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High Contrast Imaging with the New Vortex Coronagraph on NACO

Mawet, Dimitri (2013) High Contrast Imaging with the New Vortex Coronagraph on NACO. Messenger, 152 (6). pp. 8-13. ISSN 0722-6691.

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The installation and successful commissioning of an L'-band annular groove phase mask (AGPM) coronagraph on VLT/NACO is presented. The AGPM is a vector vortex coronagraph made from diamond sub-wavelength gratings tuned to the L'-band. The vector vortex coronagraph enables high-contrast imaging at very small inner working angles (here 0.09 arcseconds, the diffraction limit of the VLT at L'), potentially opening up a new parameter space in high-resolution imaging. During technical and science verification runs, we discovered a late-type companion at two beamwidths from an F0V star, and imaged the inner regions of β Pictoris down to the previously unexplored projected radius of 1.75 astronomical units. The circumstellar disc of β Pic was also resolved from 1 to 5 arcseconds. These results showcase the potential of the NACO L'-band AGPM over a wide range of spatial scales.

Item Type:Article
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Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2013 European Southern Observatory.
Issue or Number:6
Record Number:CaltechAUTHORS:20150527-093543432
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57850
Deposited By: Ruth Sustaita
Deposited On:27 May 2015 17:12
Last Modified:03 Oct 2019 08:29

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