TY - CONF
T1 - High contrast imaging upgrades for the Keck adaptive optics imager
AU - Ragland, Sam
AU - Mawet, Dimitri
AU - Alvarez, Carlos
AU - Matthews, Keith
AU - Bond, Charlotte Z.
AU - Cetre, Sylvain
AU - Delorme, Jacques Robert
AU - Lilley, Scott
AU - Jovanovic, Nemanja
AU - Ruane, Garreth
AU - Absil, Olivier
AU - Chun, Mark
AU - Echeverri, Daniel
AU - Goebel, Sean
AU - Guyon, Olivier
AU - Karlsson, Mikael
AU - Lockhart, Charles
AU - Millar-Blanchaer, Maxwell
AU - Taheri, Mojtaba
AU - Kent Wallace, J.
AU - Warmbier, Eric
AU - Wetherell, Ed
AU - Wizinowich, Peter
N1 - Funding Information:
The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Publisher Copyright:
© 2019 AO4ELT 2019 - Proceedings 6th Adaptive Optics for Extremely Large Telescopes. All rights reserved.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - Coronagraph
KW - High-contrast imaging
KW - Keck planet imager and characterizer
KW - Pyramid wavefront sensor
KW - Vortex phase mask
UR - http://www.scopus.com/inward/record.url?scp=85084944263&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85084944263&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85084944263
T2 - 6th International Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2019
Y2 - 9 June 2019 through 14 June 2019
ER -