The VLT/ERIS vortex coronagraph: design, pointing control, and on-sky performance

被引：0

作者：

de Xivry, Gilles Orban ^{[1
]}

Absil, Olivier ^{[1
]}

De Rosa, Raffaele J. ^{[2
]}

Bonse, M. J. ^{[3
,11
]}

Dannert, F. ^{[3
]}

Hayoz, J. ^{[3
]}

Grani, P. ^{[4
]}

Puglisi, A. ^{[4
]}

Baruffolo, A. ^{[5
]}

Salasnich, B. ^{[5
]}

Davies, R. ^{[6
]}

Glauser, A. M. ^{[3
]}

Huby, E. ^{[7
]}

Kenworthy, M. ^{[8
]}

Quanz, S. P. ^{[3
]}

Taylor, W. ^{[9
]}

Zins, G. ^{[10
]}

机构：

[1] Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee Six Aout 19c, B-4000 Liege, Belgium

[2] European Southern Observ, Alonso de Cordova 3107, Santiago, Chile

[3] Swiss Fed Inst Technol, Inst Particle Phys & Astrophys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[4] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[5] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[6] Max Planck Inst Extraterr Phys, Postfach 1312, D-85741 Garching, Germany

[7] Univ Paris, Sorbonne Univ, Univ PSL, CNRS,LESIA,Observ Paris, 5 Pl Janssen, F-92195 Meudon, France

[8] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[9] Royal Observ Edinburgh, STFC UK ATC, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[10] European Southern Observ, Karl Schwarzschildstr 2, D-85748 Garching, Germany

[11] Max Planck Inst Intelligent Syst, Max Planck Ring 4, D-72076 Tubingen, Germany

来源：

ADAPTIVE OPTICS SYSTEMS IX | 2024年 / 13097卷

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

high-contrast imaging; coronagraph; mid-infrared imaging; observational;

D O I：

10.1117/12.3018265

中图分类号：

TP18 [人工智能理论];

学科分类号：

081104 ; 0812 ; 0835 ; 1405 ;

摘要：

The Enhanced Resolution Imager and Spectrograph (ERIS) is the new near-infrared instrument at the VLT-UT4. ERIS replaces and extends the observational capabilities formerly provided by SINFONI and NACO: integral field spectroscopy at 1 - 2.5 mu m, imaging at 1 - 5 mu m with several options for high-contrast imaging, and long-slit spectroscopy. In particular, a vortex coronagraph is now available for high contrast observations at L and M band. It is implemented using annular groove (or vortex) phase masks (one for each of the L and M bands) in a focal plane, and a Lyot stop in a downstream pupil plane. The vortex coronagraph has a discovery space starting already at similar to 1 lambda/D, and works well in broadbands. However, to reach its optimal performance, it is critical to correct for slow pointing errors onto the vortex phase mask, which mandates a dedicated pointing control strategy. To do so, a control loop based on the QACITS algorithm has been developed and commissioned for ERIS. Good pointing stability is now regularly achieved with errors between 0.01 and 0.02./D and a correction rate of 0.2 Hz. In this contribution, we first review the design of the ERIS vortex coronagraph. We then detail the implementation of the QACITS algorithm describing the entire observing sequence, including the calibration steps, the initial centering, and the stabilization during the observing template. We then discuss performance based on commissioning data in terms of pointing accuracy and stability. Finally, we present post-processed contrast curves obtained during commissioning and compare them with NACO vortex data, showing a significant improvement of about 1 mag at all separations.

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