Ms. Emilie Herwats Profile

Emilie Herwats

at Lab d'Astrophysique de l'Observatoire de Grenoble

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Author

Publications (5)

Proceedings Article | 28 July 2008 Paper

System overview of the VLTI Spectro-Imager

L. Jocou, J. P. Berger, F. Malbet, P. Kern, U. Beckmann, D. Lorenzetti, L. Corcione, G. Li Causi, D. Buscher, J. Young, M. Gai, G. Weigelt, G. Zins, G. Duvert, K. Perraut, P. Labeye, O. Absil, P. Garcia, D. Loreggia, J. Lima, J. Rebordao, S. Ligori, A. Amorim, P. Rabou, J. B. Le Bouquin, C. Haniff, E. Le Coarer, P. Feautrier, G. Duchene, M. Benisty, A. Chelli, E. Herwats, A. Delboulbé

Proceedings Volume 7013, 70132Y (2008) https://doi.org/10.1117/12.789154

KEYWORDS: Optical fibers, Mirrors, Sensors, Beam splitters, Interferometry, Spectrographs, Fourier transforms, Calibration, Information operations, Computed tomography

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Proceedings Article | 28 July 2008 Paper

VSI: the VLTI spectro-imager

F. Malbet, D. Buscher, G. Weigelt, P. Garcia, M. Gai, D. Lorenzetti, J. Surdej, J. Hron, R. Neuhäuser, P. Kern, L. Jocou, J.-P. Berger, O. Absil, U. Beckmann, L. Corcione, G. Duvert, M. Filho, P. Labeye, E. Le Coarer, G. Li Causi, J. Lima, K. Perraut, E. Tatulli, E. Thiébaut, J. Young, G. Zins, A. Amorim, B. Aringer, T. Beckert, M. Benisty, X. Bonfils, A. Cabral, A. Chelli, O. Chesneau, A. Chiavassa, R. Corradi, M. De Becker, A. Delboulbé, G. Duchêne, T. Forveille, C. Haniff, E. Herwats, K.-H. Hofmann, J.-B. Le Bouquin, S. Ligori, D. Loreggia, A. Marconi, A. Moitinho, B. Nisini, P.-O. Petrucci, J. Rebordao, R. Speziali, L. Testi, F. Vitali

Proceedings Volume 7013, 701329 (2008) https://doi.org/10.1117/12.789710

KEYWORDS: Telescopes, Stars, Spectral resolution, Spatial resolution, Interferometry, Integrated optics, Space telescopes, Visibility, Image restoration, Signal to noise ratio

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The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-infrared images at angular resolutions down to 1.1 milliarcsecond and spectral resolutions up to R = 12000. Targets as faint as K = 13 will be imaged without requiring a brighter nearby reference object; fainter targets can be accessed if a suitable reference is available. The unique combination of high-dynamic-range imaging at high angular resolution and high spectral resolution enables a scientific program which serves a broad user community and at the same time provides the opportunity for breakthroughs in many areas of astrophysics. The high level specifications of the instrument are derived from a detailed science case based on the capability to obtain, for the first time, milliarcsecond-resolution images of a wide range of targets including: probing the initial conditions for planet formation in the AU-scale environments of young stars; imaging convective cells and other phenomena on the surfaces of stars; mapping the chemical and physical environments of evolved stars, stellar remnants, and stellar winds; and disentangling the central regions of active galactic nuclei and supermassive black holes. VSI will provide these new capabilities using technologies which have been extensively tested in the past and VSI requires little in terms of new infrastructure on the VLTI. At the same time, VSI will be able to make maximum use of new infrastructure as it becomes available; for example, by combining 4, 6 and eventually 8 telescopes, enabling rapid imaging through the measurement of up to 28 visibilities in every wavelength channel within a few minutes. The current studies are focused on a 4-telescope version with an upgrade to a 6-telescope one. The instrument contains its own fringe tracker and tip-tilt control in order to reduce the constraints on the VLTI infrastructure and maximize the scientific return.

Proceedings Article | 28 July 2008 Paper

Polar-interferometry: what can be learnt from the IOTA/IONIC experiment

Jean-Baptiste Le Bouquin, Karine Rousselet-Perraut, Jean-Philippe Berger, Emilie Herwats, Myriam Benisty, Olivier Absil, Denis Defrere, John Monnier, Wesley Traub

Proceedings Volume 7013, 70130F (2008) https://doi.org/10.1117/12.786377

KEYWORDS: Polarization, Mirrors, Calibration, Polarimetry, Telescopes, Visibility, Interferometry, Sensors, Integrated optics, Polarizers

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Proceedings Article | 28 July 2008 Paper

Characterization of integrated optics components for the second generation of VLTI instruments

S. Lacour, L. Jocou, T. Moulin, P. Labeye, M. Benisty, J.-P. Berger, A. Delboulbé, X. Haubois, E. Herwats, P. Kern, F. Malbet, K. Rousselet-Perraut, G. Perrin

Proceedings Volume 7013, 701316 (2008) https://doi.org/10.1117/12.789795

KEYWORDS: Integrated optics, Telescopes, K band, Semiconducting wafers, Waveguides, Phase shifts, Information operations, Modulation, Photomasks, Single mode fibers

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Proceedings Article | 27 June 2006 Paper

VSI: a milli-arcsec spectro-imager for the VLTI

F. Malbet, P. Kern, J.-P. Berger, L. Jocou, P. Garcia, D. Buscher, K. Rousselet-Perraut, G. Weigelt, M. Gai, J. Surdej, J. Hron, R. Neuhäuser, E. Le Coarer, P. Labeye, J. Le Bouquin, M. Benisty, E. Herwats

Proceedings Volume 6268, 62680Y (2006) https://doi.org/10.1117/12.673098

KEYWORDS: Telescopes, Stars, Information operations, Integrated optics, Spectral resolution, Spectrographs, Imaging spectroscopy, Sensors, Adaptive optics, Phase measurement

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