Physics – Optics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..74a&link_type=abstract
Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -
Physics
Optics
Scientific paper
Recent observational results have demonstrated the potential of the L band for the detection of extrasolar planets by direct imaging on large ground-based telescopes. The achievable inner working angle is however currently limited by the lack of optimized coronagraphic devices for this specific wavelength, which in combination with the relatively poor angular resolution in L band leads to a limited discovery space. In this talk, we present the science case for the implementation of an L-band vector vortex coronagraph inside CONICA, the infrared camera behind NAOS, the current adaptive optics system at the VLT. We present the design of an L-band Annular Groove Phase Mask Coronagraph made out of subwavelength gratings in diamond for that purpose. This coronagraphic mask provides a clear 360° discovery space down to lambda/D. We discuss the expected performance of such a combination, which will provide unique benefits (next generation ExAO systems won't provide L-band capabilities) and pave the way towards equivalent instruments on the ELT (e.g., METIS).
Absil Oliver
Delacroix Christian
Habraken Serge
Hanot Ch.
Karlsson Maths
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