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The W. M. Keck Observatory Infrared Vortex Coronagraph and a First Image of HIP 79124 B

Serabyn, E. and Huby, E. and Matthews, K. and Mawet, D. and Absil, O. and Femenia, B. and Wizinowich, P. and Karlsson, M. and Bottom, M. and Campbell, R. and Carlomagno, B. and Defrère, D. and Delacroix, C. and Forsberg, P. and Gomez Gonzalez, C. and Habraken, S. and Jolivet, A. and Liewer, K. and Lilley, S. and Piron, P. and Reggiani, M. and Surdej, J. and Tran, H. and Vargas Catalán, E. and Wertz, O. (2017) The W. M. Keck Observatory Infrared Vortex Coronagraph and a First Image of HIP 79124 B. Astronomical Journal, 153 (1). Art. no. 43. ISSN 0004-6256. doi:10.3847/1538-3881/153/1/43.

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An optical vortex coronagraph has been implemented within the NIRC2 camera on the Keck II telescope and used to carry out on-sky tests and observations. The development of this new L'-band observational mode is described, and an initial demonstration of the new capability is presented: a resolved image of the low-mass companion to HIP 79124, which had previously been detected by means of interferometry. With HIP 79124 B at a projected separation of 186.5 mas, both the small inner working angle of the vortex coronagraph and the related imaging improvements were crucial in imaging this close companion directly. Due to higher Strehl ratios and more relaxed contrasts in L' band versus H band, this new coronagraphic capability will enable high-contrast, small-angle observations of nearby young exoplanets and disks on a par with those of shorter-wavelength extreme adaptive optics coronagraphs.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mawet, D.0000-0002-8895-4735
Absil, O.0000-0002-4006-6237
Wizinowich, P.0000-0002-1646-442X
Karlsson, M.0000-0002-2011-0851
Bottom, M.0000-0003-1341-5531
Campbell, R.0000-0002-3289-5203
Defrère, D.0000-0003-3499-2506
Gomez Gonzalez, C.0000-0003-2050-1710
Reggiani, M.0000-0003-2911-0898
Surdej, J.0000-0002-7005-1976
Wertz, O.0000-0003-3849-2285
Additional Information:© 2017. The American Astronomical Society. Received 2016 August 3; revised 2016 October 26; accepted 2016 November 21; published 2017 January 4. We thank the Keck Science Steering Committee for their approval of this project, and especially J. Cohen for her support in getting this project off the drawing board. We also thank the director of the Caltech Optical Observatories, Shri Kulkarni, for providing test time for this new mode. Finally, we thank the W.M. Keck Observatory staff for their able and enthusiastic assistance with the observations. 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. The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (ERC Grant Agreement n. 337569), the French Community of Belgium through an ARC grant for Concerted Research Action, and the Swedish Research Council (VR) through project grant 621-2014-5959. Part of this work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.
Group:Astronomy Department
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
European Research Council (ERC)337569
Communauté française de Belgique – Actions de recherche concertéesUNSPECIFIED
Swedish Research Council621-2014-5959
Subject Keywords:instrumentation: adaptive optics
Issue or Number:1
Record Number:CaltechAUTHORS:20170104-112311784
Persistent URL:
Official Citation:E. Serabyn et al 2017 AJ 153 43
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73207
Deposited By: George Porter
Deposited On:04 Jan 2017 20:47
Last Modified:11 Nov 2021 05:13

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