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High contrast imaging upgrades for the Keck adaptive optics imager
Ragland, S.; Mawet, D.; Alvarez, C. et al.
2019In AO4ELT 2019 - Proceedings 6th Adaptive Optics for Extremely Large Telescopes
 

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Keywords :
Keck planet imager and characterizer; Pyramid wavefront sensor; High-contrast imaging; Coronagraph; Vortex phase mask
Abstract :
[en] The Keck II adaptive optics (AO) system is being upgraded with a near-infrared Pyramid Wavefront Sensor (PWS) as part of the Keck Planet Imager and Characterizer (KPIC) upgrade. The overview of the KPIC project and the PWS development are presented elsewhere in this conference. This paper focuses on improvements made to the NIRC2 science instrument, referred to as the NIRC2 upgrade, aimed at enhancing its high contrast imaging capabilities. The NIRC2 upgrade incorporates new coronagraphic elements that reach their maximum performance when operated in combination with the new near-infrared PWS and polarimetric elements that would add polarimetric capability when fully implemented. The key elements to the NIRC2 upgrade are the installation of two next-generation Vector Vortex Coronographic (VVC) masks, one optimized for the L and M band, and the other one optimized for the K band. Also key to the upgrade is the incorporation of a new Lyot stop optimized to minimize diffraction and residual nutation of the Keck-II telescope pupil. These new elements provide improved coronographic performance when operated with the new PWS and the existing Shack Hartmann wavefront sensor (SH WFS). The upgrade implementation and preliminary on-sky results are discussed. © 2019 AO4ELT 2019 - Proceedings 6th Adaptive Optics for Extremely Large Telescopes. All rights reserved.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ragland, S.;  W.M. Keck Observatory, Kamuela, HI, United States
Mawet, D.;  California Institute of TechnologyCA, United States, Jet Propulsion LaboratoryCA, United States
Alvarez, C.;  W.M. Keck Observatory, Kamuela, HI, United States
Matthews, K.;  California Institute of TechnologyCA, United States
Bond, C. Z.;  W.M. Keck Observatory, Kamuela, HI, United States
Cetre, S.;  W.M. Keck Observatory, Kamuela, HI, United States
Delorme, J.-R.;  W.M. Keck Observatory, Kamuela, HI, United States, California Institute of TechnologyCA, United States
Lilley, S.;  W.M. Keck Observatory, Kamuela, HI, United States
Jovanovic, N.;  California Institute of TechnologyCA, United States
Ruane, G.;  Jet Propulsion LaboratoryCA, United States
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Chun, M.;  University of HawaiiHI, United States
Echeverri, D.;  California Institute of TechnologyCA, United States
Goebel, S.;  University of HawaiiHI, United States
Guyon, O.;  Subaru TelescopeHI, United States
Karlsson, M.;  Uppsala University, Sweden
Lockhart, C.;  University of HawaiiHI, United States
Millar-Blanchaer, M.;  Jet Propulsion LaboratoryCA, United States
Taheri, M.;  University of Victoria, Canada
Kent Wallace, J.;  Jet Propulsion LaboratoryCA, United States
Warmbier, E.;  University of HawaiiHI, United States
Wetherell, E.;  W.M. Keck Observatory, Kamuela, HI, United States
Wizinowich, P.;  W.M. Keck Observatory, Kamuela, HI, United States
More authors (13 more) Less
Language :
English
Title :
High contrast imaging upgrades for the Keck adaptive optics imager
Publication date :
2019
Event name :
6th International Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2019
Event date :
10-06-2019 to 14-06-2019
Audience :
International
Main work title :
AO4ELT 2019 - Proceedings 6th Adaptive Optics for Extremely Large Telescopes
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