M. Langlois
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View article: Characterization of debris disks observed with SPHERE
Characterization of debris disks observed with SPHERE Open
Aims . This study aims to characterize debris disk targets observed with SPHERE across multiple programs, with the goal of identifying systematic trends in disk morphology, dust mass, and grain properties as a function of stellar parameter…
View article: Diffusion models for polarimetric reconstruction of circumstellar environments
Diffusion models for polarimetric reconstruction of circumstellar environments Open
In this paper, we propose an approach combining diffusion models and inverse problems for the reconstruction of circumstellar disk images. Our method builds upon the Rhapsodie framework for polarimetric imaging, substituting its classical …
View article: Joint statistical modeling and deep learning for exoplanet detection and characterization by direct imaging at high contrast
Joint statistical modeling and deep learning for exoplanet detection and characterization by direct imaging at high contrast Open
International audience
View article: Calibration and performances of the integrated Mach—Zehnder wavefront sensor for extreme adaptive optics
Calibration and performances of the integrated Mach—Zehnder wavefront sensor for extreme adaptive optics Open
Context . Direct imaging of circumstellar environments around nearby stars requires eXtreme Adaptive Optics (XAO) systems. These systems must integrate advanced wavefront sensors (WFSs) to reach a high Strehl ratio (SR) in the near-infrare…
View article: Small-ELF project: Performance of XAO, cophasing and dark hole coronography for high contrast exoplanet direct detection
Small-ELF project: Performance of XAO, cophasing and dark hole coronography for high contrast exoplanet direct detection Open
The Small ELF (sELF) project is a fixed pupil interferometer dedicated to high contrast having a 3.5 m telescope angular resolution and allowing direct “dark hole” coronagraphy. Such configuration requires special extreme adaptive optics (…
View article: The ExoLife Finder (ELF) telescope project — a cutting-edge hybrid interferometer telescope explicitly designed for the high-contrast direct detection of exoplanets.
The ExoLife Finder (ELF) telescope project — a cutting-edge hybrid interferometer telescope explicitly designed for the high-contrast direct detection of exoplanets. Open
The ExoLife Finder (ELF) is a groundbreaking ground-based facility that will transform exoplanet research through direct imaging and characterisation of terrestrial exoplanets. Our mission is to identify biomarkers within their atmospheres…
View article: Upgrading SPHERE with the second stage AO system SAXO+
Upgrading SPHERE with the second stage AO system SAXO+ Open
SAXO+ is a project to upgrade the SPHERE extreme Adaptive Optics instrument at the VLT to boost the current performances of detection and characterization of exoplanets and disks. The main science drivers are 1/ to access the bulk of the y…
View article: Deep learning for exoplanet detection and characterization by direct imaging at high contrast
Deep learning for exoplanet detection and characterization by direct imaging at high contrast Open
The detection of exoplanets, the characterization of their atmospheres, and the study of exoplanet formation mechanisms are major current challenges in astrophysics. High-contrast direct imaging (HCI) is one of the observational techniques…
View article: Exploration of the inner region of the system HD 142527
Exploration of the inner region of the system HD 142527 Open
HD 142527 is a well-studied Herbig Ae/Be star surrounded by a transitional disk with a large dust cavity, spiral structures, and a known accreting dwarf companion. Despite extensive observations, the system’s inner regions remain poorly un…
View article: Evidence for a sub-Jovian planet in the young TWA 7 disk
Evidence for a sub-Jovian planet in the young TWA 7 disk Open
Planets are thought to form from dust and gas in protoplanetary disks, with debris disks being the remnants of planet formation. Aged a few million up to a few billion years, debris disks have lost their primordial gas, and their dust is p…
View article: Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Evidence of planet–disk interaction in the 2MASSJ16120668-3010270 system
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Evidence of planet–disk interaction in the 2MASSJ16120668-3010270 system Open
Context . The multitude of different architectures found for evolved exoplanet systems are in all likelihood set during the initial planet-formation phase in the circumstellar disk. To understand this process, we have to study the earliest…
View article: A Prototype Atom Interferometer to Detect Dark Matter and Gravitational Waves
A Prototype Atom Interferometer to Detect Dark Matter and Gravitational Waves Open
The AION project has built a tabletop prototype of a single-photon long-baseline atom interferometer using the 87Sr clock transition - a type of quantum sensor designed to search for dark matter and gravitational waves. Our prototype detec…
View article: The SPHERE infrared survey for exoplanets (SHINE)
The SPHERE infrared survey for exoplanets (SHINE) Open
Context. Over the past decade, large surveys with state-of-the-art planet-finder instruments such as Spectro-Polarimetric High-contrast Exoplanet REsearch on board Very Large Telescope (SPHERE@VLT), coupled with coronagraphic devices and e…
View article: The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results
The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results Open
During the past decade, state-of-the-art planet-finder instruments like SPHERE@VLT, coupling coronagraphic devices and extreme adaptive optics systems, unveiled, thanks to large surveys, around 20 planetary mass companions at semi-major ax…
View article: Creating ground-based telescopes for imaging interferometry: SELF and ELF
Creating ground-based telescopes for imaging interferometry: SELF and ELF Open
View article: Population of giant planets around B stars from the first part of the BEAST survey
Population of giant planets around B stars from the first part of the BEAST survey Open
Context. Exoplanets form from circumstellar protoplanetary disks whose fundamental properties (notably their extent, composition, mass, temperature, and lifetime) depend on the host star properties, such as their mass and luminosity. B sta…
View article: REXPACO ASDI: joint unmixing and deconvolution of the circumstellar environment by angular and spectral differential imaging
REXPACO ASDI: joint unmixing and deconvolution of the circumstellar environment by angular and spectral differential imaging Open
Angular and spectral differential imaging is an observational technique of choice to investigate the immediate vicinity of stars. By leveraging the relative angular motion and spectral scaling between on-axis and off-axis sources, post-pro…
View article: Direct imaging and dynamical mass of a benchmark T-type brown dwarf companion to HD 167665
Direct imaging and dynamical mass of a benchmark T-type brown dwarf companion to HD 167665 Open
Context . A low-mass companion potentially in the brown dwarf mass regime was discovered on a ~12 yr orbit (~5.5 au) around HD 167665 using radial velocity (RV) monitoring. Joint RV–astrometry analyses confirmed that HD 167665B is a brown …
View article: Giant planets population around B stars from the first part of the BEAST survey
Giant planets population around B stars from the first part of the BEAST survey Open
Exoplanets form from circumstellar protoplanetary discs whose fundamental properties (notably their extent, composition, mass, temperature and lifetime) depend on the host star properties, such as their mass and luminosity. B-stars are amo…
View article: MODEL&CO: Exoplanet detection in angular differential imaging by learning across multiple observations
MODEL&CO: Exoplanet detection in angular differential imaging by learning across multiple observations Open
Direct imaging of exoplanets is particularly challenging due to the high contrast between the planet and the star luminosities, and their small angular separation. In addition to tailored instrumental facilities implementing adaptive optic…
View article: MODEL&CO: Exoplanet detection in angular differential imaging by learning across multiple observations
MODEL&CO: Exoplanet detection in angular differential imaging by learning across multiple observations Open
Direct imaging of exoplanets is particularly challenging due to the high contrast between the planet and the star luminosities, and their small angular separation. In addition to tailored instrumental facilities implementing adaptive optic…
View article: Upgrading SPHERE with the second stage AO system SAXO+: frequency-based data-driven controller for adaptive optics
Upgrading SPHERE with the second stage AO system SAXO+: frequency-based data-driven controller for adaptive optics Open
This study introduces a novel frequency-based data-driven controller for adaptive optics, using power spectral density for optimization while ensuring stability criteria. It addresses disturbance rejection, command amplitude constraints an…
View article: From Linear to Nonlinear Unfolded Condat-Vú Algorithm for Spectro-Polarimetric Hight-Constrast Image Recovery
From Linear to Nonlinear Unfolded Condat-Vú Algorithm for Spectro-Polarimetric Hight-Constrast Image Recovery Open
International audience
View article: HARMONI at ELT: project status and instrument overview
HARMONI at ELT: project status and instrument overview Open
International audience
View article: Numerical simulations for the SAXO+ upgrade: Performance analysis of the adaptive optics system
Numerical simulations for the SAXO+ upgrade: Performance analysis of the adaptive optics system Open
Context. SPHERE, operating at the VLT since 2014, is currently one of the high-contrast instruments with a higher performance. Its adaptive optics system, known as SAXO, will be upgraded to SAXO+, which features the addition of a second st…
View article: Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction
Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction Open
editorial reviewed
View article: Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction
Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction Open
SAXO+ is a planned enhancement of the existing SAXO, the VLT/ SPHERE adaptive optics system, deployed on ESO's Very Large Telescope. This upgrade is designed to significantly enhance the instrument's capacity to detect and analyze young Ju…
View article: Numerical simulations for the SAXO+ upgrade: Performance analysis of the adaptive optics system
Numerical simulations for the SAXO+ upgrade: Performance analysis of the adaptive optics system Open
SPHERE, operating at the VLT since 2014, is currently one of the high-contrast instruments with a higher performance. Its adaptive optics system, known as SAXO, will be upgraded to SAXO+, which features the addition of a second stage of ad…
View article: Upgrading SPHERE with the second-stage adaptive optics system SAXO+: conceptual design of the opto-mechanical module
Upgrading SPHERE with the second-stage adaptive optics system SAXO+: conceptual design of the opto-mechanical module Open
International audience
View article: Blind and robust reconstruction of adaptive optics point spread functions for asteroid deconvolution and moon detection
Blind and robust reconstruction of adaptive optics point spread functions for asteroid deconvolution and moon detection Open
Initially designed to detect and characterize exoplanets, extreme adaptive\noptics systems (AO) open a new window on the solar system by resolving its\nsmall bodies. Nonetheless, despite the always increasing performances of AO\nsystems, t…