The Four-Quadrant Phase Mask Coronagraph. IV. First Light at the Very Large Telescope

Details The Four-Quadrant Phase Mask Coronagraph. IV. First Light at the Very Large Telescope The Four-Quadrant Phase Mask Coronagraph. IV. First Light at the Very Large Telescope

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasp..116.1061b&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 116, Issue 825, pp. 1061-1071.

Physics

Optics

31

Instrumentation: High Angular Resolution, Instrumentation: Adaptive Optics, Techniques: Interferometric, Stars: Individual: Henry Draper Number: Hd 100546, Stars: Individual (Hip 1306), Stars: Individual (Hip 27758)

Scientific paper

We present the first high-contrast images obtained at the ESO Very Large Telescope using a four-quadrant phase mask coronagraph. The two-night commissioning was carried out in 2004 January on NACO, the near-IR camera with adaptive optics at UT4. We evaluated the behavior of the coronagraph on a variety of astrophysical targets: binary stars, circumstellar disks, and active galactic nuclei. The performance of the coronagraph is in agreement with our expectations based on numerical simulations. The phase mask provides a stellar peak attenuation of a factor of about 10 on average (for long exposure), and its performance is limited only by the phase residuals (mainly low-order aberrations) that are left uncorrected by the adaptive optics system.

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