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Phase referencing in optical interferometry
Filho, Mercedes E; Garcia, Paulo; Duvert, Gilles et al.
2008In Schöller, Markus; Danchi, William; Delplancke, Françoise (Eds.) Optical and Infrared Interferometry
 

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Keywords :
Interferometry
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Filho, Mercedes E;  Ctr. de Astrofisica, Univ. do Porto (Portugal)
Garcia, Paulo;  Ctr. de Astrofisica, Univ. do Porto (Portugal) and Univ. do Porto (Portugal)
Duvert, Gilles;  Lab. d'Astrophysique, Observatoire de Grenoble (France)
Duchene, Gaspard;  Univ. of California, Berkeley (United States)
Thiebaut, Eric;  Observatoire de Lyon (France)
Young, John;  Cavendish Lab. (United Kingdom)
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Berger, Jean-Phillipe;  Univ. Joseph Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Beckert, Thomas;  Max-Planck Institute for Radioastronomy (Germany)
Hoenig, Sebastian;  Max-Planck Institute for Radioastronomy (Germany)
Schertl, Dieter;  Max-Planck Institute for Radioastronomy (Germany)
Weigelt, Gerd;  Max-Planck Institute for Radioastronomy (Germany)
Testi, Leonardo;  INAF, Osservatorio di Astrofisica di Arcetri (Italy)
Tatuli, Eric;  INAF, Osservatorio di Astrofisica di Arcetri (Italy)
Borkowski, Virginie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Aringer, Bernard;  Institute of Astrophysics, Univ. of Wien (Austria)
Hron, Joseph;  Institute of Astrophysics, Univ. of Wien (Austria)
Lebzelter, Thomas;  Institute of Astrophysics, Univ. of Wien (Austria)
Chiavassa, Andrea;  Astrophysique du Languedoc (France)
Corradi, Romano;  Astrophysique du Languedoc (France)
Harries, Tim;  Univ. of Exeter (United Kingdom)
More authors (13 more) Less
Language :
English
Title :
Phase referencing in optical interferometry
Publication date :
01 July 2008
Event name :
Space Telescopes and Instrumentation 2008: Optical and Infrared Interferometry
Event organizer :
SPIE
Event place :
Marseille, France
Event date :
23/06/2008 - 28/06/2008
Audience :
International
Main work title :
Optical and Infrared Interferometry
Editor :
Schöller, Markus
Danchi, William
Delplancke, Françoise
Publisher :
SPIE, Bellingham, United States - Washington
Collection name :
Proceedings of the SPIE, volume 7013
Pages :
1F.1-1F.12
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