The W. M. Keck Observatory infrared vortex coronagraph and a first image of HIP79124 B

[en] 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 HIP79124, which had previously been detected by means of interferometry. With HIP79124 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Serabyn, Eugene

Huby, Elsa ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Matthews, Keith

Mawet, Dimitri

Absil, Olivier ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Femenia, Bruno

Wizinowich, Peter

Karlsson, Mikael

Bottom, Michael

Campbell, Randy

More authors (15 more)

Language :

English

Title :

The W. M. Keck Observatory infrared vortex coronagraph and a first image of HIP79124 B

Publication date :

04 January 2017

Journal title :

Astronomical Journal

ISSN :

0004-6256

eISSN :

1538-3881

Publisher :

Institute of Physics (IoP), Bristol, United Kingdom

Volume :

153

Issue :

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2016arXiv161203093S

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

Available on ORBi :

since 04 February 2017

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