L'-band AGPM vector vortex coronagraph's first light on LBTI/LMIRCam

D. Defrère, O. Absil, P. Hinz, J. Kuhn, D. Mawet, B. Mennesson, A. Skemer, K. Wallace, V. Bailey, E. Downey, C. Delacroix, O. Durney, P. Forsberg, C. Gomez, S. Habraken, W. F. Hoffmann, M. Karlsson, M. Kenworthy, J. Leisenring, M. MontoyaL. Pueyo, M. Skrutskie, J. Surdej

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Scopus citations


We present the first observations obtained with the L'-band AGPM vortex coronagraph recently installed on LBTI/LMIRCam. The AGPM (Annular Groove Phase Mask) is a vector vortex coronagraph made from diamond subwavelength gratings. It is designed to improve the sensitivity and dynamic range of high-resolution imaging at very small inner working angles, down to 0.09 arcseconds in the case of LBTI/LMIRCam in the L' band. During the first hours on sky, we observed the young A5V star HR8799 with the goal to demonstrate the AGPM performance and assess its relevance for the ongoing LBTI planet survey (LEECH). Preliminary analyses of the data reveal the four known planets clearly at high SNR and provide unprecedented sensitivity limits in the inner planetary system (down to the diffraction limit of 0.09 arcseconds).

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems IV
EditorsJean-Pierre Veran, Enrico Marchetti, Laird M. Close
ISBN (Electronic)9780819496164
StatePublished - 2014
EventAdaptive Optics Systems IV - Montreal, Canada
Duration: Jun 22 2014Jun 27 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherAdaptive Optics Systems IV


  • Adaptive Optics
  • HR8799
  • LBT
  • coronagraphy
  • vortex phase mask

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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