S.N.R. analysis of super-resolving chromatic position difference techniques in astronomy

Lund, Glenn; Aime, Claude

doi:10.1016/0030-4018(88)90308-2

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…This feature was first presented by Beckers & Hege (1982) for differential speckle interferometry and has later been developed by Petrov, Roddier & Aime (1986), Petrov (1989) and the GI2T team. Therefore, differential phase is a close parent of the colour‐differential astrometry method (also called sometimes spectroastrometry), based on the displacement with wavelength of the photocentre of a long exposure image at a telescope focus (Sorokin & Tokovinin 1985; Lund & Aime 1988; Takami, Bailey & Chrysostomou 2003). For diffraction‐limited images, the performance of these two techniques is proportional to the square root of the number of collected photons [i.e.…”

Section: Introductionmentioning

confidence: 99%

Colour-differential interferometry for the observation of extrasolar planets

Vannier

Petrov

López

et al. 2006

Monthly Notices of the Royal Astronomical Society

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International audienceWe present the high angular resolution technique of colour-differential interferometry for direct detection of extrasolar giant planets (EGPs). The measurement of differential phase with long-baseline ground-based interferometers in the near-infrared could allow the observation of several hot giant extrasolar planets in tight orbit around the nearby stars, and thus yield their low- or mid-resolution spectroscopy, complete orbital data set and mass. Estimates of potentially achievable signal-to-noise ratios are presented for a number of planets already discovered by indirect methods. The limits from the instrumental and atmospheric instability are discussed, and a subsequent observational strategy is proposed

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Section: Introductionmentioning

confidence: 99%

Colour-differential interferometry for the observation of extrasolar planets

Vannier

Petrov

López

et al. 2006

Monthly Notices of the Royal Astronomical Society

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“…Therefore, for most of the astronomical candidates for which spectral features are tentatively explained by large scale spatial features, e(A) yields the position angle and angular scale of the source and constrains its modelization. Several authors (Petrov et al 1986, Lund & Aime 1988, Chelli 1989 have analysed the influence of photon and speckle noise on DI SNR, concluding that submilliarcsecond resolution can be achieved with existing large telescopes for magnitudes up to about eight.…”

Section: Introductionmentioning

confidence: 99%

Differential Speckle Interferometry Applied to Double Stars

Petrov

Lagarde

1992

International Astronomical Union Colloquium

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Differential Interferometry (DI) is the application of high angular resolution interferometric techniques to objects observed simultaneously at different wavelengths. When applied to unresolved double stars it makes it possible to measure the variation of the object photocenter with wavelength, which yields angular and spectral information well beyond the classical resolution limits. Signal–to–noise ratio analysis shows that, if DI experiments are limited by photon and speckle noise, the technique can be applied to a large number of double systems for the measurement of vectorial angular separations and of radial-velocity differences. With 4-m telescopes, there are a few tens of binary systems for which DI should permit the resolution and the measurement of the position angle of the rotation axis of at least one of the components. A preliminary experiment permitted a high SNR resolution of the double star Capella with a 1.52-m telescope and showed the current limitations of DI performances resulting from an imperfect correction of detector geometrical distortions.

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Differential Interferometry

Petrov

1989

Diffraction-Limited Imaging With Very Large Telescopes

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S.N.R. analysis of super-resolving chromatic position difference techniques in astronomy

Cited by 3 publications

References 2 publications

Colour-differential interferometry for the observation of extrasolar planets

Colour-differential interferometry for the observation of extrasolar planets

Differential Speckle Interferometry Applied to Double Stars

Differential Interferometry

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