Dr. Elena Valenti Profile

Dr. Elena Valenti

at European Southern Observatory

SPIE Involvement:

Author

Publications (15)

Proceedings Article | 29 August 2022 Presentation

Science results from MUSE-NFM (LTAO)

Elena Valenti

Proceedings Volume 12185, 1218502 (2022) https://doi.org/10.1117/12.2630057

KEYWORDS: Infrared sensors, Spatial resolution, Sensors, Resolution enhancement technologies, Planets, Galactic astronomy, Adaptive optics, Stars, Spectroscopy, Spectrographs

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Proceedings Article | 29 August 2022 Presentation + Paper

CRIRES+ on sky: high spectral resolution at infrared wavelength enabling better science at the ESO VLT

Reinhold Dorn, Paul Bristow, Jonathan Smoker, Florian Rodler, Matteo Accardo, Andrea Baruffolo, Claudio Cumani, Andreas Haimerl, Artie Hatzes, Marcus Haug, Ulrike Heiter, Renate Hinterschuster, Norbert Hubin, Derek Ives, Matias Jones, Yves Jung, Jean-Paul Kirchbauer, Barbara Klein, Jana Köhler, Heidi Korhonen, Alexis Lavail, Thomas Marquart, Christophe Moins, Ignacio Molina-Conde, Ernesto Oliva, Laurent Pallanca, Luca Pasquini, Jerome Paufique, Nikolai Piskunov, Ansgar Reiners, Dominik Schneller, Ricardo Schmutzer, Ulf Seemann, Ditte Slumstrup, Alain Smette, Jörg Stegmeier, Eric Stempels, Sebastien Tordo, Elena Valenti, Jose Javier Valenzuela, Joel Vernet

Proceedings Volume 12184, 121841F (2022) https://doi.org/10.1117/12.2629969

KEYWORDS: Sensors, Calibration, Adaptive optics, Stars, Spectral resolution, Spectrographs, Mirrors, K band, Infrared radiation, Polarization

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Proceedings Article | 25 August 2022 Presentation + Paper

Performance characterization and near-real-time monitoring of MUSE adaptive optics modes at Paranal

T. Wevers, F. Selman, A. Reyes, M. Vega, J. Hartke, F. Bian, O. Beltramo-Martin, R. J. L. Fétick, S. Kamann, J. Kolb, T. Kravtsov, C. Moya, B. Neichel, S. Oberti, C. Reyes, E. Valenti

Proceedings Volume 12186, 121860T (2022) https://doi.org/10.1117/12.2630835

KEYWORDS: Point spread functions, Adaptive optics, Stars, Turbulence, Data modeling, Telescopes, Performance modeling, Wavefront sensors, Sensors, Atmospheric sciences

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Proceedings Article | 9 July 2018 Paper

Very accurate cryogenic mechanisms for CRIRES+

Jean Louis Lizon, Barbara Klein, Ignacio Molina-Conde, Ernesto Oliva, Guillem Anglada Escude, Paul Bristow, Reinhold Dorn, Roman Follert, Artie Hatzes, Ulrike Heiter, Derek Ives, Yves Jung, Matt Lockhart, Thomas Marquart, Livia Origlia, Luca Pasquini, Jerome Paufique, Nikolai Pistunov, Ansgar Reiners, Alain Smette, Jonathan Smoker, Ulf Seemann, Eric Stempels, Elena Valenti

Proceedings Volume 10701, 107012R (2018) https://doi.org/10.1117/12.2314483

KEYWORDS: Actuators, Cryogenics, Switches, Manufacturing, Mirrors, Cryogenic mechanisms, Sensors, Spectrographs, Connectors, Transducers

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Proceedings Article | 9 July 2018 Presentation

CRIRES+ on its way to VLT (Conference Presentation)

Roman Follert, Reinhold Dorn, Anna Brucalassi, Paul Bristow, Artie Hatzes, Ulf Seemann, Nikolai Piskunov, Alexis Lavail, Barbara Klein, Claudio Cumani, Christophe Moins, Derek Ives, Eric Stempels, Ernesto Oliva, Ignacio Molina-Conde, Jean Louis Lizon, Marcus Haug, Siegfried Eschbaumer, Thomas Marquart, Ulrike Heiter, Sebastien Tordo, Renate Hinterschuster, Yves Jung, Jérôme Paufique, Andreas Haimerl, Jörg Stegmeier, Jean-Paul Kirchbauer, Christoph Schmidt, Elena Valenti, Luca Pasquini, Ansgar Reiners, Heiko Anwand-Heerwart, Katja Hauptner, Tim Umlauf, Peter Jeep, Petra Rhode, Christopher Marvin

Proceedings Volume 10702, 107020E (2018) https://doi.org/10.1117/12.2314150

KEYWORDS: Adaptive optics, Space telescopes, Observatories, Spectral resolution, Telescopes, Large telescopes, Space operations, Staring arrays, Sensors, Calibration

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Proceedings Article | 6 July 2018 Paper

Full system test and early preliminary acceptance Europe results for CRIRES+

Anna Brucalassi, Reinhold Dorn, Roman Follert, Artie Hatzes, Paul Bristow, Ulf Seemann, Claudio Cumani, Siegfried Eschbaumer, Andreas Haimerl, Marcus Haug, Ulrike Heiter, Renate Hinterschuster, Derek Ives, Yves Jung, Florian Kerber, Barbara Klein, Alexis Lavail, Jean Louis Lizon, Thomas Marquart, Christophe Moins, Ignacio Molina-Conde, Ernesto Oliva, Luca Pasquini, Jérôme Paufique, Nikolai Piskunov, Jörg Stegmeier, Eric Stempels, Sebastien Tordo, Elena Valenti, Heiko Anwand-Heerwart, Katja Hauptner, Peter Jeep, Christopher Marvin, Ansgar Reiners, Petra Rhode, Christof Schmidt, Tim Umlauf

Proceedings Volume 10702, 1070239 (2018) https://doi.org/10.1117/12.2313743

KEYWORDS: Calibration, Adaptive optics, Spectrographs, Metrology, Fabry–Perot interferometers, Cryogenics, Detector arrays

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Proceedings Article | 6 July 2018 Paper

A unique infrared spectropolarimetric unit for CRIRES+

Nikolai Piskunov, Eric Stempels, Alexis Lavail, Michael Escuti, Frans Snik, Andrey Dolgopolov, Milan Rozel, Candice Durandet, Artie Hatzes, Paul Bristow, Anna Brucalassi, Claudio Cumani, Reinhold Dorn, Andreas Haimerl, Ulrike Heiter, Renate Hinterschuster, Roman Follert, Derek Ives, Yves Jung, Florian Kerber, Barbara Klein, Jean-Louis Lizon, Thomas Marquart, Ignacio Molina-Conde, Luca Pasquini, Jérôme Paufique, Ernesto Oliva, Ansgar Reiners, Ulf Seemann, Jörg Stegmeier, Sebastien Tordo, Elena Valenti

Proceedings Volume 10702, 1070234 (2018) https://doi.org/10.1117/12.2313512

KEYWORDS: Polarization, Sensors, Transmittance, Infrared radiation, Telescopes, Manufacturing, Stars, Magnetism, Adaptive optics, Infrared spectroscopy

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High-resolution infrared spectropolarimetry has many science applications in astrophysics. One of them is measuring weak magnetic fields using the Zeeman effect. Infrared domain is particularly advantageous as Zeeman splitting of spectral lines is proportional to the square of the wavelength while the intrinsic width of the line cores increases only linearly. Important science cases include detection and monitoring of global magnetic fields on solar-type stars, study of the magnetic field evolution from stellar formation to the final stages of the stellar life with massive stellar winds, and the dynamo mechanism operation across the boundary between fully- and partially-convective stars. CRIRES+ (the CRIRES upgrade project) includes a novel spectropolarimetric unit (SPU) based on polar- ization gratings. The novel design allows to perform beam-splitting very early in the optical path, directly after the tertiary mirror of the telescope (the ESO Very Large Telescope, VLT), minimizing instrumental polariza- tion. The new SPU performs polarization beam-splitting in the near-infrared while keeping the telescope beam mostly unchanged in the optical domain, making it compatible with the adaptive optics system of the CRIRES+ instrument. The SPU consists of four beam-splitters optimized for measuring circular and linear polarization of spectral lines in YJ and HK bands. The SPU can perform beam switching allowing to correct for throughput in each beam and for variations in detector pixel sensitivity. Other new features of CRIRES+, such as substantially increased wavelength coverage, stability and advanced data reduction pipeline will further enhance the sensitivity of the polarimetric mode. The combination of the SPU, CRIRES+ and the VLT is a unique facility for making major progress in understanding stellar activity. In this article we present the design of the SPU, laboratory measurements of individual components and of the whole unit as well as the performance prediction for the operation at the VLT.

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

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Proceedings Article | 6 August 2014 Paper

Wavelength calibration from 1-5μm for the CRIRES+ high-resolution spectrograph at the VLT

U. Seemann, G. Anglada-Escude, D. Baade, P. Bristow, R. Dorn, R. Follert, D. Gojak, J. Grunhut, A. Hatzes, U. Heiter, D. Ives, P. Jeep, Y. Jung, H.-U. Käufl, F. Kerber, B. Klein, J.-L. Lizon, M. Lockhart, T. Löwinger, T. Marquart, E. Oliva, J. Paufique, N. Piskunov, Eszter Pozna, A. Reiners, A. Smette, J. Smoker, E. Stempels, E. Valenti

Proceedings Volume 9147, 91475G (2014) https://doi.org/10.1117/12.2056668

KEYWORDS: Calibration, Absorption, K band, Fabry–Perot interferometers, Spectrographs, Near infrared, Fourier transforms, Spectral resolution, Molecules, Sensors

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Proceedings Article | 28 July 2014 Paper

Novel infrared polarimeter for the ESO CRIRES+ instrument

Matthew Lockhart, Nikolai Piskunov, Eric Stempels, Michael Escuti, Ernesto Oliva, Hans-Ulrich Käufl, Ulrike Heiter, Thomas Marquart, Guillem Anglada-Escude, Dietrich Baade, Paul Bristow, Reinhold Dorn, Roman Follert, Domingo Gojak, Jason Grunhut, Artie Hatzes, Michael Hilker, Derek Ives, Yves Jung, Florian Kerber, Barbara Klein, Jean-Louis Lizon, Tom Löwinger, Livia Origlia, Luca Pasquini, Jerome Paufique, Eszter Pozna, Ansgar Reiners, Ulf Seemann, Alain Smette, Jonathan Smoker, Elena Valenti

Proceedings Volume 9147, 91478P (2014) https://doi.org/10.1117/12.2056367

KEYWORDS: Polarimetry, Beam splitters, Infrared radiation, Polarization, Sensors, Adaptive optics, Telescopes, Prototyping, Monochromators, Infrared telescopes

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Proceedings Article | 24 July 2014 Paper

Opto-mechanical design of a new cross dispersion unit for the CRIRES+ high resolution spectrograph for the VLT

Jean Louis Lizon, Barbara Klein, Ernesto Oliva, Tom Löwinger, Guillem Anglada Escude, Dietrich Baade, Paul Bristow, Reinhold Dorn, Roman Follert, Jason Grunhut, Artie Hatzes, Ulrike Heiter, Derek Ives, Yves Jung, Florian Kerber, Matt Lockhart, Thomas Marquart, Livia Origlia, Luca Pasquini, Jerome Paufique, N. Piskunov, Eszter Pozna, Ansgar Reiners, Alain Smette, Jonathan Smoker, Ulf Seemann, Eric Stempels, Elena Valenti

Proceedings Volume 9147, 91477S (2014) https://doi.org/10.1117/12.2054800

KEYWORDS: Sensors, Cryogenics, Cameras, Lenses, Spectrographs, Interfaces, Mirrors, Optomechanical design, Optical design, Aluminum

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Proceedings Article | 24 July 2014 Paper

Concept and optical design of the cross-disperser module for CRIRES+

E. Oliva, A. Tozzi, D. Ferruzzi, L. Origlia, A. Hatzes, R. Follert, T. Löwinger, N. Piskunov, U. Heiter, M. Lockhart, T. Marquart, E. Stempels, A. Reiners, G. Anglada-Escude, Ulf Seemann, R. Dorn, P. Bristow, D. Baade, B. Delabre, D. Gojak, J. Grunhut, Barbara Klein, M. Hilker, D. Ives, Y. Jung, H.-U. Kaeufl, F. Kerber, J. Lizon, L. Pasquini, J. Paufique, Eszter Pozna, A. Smette, J. Smoker, E. Valenti

Proceedings Volume 9147, 91477R (2014) https://doi.org/10.1117/12.2054381

KEYWORDS: Cameras, Tolerancing, Mirrors, Optical filters, Spectroscopy, Optical components, Optical design, Infrared spectroscopy, Sensors, Coating

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Proceedings Article | 8 July 2014 Paper

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

R. Follert, R. Dorn, E. Oliva, J. Lizon, A. Hatzes, N. Piskunov, A. Reiners, U. Seemann, E. Stempels, U. Heiter, T. Marquart, M. Lockhart, G. Anglada-Escude, T. Löwinger, D. Baade, J. Grunhut, P. Bristow, B. Klein, Y. Jung, D. Ives, F. Kerber, Eszter Pozna, J. Paufique, H. Kaeufl, L. Origlia, E. Valenti, D. Gojak, M. Hilker, L. Pasquini, A. Smette, J. Smoker

Proceedings Volume 9147, 914719 (2014) https://doi.org/10.1117/12.2054197

KEYWORDS: Spectrographs, Infrared spectroscopy, Stars, Sensors, Infrared radiation, Calibration, Adaptive optics, Planets, Magnetism, Absorption

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Proceedings Article | 8 July 2014 Paper

ERIS: preliminary design phase overview

Harald Kuntschner, Lieselotte Jochum, Paola Amico, Johannes Dekker, Florian Kerber, Enrico Marchetti, Matteo Accardo, Roland Brast, Martin Brinkmann, Ralf Conzelmann, Bernard Delabre, Michel Duchateau, Enrico Fedrigo, Gert Finger, Christoph Frank, Fernando Rodriguez, Barbara Klein, Jens Knudstrup, Miska Le Louarn, Lars Lundin, Andrea Modigliani, Michael Müller, Mark Neeser, Sebastien Tordo, Elena Valenti, Frank Eisenhauer, Eckhard Sturm, Helmut Feuchtgruber, Elisabeth George, Michael Hartl, Reiner Hofmann, Heinrich Huber, Markus Plattner, Josef Schubert, Karl Tarantik, Erich Wiezorrek, Michael Meyer, Sascha Quanz, Adrian Glauser, Harald Weisz, Simone Esposito, Marco Xompero, Guido Agapito, Jacopo Antichi, Valdemaro Biliotti, Marco Bonaglia, Runa Briguglio, Luca Carbonaro, Giovanni Cresci, Luca Fini, Enrico Pinna, Alfio Puglisi, Fernando Quirós-Pacheco, Armando Riccardi, Gianluca Di Rico, Carmelo Arcidiacono, Mauro Dolci

Proceedings Volume 9147, 91471U (2014) https://doi.org/10.1117/12.2055140

KEYWORDS: Adaptive optics, Sensors, Calibration, Mirrors, Stars, Spectrographs, Cameras, Wavefront sensors, Infrared sensors, Telescopes

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The Enhanced Resolution Imager and Spectrograph (ERIS) is the next-generation adaptive optics near-IR imager and spectrograph for the Cassegrain focus of the Very Large Telescope (VLT) Unit Telescope 4, which will soon make full use of the Adaptive Optics Facility (AOF). It is a high-Strehl AO-assisted instrument that will use the Deformable Secondary Mirror (DSM) and the new Laser Guide Star Facility (4LGSF). The project has been approved for construction and has entered its preliminary design phase. ERIS will be constructed in a collaboration including the Max- Planck Institut für Extraterrestrische Physik, the Eidgenössische Technische Hochschule Zürich and the Osservatorio Astrofisico di Arcetri and will offer 1 - 5 μm imaging and 1 - 2.5 μm integral field spectroscopic capabilities with a high Strehl performance. Wavefront sensing can be carried out with an optical high-order NGS Pyramid wavefront sensor, or with a single laser in either an optical low-order NGS mode, or with a near-IR low-order mode sensor. Due to its highly sensitive visible wavefront sensor, and separate near-IR low-order mode, ERIS provides a large sky coverage with its 1’ patrol field radius that can even include AO stars embedded in dust-enshrouded environments. As such it will replace, with a much improved single conjugated AO correction, the most scientifically important imaging modes offered by NACO (diffraction limited imaging in the J to M bands, Sparse Aperture Masking and Apodizing Phase Plate (APP) coronagraphy) and the integral field spectroscopy modes of SINFONI, whose instrumental module, SPIFFI, will be upgraded and re-used in ERIS. As part of the SPIFFI upgrade a new higher resolution grating and a science detector replacement are envisaged, as well as PLC driven motors. To accommodate ERIS at the Cassegrain focus, an extension of the telescope back focal length is required, with modifications of the guider arm assembly. In this paper we report on the status of the baseline design. We will also report on the main science goals of the instrument, ranging from exoplanet detection and characterization to high redshift galaxy observations. We will also briefly describe the SINFONI-SPIFFI upgrade strategy, which is part of the ERIS development plan and the overall project timeline.

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

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