BRESSON , Yves

Pupil-remapping is a new high-dynamic range imaging technique that has recently demonstrated feasibility on sky. The current prototypes present however deceiving limiting magnitude, restricting the current use to the brightest stars in the sky. We propose to combine pupil-remapping with spatio-spectral encoding, a technique first applied to the...

Pupil-remapping is a new high-dynamic range imaging technique that has recently demonstrated feasibility on sky. The current prototypes present however deceiving limiting magnitude, restricting the current use to the brightest stars in the sky. We propose to combine pupil-remapping with spatio-spectral encoding, a technique first applied to the...

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International audience

While doing optical study in an instrument similar to the interferometers dedicated to the Very Large Telescope (VLT), we have to take care of the pupil and focus conjugations. Modules with artificial sources are designed to simulate the stellar beams, in terms of collimation and pupil location. They constitute alignment and calibration tools....

International audience

International audience

We report in this note the discovery of a close double star. The binarity of the bright star SAO 12917 is determined from visible speckle interferometry with the Bernard Lyot telescope.

This paper describes instrumentation used to adapt the Dunn Solar Telescope (DST) located on Sacramento Peak in Sunspot, NM for observations using the Doppler Spectro Imager (DSI). The DSI is based on a Mach-Zehnder interferometer and measures the Doppler shift of solar lines to allow the study of atmospheric dynamics of giant planets and the...

We report in this note the discovery of a close double star. The binarity of the bright star SAO 12917 is determined from visible speckle interferometry with the Bernard Lyot telescope.

International audience

The measurements of radial velocity fields on planets with a Doppler Spectro-Imager allow the study of atmospheric dynamics of giant planets and the detection of their acoustic oscillations. The frequencies of these oscillations lead to the determination of the internal structure by asteroseismology. A new imaging tachometer, based on a...

The AOC (Adaptive Optics at Calern) project is an adaptive optics bench being installed on one of the two 1-m telescopes of C2PU (Centre Pédagogique Planète Univers), situated in the Calern observatory, Observatoire de la Côte d'Azur, near Nice (France). AOC is installed at the Coudé focus of the telescope, and aims at working in the visible...

This paper presents a study of the atmospheric refraction and its effect on the light coupling efficiency in an instrument using single-mode optical fibers. We show the analytical approach which allowed us to assess the need to correct the refraction in J- and H-bands while observing with an 8-m Unit Telescope. We then developed numerical...