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1 results

  • Adaptive Mask coronagraph

  • P. Bourget, R. Vieira Martins, F. Colas, P. Assus, A. Irbah
  • Journal:
    Proceedings of the International Astronomical Union / Volume 1 / Issue C200 / October 2005
    Published online by Cambridge University Press:
    02 May 2006, pp. 461-466
    Print publication:
    October 2005
    • Article
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  • In this paper, the new coronagraph that will be mounted at the Pic du Midi Observatory (IMCCE - T1m telescope) is presented. To optimize the occulting process of a Lyot coronagraph, a compressed mercury (Hg) drop is used as an occulting disk and its size control offers an adaptation to the seeing conditions or to the Airy diameter fraction needed. In addition to the Hg-mask, a variation on the theme is proposed by a diameter and wavelength adaptive phase mask made of a gas bubble in immersion oil between two optical windows. The instrument concept offers a good versatility to test other mask type and pupil apodization techniques.