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Proceedings Article

Phase referencing in optical interferometry

[+] Author Affiliations
Mercedes E. Filho

Ctr. de Astrofisica, Univ. do Porto (Portugal)

Paulo Garcia

Ctr. de Astrofisica, Univ. do Porto (Portugal) and Univ. do Porto (Portugal)

Gilles Duvert

Lab. d'Astrophysique, Observatoire de Grenoble (France)

Gaspard Duchene

Univ. of California, Berkeley (United States)

Eric Thiebaut

Observatoire de Lyon (France)

John Young

Cavendish Lab. (United Kingdom)

Olivier Absil, Jean-Phillipe Berger

Univ. Joseph Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)

Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt

Max-Planck Institute for Radioastronomy (Germany)

Leonardo Testi, Eric Tatuli

INAF, Osservatorio di Astrofisica di Arcetri (Italy)

Virginie Borkowski, Micha"l de Becker, Jean Surdej

Institute of Astrophysics and Geophysics (Belgium)

Bernard Aringer, Joseph Hron, Thomas Lebzelter

Institute of Astrophysics, Univ. of Wien (Austria)

Andrea Chiavassa, Romano Corradi

Astrophysique du Languedoc (France)

Tim Harries

Univ. of Exeter (United Kingdom)

Proc. SPIE 7013, Optical and Infrared Interferometry, 70131F (July 14, 2008); doi:10.1117/12.787908
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From Conference Volume 7013

  • Optical and Infrared Interferometry
  • Marseille, France | June 23, 2008

abstract

One of the aims of next generation optical interferometric instrumentation is to be able to make use of information contained in the visibility phase to construct high dynamic range images. Radio and optical interferometry are at the two extremes of phase corruption by the atmosphere. While in radio it is possible to obtain calibrated phases for the science objects, in the optical this is currently not possible. Instead, optical interferometry has relied on closure phase techniques to produce images. Such techniques allow only to achieve modest dynamic ranges. However, with high contrast objects, for faint targets or when structure detail is needed, phase referencing techniques as used in radio interferometry, should theoretically achieve higher dynamic ranges for the same number of telescopes. Our approach is not to provide evidence either for or against the hypothesis that phase referenced imaging gives better dynamic range than closure phase imaging. Instead we wish to explore the potential of this technique for future optical interferometry and also because image reconstruction in the optical using phase referencing techniques has only been performed with limited success. We have generated simulated, noisy, complex visibility data, analogous to the signal produced in radio interferometers, using the VLTI as a template. We proceeded with image reconstruction using the radio image reconstruction algorithms contained in aips imagr (clean algorithm). Our results show that image reconstruction is successful in most of our science cases, yielding images with a 4 milliarcsecond resolution in K band. We have also investigated the number of target candidates for optical phase referencing. Using the 2MASS point source catalog, we show that there are several hundred objects with phase reference sources less than 30 arcseconds away, allowing to apply this technique.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Mercedes E. Filho ; Paulo Garcia ; Gilles Duvert ; Gaspard Duchene ; Eric Thiebaut, et al.
"Phase referencing in optical interferometry", Proc. SPIE 7013, Optical and Infrared Interferometry, 70131F (July 14, 2008); doi:10.1117/12.787908; http://dx.doi.org/10.1117/12.787908


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