Using the vector vortex coronagraph in the ExAO regime at Palomar: lessons learned

Details Using the vector vortex coronagraph in the ExAO regime at Palomar: lessons learned Using the vector vortex coronagraph in the ExAO regime at Palomar: lessons learned

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..64m&link_type=abstract

Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -

Physics

Scientific paper

We have been using the vector vortex coronagraph intensively on sky behind the 1.5-meter well-corrected subaperture on the 5-m Hale telescope at the Palomar observatory. This configuration allowed us to experiment the use of this small inner working angle, high throughput, clear and symmetric off-axis discovery space coronagraph in the ExAO regime. We will discuss the system level issues we had to tackle to make the most of this instrumental setup: low-frequency and high frequency pointing stabilization, focus removal, non-common path wavefront errors calibrations using the modified Gerchberg-Saxton phase retrieval technique, synchronized observing strategy. Without the availability of differential imaging capabilities such as angular or spectral differential imaging, we had to rely on the well-proven reference star subtraction. While not ideal, this method will be the only way to get to close separations since both ADI and SDI fail at very small angles. Fast and reproducible AO target acquisition allowed us to implement an efficient target-reference nodding method which is the key to achieving a high degree of correlation in the quasi-static speckle pattern required by smart data processing methods such as the locally optimized combination of images (LOCI).

Affiliated with

Also associated with

No associations

Rating

Using the vector vortex coronagraph in the ExAO regime at Palomar: lessons learned does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Using the vector vortex coronagraph in the ExAO regime at Palomar: lessons learned, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Using the vector vortex coronagraph in the ExAO regime at Palomar: lessons learned will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1234868