Fundamental gain in high-contrast imaging with the large binocular telescope interferometer

Fabien Patru, Simone Esposito, Alfio Puglisi, Armando Riccardi, Enrico Pinna, Carmelo Arcidiacono, John Hill, Philip M Hinz

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

2 Scopus citations


Numerical simulations for the Large Binocular Telescope Interferometer have shown a fundamental gain in contrast when using two 8m adaptive optics telescopes instead of one, assuming a high Strehl and a cophasing mode. The global gain is improved by a factor 2 in contrast by using the long exposures and by a factor of 10 in contrast by using the short exposures. Indeed, fringes are still present in the short exposure, contrary to the long exposure where the fringes are blurred. Thus, there is some gain in grouping some short exposures with high gain G. This makes the LBTI well suitable for the Angular Differential Imaging technique. A planet will be alternatively located in the dark fringes (G ≈ 10 to 100) and/or in the dark rings (G ≈ 4 to 20). A rotation of 15° is sufficient to pass through at least one gain zone. The LBTI can provide in the visible wavelengths not only high angular resolution (≈ 6:5mas at 750nm) and high sensitivity (by a factor 4), but also a gain in contrast (by a factor 10 to 100) compared to the stand-Alone adaptive optics used on each LBT aperture.

Original languageEnglish (US)
Title of host publicationOptical and Infrared Interferometry and Imaging V
ISBN (Electronic)9781510601932
StatePublished - 2016
Externally publishedYes
EventOptical and Infrared Interferometry and Imaging V - Edinburgh, United Kingdom
Duration: Jun 27 2016Jul 1 2016


OtherOptical and Infrared Interferometry and Imaging V
Country/TerritoryUnited Kingdom


  • Adaptive optic
  • Dynamic range
  • High contrast imaging angular differential imaging
  • Interferometry
  • Large Binocular Telescope Interferometer
  • Point spread function

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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