Article (Scientific journals)
Design, pointing control, and on-sky performance of the mid-infrared vortex coronagraph for the VLT/NEAR experiment
Maire, Anne-Lise; Huby, Elsa; Absil, Olivier et al.
2020In Journal of Astronomical Telescopes, Instruments, and Systems, 6 (3), p. 035003
Peer Reviewed verified by ORBi
 

Files


Full Text
JATIS-20036_online.pdf
Publisher postprint (4.1 MB)
Download

Copyright 2020 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.


All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
adaptive optics; infrared imaging; data processing; simulations
Abstract :
[en] Vortex coronagraphs have been shown to be a promising avenue for high- contrast imaging in the close-in environment of stars at thermal infrared (IR) wavelengths. They are included in the baseline design of the mid-infrared extremely large telescope imager and spectrograph. To ensure good performance of these coronagraphs, a precise control of the centering of the star image in real time is needed. We previously developed and validated the quadrant analysis of coronagraphic images for tip-tilt sensing estimator (QACITS) pointing estimator to address this issue. While this approach is not wavelength-dependent in theory, it was never implemented for mid-IR observations, which leads to specific challenges and limitations. Here, we present the design of the mid-IR vortex coronagraph for the "new Earths in the α Cen Region (NEAR) experiment with the Very Large Telescope (VLT)/Very Large Telescope imager and spectrometer for the mid-infrared (VISIR) instrument and assess the performance of the QACITS estimator for the centering control of the star image onto the vortex coronagraph. We use simulated data and on-sky data obtained with VLT/VISIR, which was recently upgraded for observations assisted by adaptive optics in the context of the NEAR experiment. We demonstrate that the QACITS-based correction loop is able to control the centering of the star image onto the NEAR vortex coronagraph with a stability down to 0.015 λ / D rms over 4 h in good conditions. These results show that QACITS is a robust approach for precisely controlling in real time the centering of vortex coronagraphs for mid-IR observations.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Maire, Anne-Lise ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Huby, Elsa;  Université PSL, CNRS, Sorbonne Université, Université de Paris, LESIA, Observatoire de Paris, Meudon, France
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Zins, Gérard;  European Southern Observatory, Vitacura, Chile
Kasper, Markus;  European Southern Observatory, Garching bei München, Germany
Delacroix, Christian  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Leveratto, Serban;  European Southern Observatory, Garching bei München, Germany
Karlsson, Mikael;  Uppsala University, Angström Laboratory, Department of Materials Science and Engineering, Uppsala, Sweden
Ruane, Garreth;  Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States
Käufl, Hans-Ulrich;  European Southern Observatory, Garching bei München, Germany
Orban De Xivry, Gilles  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Pathak, Prashant;  European Southern Observatory, Garching bei München, Germany
Pettazzi, Lorenzo;  European Southern Observatory, Garching bei München, Germany
Duhoux, Philippe;  European Southern Observatory, Garching bei München, Germany
Kolb, Johan;  European Southern Observatory, Vitacura, Chile
Pantin, Éric;  Université Paris-Saclay, Université Paris Diderot, Laboratoire CEA, IRFU/DAp, AIM, CNRS, Gif-sur-Yvette, France
Riggs, A. J. Eldorado;  Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States
Siebenmorgen, Ralf;  European Southern Observatory, Garching bei München, Germany
Mawet, Dimitri;  Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States)
More authors (9 more) Less
Language :
English
Title :
Design, pointing control, and on-sky performance of the mid-infrared vortex coronagraph for the VLT/NEAR experiment
Publication date :
16 September 2020
Journal title :
Journal of Astronomical Telescopes, Instruments, and Systems
ISSN :
2329-4124
eISSN :
2329-4221
Publisher :
SPIE, United States - Washington
Volume :
6
Issue :
3
Pages :
035003
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 819155 - EPIC - Earth-like Planet Imaging with Cognitive computing, FP7 ; 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy
Name of the research project :
EPIC; NNExI
Funders :
CER - Conseil Européen de la Recherche [BE]
FWB - Fédération Wallonie-Bruxelles [BE]
CE - Commission Européenne [BE]
Available on ORBi :
since 07 October 2020

Statistics


Number of views
79 (8 by ULiège)
Number of downloads
50 (5 by ULiège)

Scopus citations®
 
9
Scopus citations®
without self-citations
0
OpenCitations
 
3

Bibliography


Similar publications



Contact ORBi