M. Langlois
A5041219071- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Optical Systems and Laser Technology
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Advanced optical system design
- Gamma-ray bursts and supernovae
- Optical Wireless Communication Technologies
- Molecular Spectroscopy and Structure
- Astrophysical Phenomena and Observations
- Infrared Target Detection Methodologies
- Optical Polarization and Ellipsometry
- solar cell performance optimization
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Atmospheric Ozone and Climate
- Spectroscopy Techniques in Biomedical and Chemical Research
- Optical measurement and interference techniques
- Spectroscopy and Laser Applications
- Spectroscopy and Chemometric Analyses
- Spacecraft Design and Technology
Centre de Recherche Astrophysique de Lyon
2015-2024
Université Claude Bernard Lyon 1
2015-2024
Centre National de la Recherche Scientifique
2015-2024
École Normale Supérieure de Lyon
2015-2024
New York University
2024
University of Liège
2024
Laboratoire d’Astrophysique de Marseille
2013-2023
Aix-Marseille Université
2015-2023
Château Gombert
2008-2022
Observatoire de Lyon
2010-2022
Direct detection and spectral characterization of extra-solar planets is one the most exciting but also challenging areas in modern astronomy. The challenge consists very large contrast between host star planet, larger than 12.5 magnitudes at small angular separations, typically inside seeing halo. whole design a "Planet Finder" instrument therefore optimized towards reaching highest limited field view short distances from central star. Both evolved young planetary systems can be detected,...
The study of dynamical processes in protoplanetary disks is essential to understand planet formation. In this context, transition are prime targets because they at an advanced stage disk clearing and may harbor direct signatures evolution. paper, we aim derive new constraints on the structure MWC 758, detect non-axisymmetric features their origin. We obtained infrared polarized intensity observations 758 with SPHERE/VLT 1.04 microns resolve scattered light a smaller inner working angle...
Young circumstellar disks are of prime interest to understand the physical and chemical conditions under which planet formation takes place. Only very few detections candidates within these exist, most them currently suspected be disk features. In this context, transition around young star PDS 70 is particular interest, due its large gap identified in previous observations, indicative ongoing formation. We aim search for presence planets structures disk-planet interactions other evolutionary...
The direct detection of exoplanets has been the subject intensive research in recent years. Data obtained with future high-contrast imaging instruments optimized for giant planets are strongly limited by speckle noise. Specific observing strategies and data analysis methods, such as angular spectral differential imaging, required to attenuate noise level possibly detect faint planet flux. Even though these methods very efficient at suppressing speckles, photometry is dominated residuals....
Observations of circumstellar environments to look for the direct signal exoplanets and scattered light from disks has significant instrumental implications. In past 15 years, major developments in adaptive optics, coronagraphy, optical manufacturing, wavefront sensing data processing, together with a consistent global system analysis have enabled new generation high-contrast imagers spectrographs on large ground-based telescopes much better performance. One most productive is...
The SHINE program is a large high-contrast near-infrared survey of 600 young, nearby stars. It aimed at searching for and characterizing new planetary systems using VLT/SPHERE's unprecedented high-angular resolution imaging capabilities. also intends placing statistical constraints on the occurrence orbital properties giant planet population orbits as function stellar host mass age to test formation theories. We use IRDIS dual-band imager IFS integral field spectrograph SPHERE acquire...
Aims: We aim to characterize the orbital and atmospheric properties of PDS 70 b, which was first identified on May 2015 in course SHINE survey with SPHERE, extreme adaptive-optics instrument at VLT. Methods: obtained new deep SPHERE/IRDIS imaging SPHERE/IFS spectroscopic observations b. The astrometric baseline now covers 6 years allows us perform an analysis. For time, we present spectrophotometry young planet almost entire near-infrared range (0.96 3.8 micrometer). use different models...
The SPHERE (Spectro-Polarimetric High-contrast Exoplanet Research) planet finder instrument for ESO's VLT telescope, scheduled first light in 2011, aims to detect giant extra-solar planets the vicinity of bright stars by aid an extreme-AO turbulence compensation system and characterize objects found through spectroscopic polarimetric observations. Dual imaging observations within Y, J, H Ks atmospheric windows (~0.95 - 2.32μm) will be done IRDIS cryogenic camera. We describe briefly science...
The planetary system discovered around the young A-type HR8799 provides a unique laboratory to: a) test planet formation theories, b) probe diversity of architectures at these separations, and c) perform comparative (exo)planetology. We present exploit new near-infrared images integral-field spectra four gas giants surrounding obtained with SPHERE, finder instrument Very Large Telescope, during commissioning science verification phase (July-December 2014). With data, we contribute to...
Context. The protoplanetary disk around the F-type star HD 135344B (SAO 206462) is in a transition stage and shows many intriguing structures both scattered light thermal (sub-)millimeter emission which are possibly related to planet formation processes.
51 Eridani b is an exoplanet around a young (20 Myr) nearby (29.4 pc) F0-type star, recently discovered by direct imaging. Being only 0.5" away from its host star it well suited for spectroscopic analysis using integral field spectrographs. We aim to refine the atmospheric properties of this and further constrain architecture system searching additional companions. Using SPHERE instrument at VLT we extend spectral coverage planet complete Y- H-band range provide photometry in K12-bands...
Understanding the diversity of planets requires to study morphology and physical conditions in protoplanetary disks which they form. We observed spatially resolved disk around ~10 Myr old HD 100453 polarized scattered light with SPHERE/VLT at optical near-infrared wavelengths, reaching an angular resolution ~0.02", inner working angle ~0.09". detect up ~0.42" (~48 au) a cavity, rim azimuthal brightness variations inclination 38 degrees, two shadows symmetric spiral arms. The arms originate...
We present the performance of Integral Field Spectrograph (IFS) SPHERE, high-contrast imager for ESO VLT telescope designed to perform imaging and spectroscopy extrasolar planets, obtained from tests performed at Institute de Plan\'etologie et d'Astrophysique Grenoble facility during integration phase instrument.} {The were using instrument software purposely prepared SPHERE. The output data reduced applying SPHERE reduction handling software, adding an improved spectral deconvolution...
The system of four planets around HR8799 offers a unique opportunity to probe the physics and chemistry at play in atmospheres self-luminous young (~30 Myr) planets. We recently obtained new photometry low-resolution (R~30) spectra d e with SPHERE instrument (paper III). In this paper IV), we compare available known objects atmospheric models (BT-SETTL14, Cloud-AE60, Exo-REM) characterize properties find that HR8799d are well reproduced by those L6-L8 dusty dwarfs discovered field, among...
Abstract We present scattered light images of the TW Hya disk performed with Spectro-Polarimetric High-contrast Exoplanet REsearch instrument in Polarimetric Differential Imaging mode at 0.63, 0.79, 1.24, and 1.62 μ m. also H2/H3-band angular differential imaging (ADI) observations. Three distinct radial depressions polarized intensity distribution are seen, around ≈85, ≈21, ≲6 au. 21 The overall has a high degree azimuthal symmetry; is somewhat brighter than average toward south darker...
[Abridged] Context. The young systems PZ Tel and HD 1160, hosting known low-mass companions, were observed during the commissioning of new planet finder SPHERE with several imaging spectroscopic modes. Aims. We aim to refine physical properties architecture both systems. Methods. use data REM observations, as well literature unpublished from VLT/SINFONI, VLT/NaCo, Gemini/NICI, Keck/NIRC2. Results. derive photometry confirm nearly daily photometric variability A. Using spanning 38 yr, we show...
The variety of observed protoplanetary disks in polarimetric light motivates a taxonomical study to constrain their evolution and establish the current framework this type observations. We classified 58 with available observations into six major categories (Ring, Spiral, Giant, Rim, Faint, Small disks) based on appearance scattered light. re-calculated stellar disk properties from newly GAIA DR2 related these categories. More than half our sample shows sub-structures. For remaining sources,...
Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs can be characterized through direct-imaging polarimetry at near-infrared wavelengths. SPHERE/IRDIS the Very Large Telescope has capabilities to perform such measurements, but uncalibrated instrumental polarization effects limit attainable polarimetric accuracy. Aims. We aim characterize correct of complete optical system, that is, telescope SPHERE/IRDIS. Methods. created a detailed Mueller matrix model...
GJ758 B is a brown dwarf companion to nearby (15.76 pc) solar-type, metal-rich (M/H = +0.2 dex) main-sequence star (G9V) that was discovered with Subaru/HiCIAO in 2009. From previous studies, it has drawn attention as being the coldest (~600K) ever directly imaged around neighboring star. We present new high-contrast data obtained during commissioning of SPHERE instrument at VLT. The Y-, J-, H-, and Ks-bands dual-band imaging (DBI) mode IRDIS, providing broad coverage full near-infrared...
We present the current results of astrometric characterization VLT planet finder SPHERE over 2 years on-sky operations. first describe criteria for selection fields used calibrating science data: binaries, multiple systems, and stellar clusters. The analysis includes measurements pixel scale position angle with respect to North both near-infrared subsystems, camera IRDIS integral field spectrometer IFS, as well distortion camera. is shown be dominated by an anamorphism 0.60+/-0.02% between...
The substellar companion HD206893b has recently been discovered by direct imaging of its disc-bearing host star with the SPHERE instrument. We investigate atypical properties companion, which reddest near-infrared colours among all known objects, either orbiting a or isolated, and we provide comprehensive characterisation star-disc-companion system. conducted follow-up adaptive optics spectro-imaging SPHERE, multiinstrument star. obtain R=30 spectrum from 0.95 to 1.64 micron additional...