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Paper Abstract

The VLTI Spectro Imager project aims to perform imaging with a temporal resolution of 1 night and with a maximum angular resolution of 1 milliarcsecond, making best use of the Very Large Telescope Interferometer capabilities. To fulfill the scientific goals (see Garcia et. al.), the system requirements are: a) combining 4 to 6 beams; b) working in spectral bands J, H and K; c) spectral resolution from R= 100 to 12000; and d) internal fringe tracking on-axis, or off-axis when associated to the PRIMA dual-beam facility. The concept of VSI consists on 6 sub-systems: a common path distributing the light between the fringe tracker and the scientific instrument, the fringe tracker ensuring the co-phasing of the array, the scientific instrument delivering the interferometric observables and a calibration tool providing sources for internal alignment and interferometric calibrations. The two remaining sub-systems are the control system and the observation support software dedicated to the reduction of the interferometric data. This paper presents the global concept of VSI science path including the common path, the scientific instrument and the calibration tool. The scientific combination using a set of integrated optics multi-way beam combiners to provide high-stability visibility and closure phase measurements are also described. Finally we will address the performance budget of the global VSI instrument. The fringe tracker and scientific spectrograph will be shortly described.

Paper Details

Date Published: 28 July 2008
PDF: 12 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70132Y (28 July 2008); doi: 10.1117/12.789154
Show Author Affiliations
L. Jocou, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
J. P. Berger, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
F. Malbet, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
P. Kern, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
U. Beckmann, Max-Planck-Institute for Radioastronomy (Germany)
D. Lorenzetti, INAF, Osservatorio di Astrofisica di Roma (Italy)
L. Corcione, INAF, Osservatorio Astrofisico di Torino (Italy)
G. Li Causi, INAF, Osservatorio di Astrofisica di Roma (Italy)
D. Buscher, Cavendish Lab., Univ. of Cambridge (United Kingdom)
J. Young, Cavendish Lab., Univ. of Cambridge (United Kingdom)
M. Gai, INAF/Osservatorio Astrofisico di Torino (Italy)
G. Weigelt, Max-Planck-Institute for Radioastronomy (Germany)
G. Zins, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
G. Duvert, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
K. Perraut, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
P. Labeye, CEA/LETI (France)
O. Absil, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
P. Garcia, Ctr. for Astrophysics, Univ. of Porto (Portugal)
D. Loreggia, INAF, Osservatorio di Astrofisica di Roma (Italy)
J. Lima, Univ. de Lisboa (Portugal)
J. Rebordao, Instituto Nacional de Engenharia, Tecnologia e Inovação (Portugal)
S. Ligori, INAF, Osservatorio Astrofisico di Torino (Italy)
A. Amorim, Univ. de Lisboa (Portugal)
P. Rabou, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
J. B. Le Bouquin, European Southern Observatory (Chile)
C. Haniff, Cavendish Lab., Univ. of Cambridge (United Kingdom)
E. Le Coarer, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
P. Feautrier, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
G. Duchene, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
M. Benisty, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
A. Chelli, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
E. Herwats, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Institut d'Astrophysique et de Géophysique (Belgium)
A. Delboulbé, Univ. J. Fourier, CNRS, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)


Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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