Article (Scientific journals)
Single conjugate adaptive optics for the ELT instrument METIS
Hippler, Stefan; Feldt, Markus; Bertram, Thomas et al.
2018In Experimental Astronomy
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Keywords :
Single conjugate adaptive optics; SCAO; ELT; Pyramid wavefront sensor; Shack-Hartmann wavefront sensor; Fragmented pupil; Low wind effect; Non-common path aberrations; High-contrast imaging
Abstract :
[en] The European Extremely Large Telescope (ELT) is a 39m large, ground-based optical and near- to mid-infrared telescope under construction in the Chilean Atacama desert. Operation is planned to start around the middle of the next decade. All first light instruments will come with wavefront sensing devices that allow control of the ELT's intrinsic M4 and M5 wavefront correction units, thus building an adaptive optics (AO) system. To take advantage of the ELT's optical performance, full diffraction-limited operation is required and only a high performance AO system can deliver this. Further technically challenging requirements for the AO come from the exoplanet research field, where the task to resolve the very small angular separations between host star and planet, has also to take into account the high-contrast ratio between the two objects. We present in detail the results of our simulations and their impact on high-contrast imaging in order to find the optimal wavefront sensing device for the METIS instrument. METIS is the mid-infrared imager and spectrograph for the ELT with specialised high-contrast, coronagraphic imaging capabilities, whose performance strongly depends on the AO residual wavefront errors. We examined the sky and target sample coverage of a generic wavefront sensor in two spectral regimes, visible and near-infrared, to pre-select the spectral range for the more detailed wavefront sensor type analysis. We find that the near-infrared regime is the most suitable for METIS. We then analysed the performance of Shack-Hartmann and pyramid wavefront sensors under realistic conditions at the ELT, did a balancing with our scientific requirements, and concluded that a pyramid wavefront sensor is the best choice for METIS. For this choice we additionally examined the impact of non-common path aberrations, of vibrations, and the long-term stability of the SCAO system including high-contrast imaging performance.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hippler, Stefan;  Max-Planck-Institut für Astronomie, Heidelberg, Germany
Feldt, Markus;  Max-Planck-Institut für Astronomie, Heidelberg, Germany
Bertram, Thomas;  Max-Planck-Institut für Astronomie, Heidelberg, Germany
Brandner, Wolfgang;  Max-Planck-Institut für Astronomie, Heidelberg, Germany
Cantalloube, Faustine;  Max-Planck-Institut für Astronomie, Heidelberg, Germany
Carlomagno, Brunella ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Obereder, Andreas;  MathConsult GmbH, Linz, Austria
Shatokhina, Iuliia;  Industrial Mathematics Institute, Johannes Kepler University Linz, Linz, Austria
Stuik, Remko;  Leiden Observatory, Leiden University, Leiden, The Netherlands)
Language :
English
Title :
Single conjugate adaptive optics for the ELT instrument METIS
Publication date :
20 November 2018
Journal title :
Experimental Astronomy
ISSN :
0922-6435
eISSN :
1572-9508
Publisher :
Kluwer Academic Publishers, Netherlands
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy
Funders :
CE - Commission Européenne [BE]
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