Zobrazeno 1 - 10
of 243
pro vyhledávání: '"Thiébaut, Eric"'
We tackle covariance estimation in low-sample scenarios, employing a structured covariance matrix with shrinkage methods. These involve convexly combining a low-bias/high-variance empirical estimate with a biased regularization estimator, striking a
Externí odkaz:
http://arxiv.org/abs/2403.07104
Publikováno v:
A&A 679, A38 (2023)
Exoplanet detections and characterizations via direct imaging require high contrast and high angular resolution. These requirements typically require (i) cutting-edge instrumental facilities, (ii) optimized differential imaging to introduce a diversi
Externí odkaz:
http://arxiv.org/abs/2309.08679
Publikováno v:
Astronomy and Astrophysics - A&A, 2023, 674, pp.A112
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 close to the diffraction limit at the core of their point spread function
Externí odkaz:
http://arxiv.org/abs/2306.10803
Autor:
Thé, Samuel, Thiébaut, Éric, Denis, Loïc, Wanner, Thibault, Thiébaut, Rémi, Langlois, Maud, Soulez, Ferréol
Publikováno v:
A&A 678, A77 (2023)
High-contrast long-slit spectrographs can be used to characterize exoplanets. High-contrast long-slit spectroscopic data are however corrupted by stellar leakages which largely dominate other signals and make the process of extracting the companion s
Externí odkaz:
http://arxiv.org/abs/2306.03467
Autor:
Berdeu, Anthony, Tallon, Michel, Thiébaut, Éric, Alagao, Mary Angelie, Sukpholtham, Sitthichat, Langlois, Maud, Kawinkij, Adithep, Kongkaew, Puttiwat
Publikováno v:
Adaptive Optics Systems VIII, Jul 2022, Montr{\'e}al, Canada. pp.121850K
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 the AO loop algorithms. It was first used to validate a novel analytic
Externí odkaz:
http://arxiv.org/abs/2301.03478
Autor:
Berdeu, Anthony, Sukpholtham, Sitthichat, Kongkaew, Puttiwat, Kawinkij, Adithep, Ridsdill-Smith, Matthew, Tallon, Michel, Thiébaut, Éric, Langlois, Maud, Alagao, Mary Angelie
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 Observatory. We present in this work the development of a bench to cha
Externí odkaz:
http://arxiv.org/abs/2212.13818
Autor:
Soulez, Ferréol, Bourgès, Laurent, Kaszczyc, Antoine, Mella, Guillaume, Pratoussy, Martin, Duvert, Gilles, Kluska, Jacques, Thiébaut, Eric, Young, John
Publikováno v:
Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121831H (26 August 2022)
In interferometry, the quality of the reconstructed image depends on the algorithm used and its parameters, and users often need to compare the results of several algorithms to disentangle artifacts from actual features of the astrophysical object. S
Externí odkaz:
http://arxiv.org/abs/2209.07846
Angular and spectral differential imaging is an observational technique of choice to investigate the immediate vicinity of stars. The relative angular motion and spectral scaling between on-axis and off-axis sources are exploited by post-processing t
Externí odkaz:
http://arxiv.org/abs/2109.12644
Publikováno v:
In Science of the Total Environment 10 October 2024 946
Autor:
Chauvel, Nathan, Raoux, Aurore, Weill, Pierre, Dezilleau, Laurent, Méar, Yann, Murat, Anne, Poizot, Emmanuel, Foveau, Aurélie, Desroy, Nicolas, Thiébaut, Éric, Dauvin, Jean-Claude, Pezy, Jean-Philippe
Publikováno v:
In Marine Pollution Bulletin March 2024 200