam-combination techniques at IOTA

Wesley Traub, Angela Ahearn, Nathaniel Carleton, Jean-Philippe Berger, Michael Brewer, Karl-Heinz Hofmann, Pierre Kern, Marc Lacasse, Fabien Malbet, Rafael Millan-Gabet, John Monnier, Keiichi Ohnaka, Ettore Pedretti, Sam Ragland, F. Peter Schloerb, Kamal Souccar, Gerd Weigelt

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459718

KEYWORDS: Telescopes, Stars, Sensors, Interferometers, Integrated optics, Mirrors, Charge-coupled devices, Visibility, Computing systems, Control systems

Read Abstract +

SPIE Journal Paper | 1 May 2001

Computer simulations of interferometric imaging with the Very Large Telescope Interferometer and its Astronomical Multibeam Recombiner instrument

Frank Przygodda, Thomas Bloecker, Karl-Heinz Hofmann, Gerd Weigelt

OE, Vol. 40, Issue 05, (May 2001) https://doi.org/10.1117/12.10.1117/1.1361106

KEYWORDS: Visibility, Computer simulations, Stars, Interferometry, Telescopes, Error analysis, Device simulation, Sensors, Interferometers, Astronomy

Proceedings Article | 5 July 2000 Paper

Paper

Observations of MIRA stars with the IOTA/FLUOR interferometer and comparison with MIRA star models

Karl-Heinz Hofmann, Udo Beckmann, Thomas Bloecker, Vincent Coude du Foresto, Marc Lacasse, Rafael Millan-Gabet, Sebastien Morel, B. Pras, Cyril Ruilier, Dieter Schertl, Michael Scholz, Victor Shenavrin, Wesley Traub, Gerd Weigelt, Markus Wittkowski, Boris Yudin

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390270

KEYWORDS: Stars, K band, Visibility, Temperature metrology, Interferometers, Spatial frequencies, Fiber optics, Atmospheric optics, Astronomy, Interferometry

Read Abstract +

Proceedings Article | 5 July 2000 Paper

Paper

AMBER: the near-infrared focal instrument for the Very Large Telescope Interferometer

Romain Petrov, Fabien Malbet, Andrea Richichi, Karl-Heinz Hofmann, Denis Mourard, Karim Agabi, Pierre Antonelli, Eric Aristidi, Carlo Baffa, Udo Beckmann, Philippe Berio, Yves Bresson, Frederic Cassaing, Alain Chelli, Albrecht Dreiss, Michel Dugue, Gilles Duvert, Thierry Forveille, E. Fossat, Sandro Gennari, M. Geng, Andre Glentzlin, Daniel Kamm, Stephane Lagarde, Etienne LeCoarer, Danielle LeContel, John Michel LeContel, Franco Lisi, Bruno Lopez, Gilbert Mars, Gregoire Martinot-Lagarde, Djamel Mekarnia, Jean-Louis Monin, David Mouillet, Christian Perrier-Bellet, Pascal Puget, Yves Rabbia, Sylvestre Rebattu, Francois Reynaud, Sylvie Robbe-Dubois, Karine Perraut-Rousselet, Michel Sacchettini, Markus Schoeller, Isabelle Tallon-Bosc, Gerd Weigelt

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390256

KEYWORDS: Telescopes, Visibility, Interferometry, Spectrographs, Adaptive optics, Sensors, Stars, Spatial filters, Interferometers, Optical fibers

Read Abstract +

Proceedings Article | 5 July 2000 Paper

Paper

GI2T/REGAIN spectro-interferometry with a new infrared beam combiner

Gerd Weigelt, Denis Mourard, Lyu Abe, Udo Beckmann, Olivier Chesneau, C. Hillemanns, Karl-Heinz Hofmann, Sam Ragland, Dieter Schertl, Michael Scholz, Philippe Stee, Nathalie Thureau, Farrokh Vakili

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390261

KEYWORDS: Stars, Calcium, Visibility, K band, Infrared radiation, Interferometers, Temperature metrology, Digital signal processing, Carbon monoxide, Signal processing

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Proceedings Article | 5 July 2000 Paper

Paper

AMBER data structure, processing, and calibration

David Mouillet, Gilles Duvert, Thierry Forveille, Karl-Heinz Hofmann, Fabien Malbet, Michel Sacchettini, Dieter Schertl

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390217

KEYWORDS: Calibration, Sensors, Interferometry, Visibility, Spatial filters, Astronomy, Telescopes, Spectral resolution, Data acquisition, Data processing

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Proceedings Article | 5 July 2000 Paper

Paper

AMBER data simulator

Gilles Duvert, David Mouillet, Fabien Malbet, Philippe Berio, Thierry Forveille, Eric Aristidi, Karl-Heinz Hofmann, Pierre Mege

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390211

KEYWORDS: Adaptive optics, Device simulation, Telescopes, Optical simulations, Spectral resolution, Infrared cameras, Stars, Cameras, Fourier transforms, Astronomy

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Proceedings Article | 5 July 2000 Paper

Paper

Computer simulations of interferometric imaging with the VLT Interferometer and the AMBER instrument

Thomas Bloecker, Karl-Heinz Hofmann, Frank Przygodda, Gerd Weigelt

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390205

KEYWORDS: Visibility, Interferometry, Computer simulations, Stars, Interferometers, Radiative transfer, Sensors, Atmospheric propagation, Device simulation, Telescopes

Read Abstract +

Proceedings Article | 24 July 1998 Paper

Paper

PRIMA: study for a dual-beam instrument for the VLT Interferometer

Andreas Quirrenbach, Vincent Coude du Foresto, Gerard Daigne, Karl-Heinz Hofmann, Reiner Hofmann, Mario Lattanzi, R. Osterbart, Rudolf le Poole, Didier Queloz, Farrokh Vakili

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317149

KEYWORDS: Stars, Interferometers, Sensors, Telescopes, Interferometry, Metrology, Multiplexing, Velocity measurements, Motion measurement, Astatine

Read Abstract +

Proceedings Article | 26 July 1993 Paper

Paper

Iterative image reconstruction from the bispectrum of astronomical speckle interferograms

K.-H. Hofmann

Proceedings Volume 1983, 198328 (1993) https://doi.org/10.1117/12.2308499

Read Abstract +

Proceedings Article | 1 November 1990 Paper

Paper

Image reconstruction from the bispectrum using an iterative algorithm and applications of the method to astronomical objects

Karl-Heinz Hofmann, Gerd Weigelt

Proceedings Volume 1351, (1990) https://doi.org/10.1117/12.23661

KEYWORDS: Image restoration, Reconstruction algorithms, Astronomy, Speckle, Telescopes, Photography, Point spread functions, Stars, Earth's atmosphere, Interferometry

Read Abstract +

Proceedings Article | 1 July 1990 Paper

Paper

Image reconstruction from the bispectrum using an iterative algorithm and applications of the method to astronomical objects

Karl-Heinz Hofmann, Gerd Weigelt

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.34797

Read Abstract +

Proceedings Article | 1 July 1990 Paper

Paper

Photon-counting speckle masking: the photon-counting hole in the triple correlation

Karl-Heinz Hofmann

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.34804

Read Abstract +

Proceedings Article | 1 July 1990 Paper

Paper

Photon-counting speckle masting

Karl-Heinz Hofmann, W. Mauder, Gerd Weigelt

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.34796

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Showing 5 of 63 publications

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