Commissioning and first light results of an L'-band vortex coronagraph with the Keck II adaptive optics NIRC2 science instrument
AuthorFemenía Castellá, Bruno
Gomez Gonzalez, Carlos
Vargas Catalan, Ernesto
AffiliationUniv Arizona, Steward Observ
MetadataShow full item record
PublisherSPIE-INT SOC OPTICAL ENGINEERING
CitationBruno Femenía Castellá ; Eugene Serabyn ; Dimitri Mawet ; Olivier Absil ; Peter Wizinowich ; Keith Matthews ; Elsa Huby ; Michael Bottom ; Randy Campbell ; Dwight Chan ; Brunella Carlomagno ; Sylvain Cetre ; Denis Defrère ; Christian Delacroix ; Carlos Gomez Gonzalez ; Aïssa Jolivet ; Mikael Karlsson ; Kyle Lanclos ; Scott Lilley ; Steven Milner ; Henry Ngo ; Maddalena Reggiani ; Julia Simmons ; Hien Tran ; Ernesto Vargas Catalan and Olivier Wertz " Commissioning and first light results of an L'-band vortex coronagraph with the Keck II adaptive optics NIRC2 science instrument ", Proc. SPIE 9909, Adaptive Optics Systems V, 990922 (July 26, 2016); doi:10.1117/12.2233228; http://dx.doi.org/10.1117/12.2233228
JournalADAPTIVE OPTICS SYSTEMS V
Rights© 2016 SPIE
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractOn 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 3.7 mu m. 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.
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