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Commissioning and first light results of an L'-band vortex coronagraph with the Keck II adaptive optics NIRC2 science instrument
Femenía Castellá, Bruno; Serabyn, Eugene; Mawet, Dimitri et al.
2016In Marchetti, E.; Close, L.; Véran, J.-P. (Eds.) Adaptive Optics Systems V
 

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Keywords :
W. M. Keck Observatory; NIRC2; high-contrast imaging; coronagraph; vortex phase mask
Abstract :
[en] On March 2015 an L'-band vortex coronagraph based on an Annular Groove Phase Mask made up of a diamond sub-wavelength grating was installed on NIRC2 as a demonstration project. This vortex coronagraph operates in the L' band not only in order to take advantage from the favorable star/planet contrast ratio when observing beyond the K band, but also to exploit the fact that the Keck II Adaptive Optics (AO) system delivers nearly extreme adaptive optics image quality (Strehl ratios values near 90%) at 3.7μm. We describe the hardware installation of the vortex phase mask during a routine NIRC2 service mission. The success of the project depends on extensive software development which has allowed the achievement of exquisite real-time pointing control as well as further contrast improvements by using speckle nulling to mitigate the effect of static speckles. First light of the new coronagraphic mode was on June 2015 with already very good initial results. Subsequent commissioning nights were interlaced with science nights by members of the VORTEX team with their respective scientific programs. The new capability and excellent results so far have motivated the VORTEX team and the Keck Science Steering Committee (KSSC) to offer the new mode in shared risk mode for 2016B.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Femenía Castellá, Bruno;  W. M. Keck Observatory (United States)
Serabyn, Eugene;  Jet Propulsion Lab. (United States)
Mawet, Dimitri;  California Institute of Technology (United States)
Absil, Olivier  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Wizinowich, Peter;  W. M. Keck Observatory (United States)
Matthews, Keith;  California Institute of Technology (United States)
Huby, Elsa ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Bottom, Michael;  California Institute of Technology (United States)
Campbell, Randy;  W. M. Keck Observatory (United States)
Chan, Dwight;  W. M. Keck Observatory (United States)
Carlomagno, Brunella ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Cetre, Sylvain;  W. M. Keck Observatory (United States)
Defrere, Denis ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Delacroix, Christian  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Gómez González, Carlos ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Jolivet, Aïssa ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Karlsson, Mikael;  Uppsala Univ. (Sweden)
Lanclos, Kyle;  W. M. Keck Observatory (United States)
Lilley, Scott;  W. M. Keck Observatory (United States)
Milner, Steven;  W. M. Keck Observatory (United States)
Ngo, Henry;  California Institute of Technology (United States)
Reggiani, Maddalena ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Simmons, Julia;  W. M. Keck Observatory (United States)
Tran, Hien;  W. M. Keck Observatory (United States)
Vargas Catalan, Ernesto;  Uppsala Univ. (Sweden)
Wertz, Olivier;  Univ. of Liège (Belgium))
More authors (16 more) Less
Language :
English
Title :
Commissioning and first light results of an L'-band vortex coronagraph with the Keck II adaptive optics NIRC2 science instrument
Publication date :
26 July 2016
Event name :
SPIE Astronomical Telescopes and Instrumentation 2016
Event organizer :
SPIE
Event place :
Glasgow, United Kingdom
Event date :
26/6/2016 - 1/7/2016
Audience :
International
Main work title :
Adaptive Optics Systems V
Author, co-author :
Marchetti, E.
Close, L.
Véran, J.-P.
Publisher :
SPIE, Bellingham, United Kingdom
ISBN/EAN :
9781510601970
Collection name :
Proceedings of SPIE, volume 9909
Pages :
990922
European Projects :
FP7 - 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy
Name of the research project :
VORTEX
Funders :
CE - Commission Européenne [BE]
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