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Proceedings Paper

Around the world: status and prospects with the infrared vortex coronagraph (Conference Presentation)
Author(s): Olivier Absil; Mikael Karlsson; Dimitri Mawet; Brunella Carlomagno; Valentin Christiaens; Denis Defrère; Christian Delacroix; Julien Girard; Carlos A. Gomez Gonzalez; Serge Habraken; Philip Hinz; Elsa Huby; Aissa Jolivet; Markus Kasper; Hans-Ulrich Kaufl; Matthew Kenworthy; Keith Matthews; Julien Milli; Gilles Orban de Xivry; Eric Pantin; Pierre Piron; Maddalena Reggiani; A.J. Eldorado Riggs; Eugene Serabyn; Jean Surdej; Ernesto Vargas Catalan

Paper Abstract

Since its first light at the VLT in 2012, the Annular Groove Phase Mask (AGPM) has been used to implement vortex coronagraphy into AO-assisted infrared cameras at two additional world-leading observatories: the Keck Observatory and the LBT. In this paper, we review the status of these endeavors, and briefly highlight the main scientific results obtained so far. We explore the performance of the AGPM vortex coronagraph as a function of instrumental constraints, and identify the main limitations to the sensitivity to faint, off-axis companions in high-contrast imaging. These limitations include the AGPM itself, non-common path aberrations, as well as the data processing pipeline; we briefly describe our on-going efforts to further improve these various aspects. Based on the lessons learned from the first five years of on-sky exploitation of the AGPM, we are now preparing its implementation in a new generation of high-contrast imaging instruments. We detail the specificities of these instruments, and how they will enable the full potential of vortex coronagraphy to be unleashed in the future. In particular, we explain how the AGPM will be used to hunt for planets in the habitable zone of alpha Centauri A and B with a refurbished, AO-assisted version of the VISIR mid-infrared camera at the VLT (aka the NEAR project), and how this project paves the way towards mid-infrared coronagraphy on the ELT with the METIS instrument. We also discuss future LM-band applications of the AGPM with VLT/ERIS, ELT/METIS, and with a proposed upgrade of Keck/NIRC2, as well as future applications at shorter wavelengths, such as a possible upgrade of VLT/SPHERE with a K-band AGPM.

Paper Details

Date Published: 9 July 2018
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107020T (9 July 2018); doi: 10.1117/12.2312783
Show Author Affiliations
Olivier Absil, Univ. de Liège (Belgium)
Mikael Karlsson, Uppsala Univ. (Sweden)
Dimitri Mawet, Caltech (United States)
Brunella Carlomagno, Univ. de Liège (Belgium)
Valentin Christiaens, Univ. de Liège (Belgium)
Univ. de Chile (Chile)
Denis Defrère, Univ. de Liège (Belgium)
Christian Delacroix, Princeton Univ. (United States)
Julien Girard, Space Telescope Science Institute (United States)
Carlos A. Gomez Gonzalez, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Serge Habraken, Univ. de Liège (Belgium)
Philip Hinz, The Univ. of Arizona (United States)
Elsa Huby, Observatoire de Paris (France)
Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique (France)
Aissa Jolivet, Univ. de Liège (Belgium)
Markus Kasper, European Southern Observatory (Germany)
Hans-Ulrich Kaufl, European Southern Observatory (Germany)
Matthew Kenworthy, Leiden Univ. (Netherlands)
Keith Matthews, Caltech (United States)
Julien Milli, European Southern Observatory (Chile)
Gilles Orban de Xivry, Univ. de Liège (Belgium)
Eric Pantin, Commissariat à l'Énergie Atomique (France)
Pierre Piron, Uppsala Univ. (Sweden)
Maddalena Reggiani, Univ. de Liège (Belgium)
A.J. Eldorado Riggs, Jet Propulsion Lab. (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)
Jean Surdej, Univ. de Liège (Belgium)
Ernesto Vargas Catalan, Uppsala Univ. (Sweden)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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