Dr. Ralf Siebenmorgen Profile

Dr. Ralf Siebenmorgen

Scientist at European Southern Observatory

SPIE Involvement:

Author

Publications (41)

Proceedings Article | 30 August 2022 Presentation + Paper

Lessons learned from the NEAR experiment and prospects for the upcoming mid-IR HCI instruments

Prashant Pathak, Markus Kasper, Olivier Absil, Gilles Orban de Xivry, Ulli Käufl, Gerd Jakob, Ralf Siebenmorgen, Serban Leveratto, Eric Pantin

Proceedings Volume 12185, 121851T (2022) https://doi.org/10.1117/12.2630040

KEYWORDS: Human-computer interaction, Mid-IR, Coronagraphy, Point spread functions, Planets, Exoplanets, Image processing, Sensors, Adaptive optics, Digital filtering

Read Abstract +

Proceedings Article | 29 August 2022 Poster + Paper

Employing ELT software technologies for the upgrade of the FORS instrument at ESO VLT

R. Cirami, V. Baldini, G. Calderone, I. Coretti, P. Di Marcantonio, A. Sulich, H. M. J. Boffin, D. Del Valle, F. Derie, A. Manescau, R. Siebenmorgen

Proceedings Volume 12189, 1218929 (2022) https://doi.org/10.1117/12.2629808

KEYWORDS: Control systems, Standards development, Software development, Electronics, Spectroscopes, Telescopes, Observatories

Read Abstract +

Proceedings Article | 29 August 2022 Presentation + Paper

Status update on the development of METIS, the mid-infrared ELT imager and spectrograph

Bernhard Brandl, Felix Bettonvil, Roy van Boekel, Adrian Glauser, Sascha Quanz, Olivier Absil, Markus Feldt, Paulo J. Garcia, Alistair Glasse, Manuel Guedel, Lucas Labadie, Michael Meyer, Eric Pantin, Shiang-Yu Wang, Hans van Winckel, Tibor Agócs, António Amorim, Thomas Bertram, Leonard Burtscher, Christian Delacroix, Werner Laun, Dirk Lesman, Gert Raskin, Chad Salo, Silvia Scheithauer, Remko Stuik, Stephen Todd, Christoph Haupt, Ralf Siebenmorgen

Proceedings Volume 12184, 1218421 (2022) https://doi.org/10.1117/12.2628331

KEYWORDS: Imaging systems, Coronagraphy, Adaptive optics, Imaging spectroscopy, Stars, Spectrographs, Sensors, Telescopes, Mirrors, Calibration

Read Abstract +

Proceedings Article | 28 December 2020 Paper

Towards a physical understanding of the thermal background in large ground-based telescopes

Leonard Burtscher, Ioannis Politopoulos, Sergio Fernández-Acosta, Tibor Agocs, Mario van den Ancker, Roy van Boekel, Bernhard Brandl, Hans-Ulrich Käufl, Eric Pantin, Alex Pietrow, Ralf Siebenmorgen, Remko Stuik, Konrad Tristram, Willem-Jan de Wit

Proceedings Volume 11447, 114477L (2020) https://doi.org/10.1117/12.2576271

KEYWORDS: Mid-IR, Telescopes, Spectrographs, Ray tracing, Imaging systems, Exoplanets, Cryogenics, Cameras

Read Abstract +

Proceedings Article | 18 December 2020 Presentation + Paper

A status report on the instruments for ESO’s Extremely Large Telescope

Suzanne Ramsay, Paola Amico, Naidu Bezawada, Fabio Biancat Marchet, Patrick Caillier, Michele Cirasuolo, Ralf Conzelmann, Reinhold Dorn, Sebastian Egner, Christoph Frank, Elizabeth George, Frederic Gonte, Juan Carlos González Herrera, Peter Hammersley, Christoph Haupt, Derek Ives, Gerd Jakob, Florian Kerber, Bertrand Koehler, Sylvain Oberti, Christian Schmid, Johannes Schimpelsberger, Ulf Seemann, Ralf Siebenmorgen, Roberto Tamai, Joël Vernet

Proceedings Volume 11447, 114471U (2020) https://doi.org/10.1117/12.2562555

KEYWORDS: Large telescopes, Spectrographs, Adaptive optics, Imaging systems, Cameras, Mid-IR, Tomography, Astronomical imaging

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

FORS-Up: Making the most versatile instrument in Paranal ready for 15 more years of operations

H. M. Boffin, F. Dérie, A. Manescau, R. Siebenmorgen, V. Baldini, G. Calderone, R. Cirami, I. Coretti, P. Di Marcantonio, J. Kosmalski, P. Lilley, S. Moehler, M. Nonino, G. Rupprecht, A. Silber

Proceedings Volume 11447, 114477A (2020) https://doi.org/10.1117/12.2562244

KEYWORDS: Astronomical imaging, Spectroscopes, Standards development, Observatories, Large telescopes, Spectrographs, Polarimetry, Imaging spectroscopy, Optical spectroscopy imaging, Optical spectroscopy

Read Abstract +

SPIE Journal Paper | 16 September 2020 Open Access

Design, pointing control, and on-sky performance of the mid-infrared vortex coronagraph for the VLT/NEAR experiment

Anne-Lise Maire, Elsa Huby, Olivier Absil, Gérard Zins, Markus Kasper, Christian Delacroix, Serban Leveratto, Mikael Karlsson, Garreth Ruane, Hans-Ulrich Käufl, Gilles Orban de Xivry, Prashant Pathak, Lorenzo Pettazzi, Philippe Duhoux, Johann Kolb, Éric Pantin, A. J. Eldorado Riggs, Ralf Siebenmorgen, Dimitri Mawet

JATIS, Vol. 6, Issue 03, 035003, (September 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.3.035003

KEYWORDS: Coronagraphy, Mid-IR, Stars, Adaptive optics, Telescopes, Point spread functions, Error analysis, Device simulation, Image analysis, Sensors

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 3 January 2020 Paper

The ESO Extremely Large Telescope instrumentation programme

Suzanne Ramsay, Paola Amico, Naidu Bezawada, Michele Cirasuolo, Frédéric Derie, Sebastian Egner, Elizabeth George, Frédéric Gonté, Juan Carlos González Herrera, Peter Hammersley, Christoph Haupt, Jeroen Heijmans, Derek Ives, Gerd Jakob, Florian Kerber, Bertrand Koehler, Vincenzo Mainieri, Antonio Manescau, Sylvain Oberti, Paolo Padovani, Celine Peroux, Ralf Siebenmorgen, Roberto Tamai, Joël Vernet

Proceedings Volume 11203, 1120303 (2020) https://doi.org/10.1117/12.2541400

KEYWORDS: Adaptive optics, Spectrographs, Telescopes, Large telescopes, Cameras, Spectroscopy, Exoplanets, Stars, Spectral resolution, Laser guide stars

Read Abstract +

Proceedings Article | 12 July 2018 Presentation + Paper

Status of the mid-IR ELT imager and spectrograph (METIS)

Bernhard Brandl, Olivier Absil, Tibor Agócs, Nicola Baccichet, Thomas Bertram, Felix Bettonvil, Roy van Boekel, Leonard Burtscher, Ewine van Dishoeck, Markus Feldt, Paulo J. Garcia, Alistair Glasse, Adrian Glauser, Manuel Güdel, Christoph Haupt, Matthew Kenworthy, Lucas Labadie, Werner Laun, Dirk Lesman, Eric Pantin, Sascha Quanz, Ignas Snellen, Ralf Siebenmorgen, Hans van Winckel

Proceedings Volume 10702, 107021U (2018) https://doi.org/10.1117/12.2311492

KEYWORDS: Imaging systems, Calibration, Imaging spectroscopy, Planets, Adaptive optics, Coronagraphy, Mirrors, Spectrographs, Spectroscopy, Telescopes

Read Abstract +

Proceedings Article | 6 July 2018 Presentation + Paper

Instrumentation for ESO's Extremely Large Telescope

Suzanne Ramsay, Mark Casali, Paola Amico, Naidu Bezawada, Michele Cirasuolo, Ralf Conzelmann, Sebastian Egner, Christoph Frank, Elizabeth George, Juan Carlos González Herrera, Peter Hammersley, Christoph Haupt, Jeroen Heijmans, Derek Ives, Gerd Jakob, Florian Kerber, Betrand Koehler, Vincenzo Mainieri, Antonio Manescau, Enrico Marchetti, Sylvain Oberti, Paolo Padovani, Christian Schmid, Johannes Schimpelsberger, Ralf Siebenmorgen, Roberto Tamai, Joël Vernet

Proceedings Volume 10702, 107021P (2018) https://doi.org/10.1117/12.2313540

KEYWORDS: Sensors, Adaptive optics, Telescopes, Cameras, Spectrographs, Imaging spectroscopy, Wavefront sensors, Cryogenics, Large telescopes, Spectroscopes

Read Abstract +

Proceedings Article | 6 July 2018 Presentation + Paper

NEAR: new earths in the Alpha Cen Region (bringing VISIR as a "visiting instrument" to ESO-VLT-UT4)

Hans-Ulrich Käufl, Markus Kasper, Robin Arsenault, Gerd Jakob, Serban Leveratto, Gerard Zins, Eloy Fuenteseca, Miguel Riquelme, Ralf Siebenmorgen, Michael Sterzik, Nancy Ageorges, Sven Gutruf, Dirk Kampf, Arnd Reutlinger, Olivier Absil, Brunella Carlomagno, Olivier Guyon, Pete Klupar, Dimitri Mawet, Garreth Ruane, Mikael Karlsson, Eric Pantin, Kjetil Dohlen

Proceedings Volume 10702, 107020D (2018) https://doi.org/10.1117/12.2313395

KEYWORDS: Coronagraphy, Telescopes, Stars, Adaptive optics, Sensors, Mirrors, Planets, Optical filters

Read Abstract +

Proceedings Article | 9 August 2016 Paper

Progress along the E-ELT instrumentation roadmap

Suzanne Ramsay, Mark Casali, Michele Cirasuolo, Sebastian Egner, Peter Gray, Juan Carlos Gonzáles Herrera, Peter Hammersley, Christoph Haupt, Derek Ives, Lieselotte Jochum, Markus Kasper, Florian Kerber, Steffan Lewis, Vincenzo Mainieri, Antonio Manescau, Enrico Marchetti, Sylvain Oberti, Paolo Padovani, Christian Schmid, Johannes Schimpelsberger, Ralf Siebenmorgen, Orsolya Szecsenyi, Roberto Tamai, Joël Vernet

Proceedings Volume 9908, 99081T (2016) https://doi.org/10.1117/12.2232407

KEYWORDS: Spectrographs, Adaptive optics, Cameras, Telescopes, Spectral resolution, Interfaces, Space telescopes, Laser guide stars, Mirrors, Sensors

Read Abstract +

Proceedings Article | 3 August 2016 Paper

Performance updates of HAWK-I and preparation for the commissioning of the system GRAAL+HAWK-I

Pascale Hibon, Jerome Paufique, Harald Kuntschner, Danuta Dobrzycka, Miska Le Louarn, Elena Valenti, Mark Neeser, Emanuela Pompei, Robin Arsenault, Ralf Siebenmorgen, Pierre-Yves Madec, Monika Petr-Gotzens, Carlos La Fuente, Josefina Urrutia, Javier Valenzuela, Roberto Castillo, Pedro Baksai, Cesar Enrique Garcia Dabo, Andreas Jost, Javier Argomedo, Johann Kolb, Mario Kiekebusch, Norbert Hubin, Philippe Duhoux, Ralf Dieter Conzelmann, Robert Donaldson, Sebastien Tordo, Stefan Huber

Proceedings Volume 9908, 99080F (2016) https://doi.org/10.1117/12.2231305

KEYWORDS: Adaptive optics, Imaging systems, K band, Adaptive optics, Stars, Sensors, Galactic astronomy, Point spread functions, Telescopes, Calibration, Spatial resolution

Read Abstract +

Proceedings Article | 3 August 2016 Paper

VISIR upgrade overview: all's well that ends well

Florian Kerber, Hans Ulrich Käufl, Konrad Tristram, Daniel Asmus, Pedro Baksai, Nicola Di Lieto, Danuta Dobrzycka, Philippe Duhoux, Gert Finger, Christian Hummel, Derek Ives, Gerd Jakob, Lars Lundin, Dimitri Mawet, Leander Mehrgan, Eric Pantin, Miguel Riquelme, Joel Sanchez, Stefan Sandrock, Ralf Siebenmorgen, Jörg Stegmeier, Alain Smette, Julian Taylor, Mario van den Ancker, Guillermo Valdes, Lars Venema

Proceedings Volume 9908, 99080D (2016) https://doi.org/10.1117/12.2232441

KEYWORDS: Sensors, Mid-IR, Imaging spectroscopy, Detector arrays, Imaging systems, Image quality, Telescopes, Coronagraphy, Stars, Spectroscopy

Read Abstract +

We present an overview of the VISIR instrument after its upgrade and return to science operations. VISIR is the midinfrared imager and spectrograph at ESO’s VLT. The project team is comprised of ESO staff and members of the original VISIR consortium: CEA Saclay and ASTRON. The project plan was based on input from the ESO user community with the goal of enhancing the scientific performance and efficiency of VISIR by a combination of measures: installation of improved hardware, optimization of instrument operations and software support. The cornerstone of the upgrade is the 1k by 1k Si:As AQUARIUS detector array manufactured by Raytheon. In addition, a new prism spectroscopic mode covers the whole N-band in a single observation. Finally, new scientific capabilities for high resolution and high-contrast imaging are offered by sub-aperture mask and coronagraphic modes. In order to make optimal use of favourable atmospheric conditions, a water vapour monitor has been deployed on Paranal, allowing for real-time decisions and the introduction of a user-defined constraint on water vapour. During the commissioning in 2012, it was found that the on-sky sensitivity of the AQUARIUS detector was significantly below expectations. Extensive testing of the detector arrays in the laboratory and on-sky enabled us to diagnose the cause for the shortcoming of the detector as excess low frequency noise. It is inherent to the design chosen for this detector and cannot be remedied by changing the detector set-up. Since this is a form of correlated noise, its impact can be limited by modulating the scene recorded by the detector. After careful analysis, we have implemented fast (up to 4 Hz) chopping with field stabilization using the secondary mirror of the VLT. During commissioning, the upgraded VISIR has been confirmed to be more sensitive than the old instrument, and in particular for low-resolution spectroscopy in the N-band, a gain of a factor 6 is realized in observing efficiency. After overcoming several additional technical problems, VISIR is back in Science Operations since April 2015. In addition an upgrade of the IT infrastructure related to VISIR has been conducted in order to support burst-mode operations. Science Verification of the new modes was performed in Feb 2016. The upgraded VISIR is a powerful instrument providing close to background limited performance for diffraction-limited observations at an 8-m telescope. It offers synergies with facilities such as ALMA, JWST, VLTI and SOFIA, while a wealth of targets is available from survey works like WISE. In addition, it will bring confirmation of the technical readiness and scientific value of several aspects for future mid-IR instrumentation at Extremely Large Telescopes. We also present several lessons learned during the project.

Proceedings Article | 27 July 2016 Paper

GRAAL on the mountaintop

Jérôme Paufique, Pierre-Yves Madec, Johann Kolb, Harald Kuntschner, Javier Argomedo, Mario Kiekebusch, Robert Donaldson, Robin Arsenault, Ralf Siebenmorgen, Christian Soenke, Sebastien Tordo, Ralf Conzelmann, Andreas Jost, Javier Reyes-Moreno, Mark Downing, Pascale Hibon, Jose Javier Valenzuela, Pierre Haguenauer

Proceedings Volume 9909, 99092H (2016) https://doi.org/10.1117/12.2232826

KEYWORDS: Adaptive optics, Imaging systems, Observatories, Stars, Sensors, Telescopes, Mirrors, Cameras, Real-time computing, Relays

Read Abstract +

Proceedings Article | 31 July 2014 Paper

VISIR upgrade overview and status

Florian Kerber, Hans-Ulrich Käufl, Pedro Baksai, Nicola Di Lieto, Danuta Dobrzycka, Philippe Duhoux, Gert Finger, Stephanie Heikamp, Derek Ives, Gerd Jakob, Lars Lundin, Dimitri Mawet, Leander Mehrgan, Yazan Momany, Vincent Moreau, Eric Pantin, Miguel Riquelme, Stefan Sandrock, Ralf Siebenmorgen, Alain Smette, Julian Taylor, Mario van den Ancker, Guillermo Valdes, Lars Venema, Ueli Weilenmann

Proceedings Volume 9147, 91470C (2014) https://doi.org/10.1117/12.2055172

KEYWORDS: Sensors, Spectroscopy, Mid-IR, Imaging systems, Imaging spectroscopy, Prisms, Coronagraphy, Quantum efficiency, Detector arrays, Stars

Read Abstract +

We present an overview of the VISIR upgrade project. VISIR is the mid-infrared imager and spectrograph at ESO’s VLT. The project team is comprised of ESO staff and members of the original VISIR consortium: CEA Saclay and ASTRON. The project plan is based on input from the ESO user community with the goal of enhancing the scientific performance and efficiency of VISIR by a combination of measures: installation of improved hardware, optimization of instrument operations and software support. The cornerstone of the upgrade is the 1k by 1k Si:As AQUARIUS detector array (Raytheon) which has been carefully characterized in ESO’s IR detector test facility (modified TIMMI 2 instrument). A prism spectroscopic mode will cover the N-band in a single observation. New scientific capabilities for high resolution and high-contrast imaging will be offered by sub-aperture mask (SAM) and phase-mask coronagraphic (4QPM/AGPM) modes. In order to make optimal use of favourable atmospheric conditions a water vapour monitor has been deployed on Paranal, allowing for real-time decisions and the introduction of a user-defined constraint on water vapour. During the commissioning in 2012 it was found that the on-sky sensitivity of the AQUARIUS detector was significantly below expectations and that VISIR was not ready to go back to science operations. Extensive testing of the detector arrays in the laboratory and on-sky enabled us to diagnose the cause for the shortcoming of the detector as excess low frequency noise (ELFN). It is inherent to the design chosen for this detector and can’t be remedied by changing the detector set-up. Since this is a form of correlated noise its impact can be limited by modulating the scene recorded by the detector. We have studied several mitigation options and found that faster chopping using the secondary mirror (M2) of the VLT offers the most promising way forward. Faster M2 chopping has been tested and is scheduled for implementation before the end of 2014 after which we plan to re-commission VISIR. In addition an upgrade of the IT infrastructure related to VISIR is planned in order to support burst-mode operations. The upgraded VISIR will be a powerful instrument providing close to background limited performance for diffraction-limited observations at an 8-m telescope. It will offer synergy with facilities such as ALMA, JWST, VLTI and SOFIA, while a wealth of targets is available from survey work (e.g. VISTA, WISE). In addition it will bring confirmation of the technical readiness and scientific value of several aspects of potential mid-IR instrumentation at Extremely Large Telescopes.

Proceedings Article | 28 July 2014 Paper

Drift scanning technique for mid-infrared background subtraction

Stephanie Heikamp, Bernhard Brandl, Christoph Keller, Lars Venema, Eric Pantin, Ralf Siebenmorgen, Derek Ives, Florian Kerber

Proceedings Volume 9147, 91479T (2014) https://doi.org/10.1117/12.2065675

KEYWORDS: Signal to noise ratio, Sensors, Photons, Mid-IR, Telescopes, Mirrors, Calibration, Thermography, Infrared radiation, Signal detection

Read Abstract +

Proceedings Article | 27 September 2012 Paper

VISIR upgrade overview and status

Florian Kerber, Hans Ulrich Käufl, Pedro Baksai, Danuta Dobrzycka, Gert Finger, Derek Ives, Gerd Jakob, Eric Lagadec, Lars Lundin, Dimitri Mawet, Leander Mehrgan, Margaret Moerchen, Yazan Momany, Vincent Moreau, Eric Pantin, Miguel Riquelme, Ralf Siebenmorgen, Armin Silber, Alain Smette, Julian Taylor, Mario van den Ancker, Lars Venema, Ueli Weilenmann, Irina Yegorova

Proceedings Volume 8446, 84460E (2012) https://doi.org/10.1117/12.924979

KEYWORDS: Spectroscopy, Sensors, Imaging spectroscopy, Mid-IR, Calibration, Prisms, Coronagraphy, Observatories, Imaging systems, Stars

Read Abstract +

Proceedings Article | 13 September 2012 Paper

Long-term performance of the VISIR/VLT instrument before the upgrade

Danuta Dobrzycka, Yazan Momany, Lars Lundin, Ralf Siebenmorgen, Hans Käufl, Alain Smette, Florian Kerber, Mario Van Den Ancker

Proceedings Volume 8448, 84481P (2012) https://doi.org/10.1117/12.925348

KEYWORDS: Stars, Spectroscopy, Sensors, Calibration, Imaging systems, Digital filtering, Mid-IR, Observatories, Data acquisition, Data conversion

Read Abstract +

Proceedings Article | 13 September 2012 Paper

Status of the GRAAL system development: very wide-field correction with 4 laser guide-stars

J. Paufique, J. Argomedo, R. Arsenault, R. Conzelmann, R. Donaldson, N. Hubin, L. Jochum, A. Jost, M. Kiekebusch, J. Kolb, H. Kuntschner, M. Le Louarn, P-Y. Madec, R. Siebenmorgen, S. Tordo

Proceedings Volume 8447, 844738 (2012) https://doi.org/10.1117/12.927265

KEYWORDS: Adaptive optics, Sensors, Telescopes, Cameras, Mirrors, Laser optics, Observatories, Deformable mirrors, Calibration, Optics manufacturing

Read Abstract +

Proceedings Article | 28 July 2010 Paper

GRAAL: a seeing enhancer for the NIR wide-field imager Hawk-I

J. Paufique, A. Bruton, A. Glindemann, A. Jost, J. Kolb, L. Jochum, M. Le Louarn, M. Kiekebusch, N. Hubin, P.-Y. Madec, R. Conzelmann, R. Siebenmorgen, R. Donaldson, R. Arsenault, S. Tordo

Proceedings Volume 7736, 77361P (2010) https://doi.org/10.1117/12.858261

KEYWORDS: Adaptive optics, Telescopes, Cameras, Sensors, K band, Deformable mirrors, Stars, Observatories, Turbulence, Point spread functions

Read Abstract +

Proceedings Article | 21 July 2010 Paper

Upgrade of VISIR the mid-infrared instrument at the VLT

F. Kerber, H. Kaeufl, M. van den Ancker, P. Baksai, D. Dubreuil, G. Durand, D. Dobrzycka, G. Finger, Ch. Hummel, D. Ives, G. Jakob, E. Lagadec, L. Lundin, G. Marconi, M. Moerchen, Y. Momany, D. Nuernberger, E. Pantin, M. Riquelme, R. Siebenmorgen, A. Smette, L. Venema, U. Weilenmann, I. Yegorova

Proceedings Volume 7735, 77357R (2010) https://doi.org/10.1117/12.857368

KEYWORDS: Sensors, Mid-IR, Telescopes, Astronomy, Observatories, Spectrographs, Infrared radiation, Coronagraphy, Spectral resolution, Infrared telescopes

Read Abstract +

The European Southern Observatory (ESO) is preparing to upgrade VISIR, the mid-IR imager and spectrograph at the VLT. The project team is comprised of ESO staff and members of the original consortium that built VISIR: CEA Saclay and ASTRON. The goal is to enhance the scientific performance of VISIR and to facilitate its use by the ESO community. In order to capture the needs of the user community, we collected input from the users by means of a webbased questionnaire. In line with the results of the internal study and the input from the user community, the upgrade plan calls for a combination measures: installation of improved hardware, optimization of instrument operations and software support. The limitations of the current detector (sensitivity, cosmetics, artifacts) have been known for some time and a new 1k x 1k Si:As Aquarius array (Raytheon) will be the cornerstone of the VISIR upgrade project. A modified spectroscopic mode will allow covering the N-band in a single observation. Several new scientific modes (e.g., polarimetry, coronagraphy) will be implemented on a best effort basis. In addition, the VISIR operational scheme will be enhanced to ensure that optimal use of the observing conditions will be made. Specifically, we plan to provide a means to monitor precipitable water vapour (PWV) and enable the user to specify it as a constraint set for service mode observations. In some regions of the mid-IR domain, the amount of PWV has a fundamental effect on the quality of a given night for mid-IR astronomy. The plan also calls for full support by ESO pipelines that will deliver science-ready data products. Hence the resulting files will provide physical units and error information and all instrumental signatures will have been removed. An upgraded VISIR will be a powerful instrument providing diffraction-limited performance at an 8-m telescope. Its improved performance and efficiency as well as new science capabilities will serve the needs of the ESO community but will also offer synergy with various other facilities such as ALMA, JWST, VLTI and SOFIA. A wealth of targets for detailed study will be available from survey work done by VISTA and WISE. Finally, the upgraded VISIR will also serve as a pathfinder for potential mid-IR instrumentation at the European Extremely Large Telescope (E-ELT) in terms of technology as well as operations.

Proceedings Article | 21 July 2010 Paper

mCorrecting METIS spectra for telluric absorption to maximize spectral fidelity

Stefan Uttenthaler, Klaus Pontoppidan, Andreas Seifahrt, Sarah Kendrew, Joris A. D. Blommaert, Eric Pantin, Bernhard Brandl, Frank Molster, Lars Venema, Rainer Lenzen, Philip Parr-Burman, Ralf Siebenmorgen

Proceedings Volume 7735, 77357A (2010) https://doi.org/10.1117/12.856697

KEYWORDS: Absorption, Spectral resolution, Mid-IR, Spectrographs, Iterated function systems, Astronomy, Current controlled current source, Large telescopes, Imaging spectroscopy, Spectroscopes

Read Abstract +

Proceedings Article | 21 July 2010 Paper

Mid-infrared astronomy with the E-ELT: performance of METIS

S. Kendrew, L. Jolissaint, B. Brandl, R. Lenzen, E. Pantin, A. Glasse, J. Blommaert, L. Venema, R. Siebenmorgen, F. Molster

Proceedings Volume 7735, 77355F (2010) https://doi.org/10.1117/12.857043

KEYWORDS: Telescopes, Imaging spectroscopy, Sensors, Mid-IR, Space telescopes, Spectroscopy, Astronomy, Atmospheric modeling, Spectrographs, Spectroscopes

Read Abstract +

Proceedings Article | 21 July 2010 Paper

METIS: system engineering and optical design of the mid-infrared E-ELT instrument

Rainer Lenzen, Bernhard Brandl, Eric Pantin, Alistair Glasse, Joris Blommaert, Lars Venema, Rik ter Horst, Ad Oudenhuysen, Frank Molster, Ralf Siebenmorgen, Hermann Böhnhardt, Ewine van Dishoeck, Paul van der Werf, Wolfgang Brandner, Thomas Henning, Stefan Hippler, Pierre-Olivier Lagage, Toby Moore, Maarten Baes, Christoffel Waelkens, Chris Wright, Hans Ulrich Käufl, Sarah Kendrew, Remko Stuik, Laurent Jolissaint

Proceedings Volume 7735, 77357O (2010) https://doi.org/10.1117/12.856242

KEYWORDS: Mirrors, Spectroscopy, Imaging spectroscopy, Diffraction, Spectral resolution, Imaging systems, Calibration, Spectrographs, Sensors, Optical design

Read Abstract +

Proceedings Article | 15 July 2010 Paper

Instrument concept and science case for the mid-IR E-ELT imager and spectrograph METIS

Bernhard Brandl, Rainer Lenzen, Eric Pantin, Alistair Glasse, Joris Blommaert, Lars Venema, Frank Molster, Ralf Siebenmorgen, Sarah Kendrew, Maarten Baes, Hermann Böhnhardt, Wolfgang Brandner, Ewine van Dishoeck, Thomas Henning, Hans Ullrich Käufl, Pierre-Olivier Lagage, Toby J. Moore, Christoffel Waelkens, Paul van der Werf

Proceedings Volume 7735, 77352G (2010) https://doi.org/10.1117/12.857346

KEYWORDS: Imaging systems, Adaptive optics, Calibration, Telescopes, Sensors, Iterated function systems, Mid-IR, Spectrographs, Spectral resolution, Stars

Read Abstract +

Proceedings Article | 15 July 2010 Paper

An overview of the E-ELT instrumentation programme

S. Ramsay, S. D'Odorico, M. Casali, J. González, N. Hubin, M. Kasper, H. Käufl, M. Kissler-Patig, E. Marchetti, J. Paufique, L. Pasquini, R. Siebenmorgen, A. Richichi, J. Vernet, F. Zerbi

Proceedings Volume 7735, 773524 (2010) https://doi.org/10.1117/12.857037

KEYWORDS: Telescopes, Adaptive optics, Spectroscopy, Spectrographs, Mirrors, Cameras, Sensors, Near infrared, Spectral resolution, Optical instrument design

Read Abstract +

Proceedings Article | 25 July 2008 Paper

CRIRES: commissioning and first science results

Hans Ulrich Käufl, Paola Amico, Pascal Ballester, Eduardo Bendek Selman, Paul Bristow, Mark Casali, Bernard Delabre, Danuta Dobrzycka, Reinhold Dorn, Raul Esteves, Gert Finger, Gordon Gillet, Domingo Gojak, Michael Hilker, Paul Jolley, Yves Jung, Florian Kerber, Barbara Klein, Jean-Louis Lizon, Jerome Paufique, Jean-Francois Pirard, Eszter Pozna, Hugues Sana, Lilian Sanzana, Ricardo Schmutzer, Andreas Seifahrt, Ralf Siebenmorgen, Alain Smette, Jörg Stegmeier, Lowell Tacconi-Garman, Stefan Uttenthaler, Elena Valenti, Ueli Weilenmann, Burkhard Wolff

Proceedings Volume 7014, 70140W (2008) https://doi.org/10.1117/12.787259

KEYWORDS: Calibration, Sensors, Infrared radiation, Spectrographs, Lamps, Telescopes, Observatories, Cryogenics, Adaptive optics, Spectral resolution

Read Abstract +

Proceedings Article | 21 July 2008 Paper

Studies for the first generation of instruments for the European ELT

Sandro D'Odorico, Mark Casali, Juan-Carlos Gonzales, Markus Kasper, Hans Ulrich Käufl, Markus Kissler Patig, Luca Pasquini, Suzanne Ramsay, Ralf Siebenmorgen, Joel Vernet, Filippo Zerbi

Proceedings Volume 7014, 70141E (2008) https://doi.org/10.1117/12.788422

KEYWORDS: Imaging spectroscopy, Adaptive optics, Telescopes, Spectroscopes, Spectrographs, Near infrared spectroscopy, Atmospheric corrections, Near infrared, Diffraction, Mirrors

Read Abstract +

Proceedings Article | 12 July 2008 Paper

New measures in controlling quality of VLT VISIR

Danuta Dobrzycka, Leonardo Vanzi, Lars Lundin, Hans Ulrich Kaeufl, Ralf Siebenmorgen

Proceedings Volume 7016, 70161H (2008) https://doi.org/10.1117/12.788831

KEYWORDS: Sensors, Spectroscopy, Calibration, Silicates, Imaging spectroscopy, Mid-IR, Imaging systems, Image sensors, Stars, Image filtering

Read Abstract +

Proceedings Article | 9 July 2008 Paper

Lessons learned from VISIR

E. Pantin, C. Doucet, H. U. Käufl, P. O. Lagage, R. Siebenmorgen, M. Sterzik

Proceedings Volume 7014, 701424 (2008) https://doi.org/10.1117/12.788785

KEYWORDS: Mid-IR, Sensors, Calibration, Stars, Point spread functions, Imaging systems, Spectroscopy, Telescopes, Spectral resolution, Galactic astronomy

Read Abstract +

Proceedings Article | 9 July 2008 Paper

METIS: the mid-infrared E-ELT imager and spectrograph

Bernhard Brandl, Rainer Lenzen, Eric Pantin, Alistair Glasse, Joris Blommaert, Lars Venema, Frank Molster, Ralf Siebenmorgen, Hermann Boehnhardt, Ewine van Dishoeck, Paul van der Werf, Thomas Henning, Wolfgang Brandner, Pierre-Olivier Lagage, Toby Moore, Maarten Baes, Christoffel Waelkens, Chris Wright, Hans Ulrich Käufl, Sarah Kendrew, Remko Stuik, Laurent Jolissaint

Proceedings Volume 7014, 70141N (2008) https://doi.org/10.1117/12.789241

KEYWORDS: Mid-IR, Planets, Stars, Imaging spectroscopy, Comets, Adaptive optics, Spectroscopy, Silicates, Spectrographs, Exoplanets

Read Abstract +

Proceedings Article | 9 July 2008 Paper

A mid-infrared polarization capability for the ELT

Christopher Wright, Ralf Siebenmorgen, Bringfried Stecklum, Michael Sterzik, Hans-Ulrich Käufl

Proceedings Volume 7014, 701429 (2008) https://doi.org/10.1117/12.787899

KEYWORDS: Polarization, Mid-IR, Magnetism, Stars, Silicates, Polarimetry, Absorption, Crystals, Spectroscopy, Astronomy

Read Abstract +

Imaging- and spectropolarimetry in the thermal infrared (~ 5-30 μm) can inform us about two important open questions in modern astrophysics - namely the role of magnetism in the formation of stars, and the life-cycle of cosmic dust. These are key questions outlined in the document "A Science Vision for European Astronomy" by de Zeeuw & Molster (2007). Thermal IR polarimetry is the only technique that can peer into the heart of star forming cores, where an infant star heats its immediate surroundings to temperatures of several hundred Kelvin. The polarization itself is induced by a preferential alignment of the spin axis of cosmic dust grains, a process ultimately controlled by the ambient magnetic field. The spectrum is sensitively dependent on the grain optical properties, structure and shape, thus providing information not otherwise obtainable by conventional spectroscopy. The MIRI instrument on the JWST will not have a polarimetry mode, thus leaving open the possibility of an ELT mid-IR instrument being able to make substantial progress on these fundamental issues. Before describing the advantages of a mid-IR spectropolarimeter on an ELT, we first present some preliminary results from our polarization observations with the TIMMI2 mid-IR instrument between 2004 and 2006. The experience gained with TIMMI2 - in terms of technical issues and observing strategy - will inform the design of any future instrument. Following this we will describe the science that could be done with an ELT instrument, and some of the basic design parameters. For instance, with a resolution of ~ 70 milli-arcseconds (FWHM at 10 μm) it will become possible to resolve the magnetic field configuration in the circumstellar disks and bipolar outflows of young stars at a spatial scale of less than 10 AU in the nearest star formation regions. This will strongly constrain hydromagnetic models - the favoured means of extracting angular momentum and allowing accretion to proceed - for bipolar jets emanating from a range of compact astrophysical objects. Further, with a resolving power of order 200, and sensitivity of 100σ in 1 hour integration on a 0.5 mJy point source, the evolution of cosmic dust - and the governing physical and chemical processes - from its formation in old stellar outflows to its deposition in planet-forming disks, will become amenable to detailed polarization studies.

Proceedings Article | 9 July 2008 Paper

Direct thermal imaging of circumstellar discs and exo-planets

Eric Pantin, Ralf Siebenmorgen, Celine Cavarroc, Michael Sterzik

Proceedings Volume 7014, 70142D (2008) https://doi.org/10.1117/12.788826

KEYWORDS: Stars, Planets, Coronagraphy, Point spread functions, Thermography, Jupiter, Mid-IR, Imaging systems, Planetary systems, Monte Carlo methods

Read Abstract +

Proceedings Article | 30 June 2006 Paper

Model-based wavelength calibration for CRIRES

Paul Bristow, Florian Kerber, Michael Rosa, Jean Francois Pirard, Ralf Siebenmorgen, Hans-Ulrich Käufl

Proceedings Volume 6270, 62701T (2006) https://doi.org/10.1117/12.670785

KEYWORDS: Calibration, Data modeling, Prisms, Sensors, Instrument modeling, Spectrographs, Detector arrays, Mirrors, Infrared spectroscopy, Lamps

Read Abstract +

Proceedings Article | 30 June 2006 Paper

VLT VISIR: controlling data quality and instrument performance

Danuta Dobrzycka, Alain Smette, Michael Sterzik, Lars Lundin, Yves Jung, Ralf Siebenmorgen

Proceedings Volume 6270, 627026 (2006) https://doi.org/10.1117/12.669963

KEYWORDS: Calibration, Sensors, Imaging spectroscopy, Spectroscopy, Stars, Spectroscopes, Data processing, Spectral resolution, Imaging systems, Process control

Read Abstract +

Proceedings Article | 30 September 2004 Paper

CRIRES: a high-resolution infrared spectrograph for ESO's VLT

Hans-Ulrich Kaeufl, Pascal Ballester, Peter Biereichel, Bernard Delabre, Rob Donaldson, Reinhold Dorn, Enrico Fedrigo, Gert Finger, Gerhard Fischer, Francis Franza, Domingo Gojak, Gotthard Huster, Yves Jung, Jean-Louis Lizon, Leander Mehrgan, Manfred Meyer, Alan Moorwood, Jean-Francois Pirard, Jerome Paufique, Eszter Pozna, Ralf Siebenmorgen, Armin Silber, Joerg Stegmeier, Stefan Wegerer

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551480

KEYWORDS: Sensors, Infrared radiation, Spectrographs, Calibration, Adaptive optics, Stars, Infrared spectroscopy, Cryogenics, Prisms, Spectral resolution

Read Abstract +

Proceedings Article | 7 March 2003 Paper

TIMMI2, ESO's Thermal Infrared Multimode Instrument: technical description and some scientific results

Hans-Ulrich Kaufl, Michael Sterzik, Ralf Siebenmorgen, Ueli Weilenmann, Helena Relke, Josef Hron, Martin Sperl

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.460335

KEYWORDS: Sensors, Telescopes, Calibration, Infrared radiation, Electronics, Stars, Thermography, Imaging spectroscopy, Infrared telescopes, Optical filters

Read Abstract +

Proceedings Article | 7 March 2003 Paper

CRIRES: a high-resolution infrared spectrograph for the ESO VLT

Alan Moorwood, Peter Biereichel, Joar Brynnel, Bernard Delabre, Reinhold Dorn, Gert Finger, Francis Franza, Gotthard Huster, Yves Jung, Hans-Ulrich Kaeufl, Franz Koch, Markus Kasper, Raphael Lescouzeres, Jean-Luis Lizon, Hamid Mehrgan, Manfred Meyer, Jean-Francois Pirard, Ralf Siebenmorgen, Barbara Sokar, Joerg Stegmeier, Guenther Wiedemann

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.457987

KEYWORDS: Spectrographs, Sensors, Adaptive optics, Prisms, Infrared radiation, Mirrors, Cryogenics, Telescopes, Calibration, Infrared spectroscopy

Read Abstract +

Proceedings Article | 14 February 2003 Paper

Polarimetric mode of TIMM12: technical characteristics and first results

Hans-Ulrich Kaeufl, Michael Sterzik, Ralf Siebenmorgen, Helena Relke, Bringfried Stecklum

Proceedings Volume 4843, (2003) https://doi.org/10.1117/12.458861

KEYWORDS: Polarimetry, Polarization, Polarizers, Calibration, Mirrors, Telescopes, Infrared radiation, Sensors, Stars, Infrared imaging

Read Abstract +

Proceedings Article | 1 November 2001 Paper

Source detection for the ISOCAM parallel survey

Stephan Ott, Jean-Luc Starck, N. Schartel, Ralf Siebenmorgen, T. Vo, H. Aussel, Etienne Bertin

Proceedings Volume 4477, (2001) https://doi.org/10.1117/12.447186

KEYWORDS: Point spread functions, Signal to noise ratio, Algorithm development, Detection and tracking algorithms, Convolution, Stars, Solids, Astrophysics, Astronomy, Mid-IR

Read Abstract +

Showing 5 of 41 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years