Poster (Scientific congresses and symposiums)
Performance evaluation of mid-IR vortex coronagraphs with centrally obscured segmented pupils
Carlomagno, Brunella; Absil, Olivier; Ruane, Garreth J. et al.
2015AO4ELT4 International Conference
 

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Keywords :
Instrumentation:infrared vortex coronagraph; End-to-end performance simulations
Abstract :
[en] In its original design, the E-ELT/Metis instrument envisages a vortex coronagraph in the mid-IR regime for detection and characterization of exoplanets, with a contrast of 1e-4 at 2 lambda/D (~40 mas in L band). The AGPM (Annular Groove Phase Mask) is a vortex phase mask with impressive characteristics: small inner working angle, high throughput, achromaticity. A non-perfectly circular pupil and non-flat input wavefront result in a starlight leakage, degrading the performance of the vortex coronagraph. In this work, we present end-to-end performance simulations using Fourier optical propagation to determine the quality of the starlight rejection obtained with an infrared vortex coronagraph. We first analyse the performance facing E-ELT pupil variations (segmentations, central obscuration, spiders, missing segments), then pointing jitter and random adaptive optics residual phase screens are introduced to derive more realistic performance. Finally, more advanced concepts of the infrared vortex coronagraph are presented, in order to compensate for performance degradation.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Carlomagno, Brunella ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Absil, Olivier  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Ruane, Garreth J.
Mawet, Dimitri
Feldt, Markus
Hippler, Stefan
Delacroix, Christian
Forsberg, Pontus
Habraken, Serge ;  Université de Liège > Département de physique > Optique - Hololab
Huby, Elsa ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Karlsson, Mikael
Surdej, Jean  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Vargas Catalan, Ernesto
More authors (3 more) Less
Language :
English
Title :
Performance evaluation of mid-IR vortex coronagraphs with centrally obscured segmented pupils
Publication date :
October 2015
Number of pages :
A0
Event name :
AO4ELT4 International Conference
Event place :
Lake Arrowhead, California, United States
Event date :
from 25-10-2015 to 30-10-2015
Audience :
International
Name of the research project :
VORTEX
Available on ORBi :
since 17 May 2016

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