166 citations · 475 across the 16 of their papers we have counts for
16 papers
Optimization of adaptive optics correction during observations: Algorithms and system parameters identification in closed-loop
Clémentine Béchet, Michel Tallon, Éric Thiébaut
The adaptive optics (AO) on the European Extremely Large Telescope, as well as earlier pathfinders like the Adaptive Optics Facility, at the Very Large Telescope in 2014, will no l…
Closing the loop as an inverse problem: the real-time control of THEMIS adaptive optics
Éric Thiébaut, Michel Tallon, Isabelle Tallon-Bosc +4
We have taken advantage of the implementation of an adaptive optics system on the Themis solar telescope to implement innovative strategies based on an inverse problem formulation…
Beyond FRiM, ASAP: a family of sparse approximation for covariance matrices and preconditioners
Éric Thiébaut, Michel Tallon, Samuel Thé +1
The FRiM fractal operator belongs to a family of operators, called ASAP, defined by an ordered selection of nearest neighbors. This generalization provides means to improve upon th…
Analytical modelling of adaptive optics systems: Role of the influence function
Anthony Berdeu, Michel Tallon, Éric Thiébaut +1
Context. Adaptive optics (AO) is now a tool commonly deployed in astronomy. The real time correction of the atmospheric turbulence that AO enables allows telescopes to perform clos…
Inverse problem approach in Extreme Adaptive Optics: analytical model of the fitting error and lowering of the aliasing
Anthony Berdeu, Michel Tallon, Éric Thiébaut +5
We present the results obtained with an end-to-end simulator of an Extreme Adaptive Optics (XAO) system control loop. It is used to predict its on-sky performances and to optimise…
Adaptive Optics system of the Evanescent Wave Coronagraph (EvWaCo): optimised phase plate and DM characterisation
Anthony Berdeu, Sitthichat Sukpholtham, Puttiwat Kongkaew +6
The Evanescent Wave Coronagraph (EvWaCo) is an achromatic coronagraph mask with adjustable size over the spectral domain [600nm, 900nm] that will be installed at the Thai National…
Deep Contrast and Companion Detection Using the EvWaCo Testbed Equipped with an Achromatic Focal Plane Mask and an Adjustable Inner Working Angle
M. A. Alagao, A. Kawinkij, C. Buisset +21
The evanescent wave coronagraph uses the principle of frustrated total internal reflection (FTIR) to suppress the light coming from the star and study its close environment. Its fo…
The wavefront sensing making-of for THEMIS solar telescope
Michel Tallon, Éric Thiébaut, Maud Langlois +5
An adaptive optics system with a single deformable mirror is being implemented on the THEMIS 90cm solar telescope. This system is designed to operate in the visible and is required…
CHARA Array adaptive optics: complex operational software and performance
Narsireddy Anugu, Theo ten Brummelaar, Nils H. Turner +18
The CHARA Array is the longest baseline optical interferometer in the world. Operated with natural seeing, it has delivered landmark sub-milliarcsecond results in the areas of stel…
A family portrait of disk inner rims around Herbig Ae/Be stars: Hunting for warps, rings, self shadowing, and misalignments in the inner astronomical units
J. Kluska, J. -P. Berger, F. Malbet +25
The innermost astronomical unit in protoplanetary disks is a key region for stellar and planet formation, as exoplanet searches have shown a large occurrence of close-in planets th…
SPHERE+: Imaging young Jupiters down to the snowline
A. Boccaletti, G. Chauvin, D. Mouillet +130
SPHERE (Beuzit et al,. 2019) has now been in operation at the VLT for more than 5 years, demonstrating a high level of performance. SPHERE has produced outstanding results using a…
Science cases for a visible interferometer
Philippe Stee, France Allard, Myriam Benisty +54
High spatial resolution is the key for the understanding various astrophysical phenomena. But even with the future E-ELT, single dish instruments are limited to a spatial resolutio…
Structure of Herbig AeBe disks at the milliarcsecond scale A statistical survey in the H band using PIONIER-VLTI
B. Lazareff, J. -P. Berger, J. Kluska +26
Context. It is now generally accepted that the near-infrared excess of Herbig AeBe stars originates in the dust of a circumstellar disk. Aims. The aims of this article are to infer…
Development of an ELT XAO testbed using a Mach-Zehnder wavefront sensor: calibration of the deformable mirror
Christian Delacroix, Maud Langlois, Magali Loupias +4
(abridged) Extreme adaptive optics (XAO) encounters severe difficulties to cope with the high speed (>1kHz), high accuracy and high order requirements for future extremely large te…
Fast minimum variance wavefront reconstruction for extremely large telescopes
Eric Thiebaut, Michel Tallon
We present a new algorithm, FRiM (FRactal Iterative Method), aiming at the reconstruction of the optical wavefront from measurements provided by a wavefront sensor. As our applicat…
Disk and wind interaction in the young stellar object MWC 297 spatially resolved with VLTI/AMBER
F. Malbet, M. Benisty, W. J. De Wit +15
The young stellar object MWC 297 has been observed with the VLT interferometer equipped with the AMBER instrument. MWC 297 has been spatially resolved in the continuum with a visib…