Phase closure image reconstruction for future VLTI instrumentation

Mercedes E. Filho; Stephanie Renard; Paulo Garcia; Gilles Duvert; Eric Thiebaut; John Young; Olivier Absil; Jean-Phillipe Berger; Thomas Beckert; Sebastian Hoenig; Dieter Schertl; Gerd Weigelt; Leonardo Testi; Eric Tatuli; Virginie Borkowski; Michaël de Becker; Jean Surdej; Bernard Aringer; Joseph Hron; Thomas Lebzelter; Andrea Chiavassa; Romano Corradi; Tim Harries

doi:10.1117/12.787877

28 July 2008 Phase closure image reconstruction for future VLTI instrumentation

Mercedes E. Filho, Stephanie Renard, Paulo Garcia, Gilles Duvert, Eric Thiebaut, John Young, Olivier Absil, Jean-Phillipe Berger, Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt, Leonardo Testi, Eric Tatuli, Virginie Borkowski, Michaël de Becker, Jean Surdej, Bernard Aringer, Joseph Hron, Thomas Lebzelter, Andrea Chiavassa, Romano Corradi, Tim Harries

Author Affiliations +

Proceedings Volume 7013, Optical and Infrared Interferometry; 70133Z (2008) https://doi.org/10.1117/12.787877
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

Classically, optical and near-infrared interferometry have relied on closure phase techniques to produce images. Such techniques allow us to achieve modest dynamic ranges. In order to test the feasibility of next generation optical interferometers in the context of the VLTI-spectro-imager (VSI), we have embarked on a study of image reconstruction and analysis. Our main aim was to test the influence of the number of telescopes, observing nights and distribution of the visibility points on the quality of the reconstructed images. Our results show that observations using six Auxiliary Telescopes (ATs) during one complete night yield the best results in general and is critical in most science cases; the number of telescopes is the determining factor in the image reconstruction outcome. In terms of imaging capabilities, an optical, six telescope VLTI-type configuration and ~200 meter baseline will achieve 4 mas spatial resolution, which is comparable to ALMA and almost 50 times better than JWST will achieve at 2.2 microns. Our results show that such an instrument will be capable of imaging, with unprecedented detail, a plethora of sources, ranging from complex stellar surfaces to microlensing events.

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Mercedes E. Filho, Stephanie Renard, Paulo Garcia, Gilles Duvert, Eric Thiebaut, John Young, Olivier Absil, Jean-Phillipe Berger, Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt, Leonardo Testi, Eric Tatuli, Virginie Borkowski, Michaël de Becker, Jean Surdej, Bernard Aringer, Joseph Hron, Thomas Lebzelter, Andrea Chiavassa, Romano Corradi, and Tim Harries "Phase closure image reconstruction for future VLTI instrumentation", Proc. SPIE 7013, Optical and Infrared Interferometry, 70133Z (28 July 2008); https://doi.org/10.1117/12.787877

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