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View article: Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning Reveals the Giant Exoplanet AF Lep b in High-contrast Imaging Data from 2011
Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning Reveals the Giant Exoplanet AF Lep b in High-contrast Imaging Data from 2011 Open
The main challenge of exoplanet high-contrast imaging (HCI) is to separate the signal of exoplanets from their host stars, which are many orders of magnitude brighter. HCI for ground-based observations is further exacerbated by speckle noi…
View article: Bioverse: Giant Magellan Telescope and Extremely Large Telescope Direct Imaging and High-resolution Spectroscopy Assessment—Surveying Exo-Earth O<sub>2</sub> and Testing the Habitable Zone Oxygen Hypothesis
Bioverse: Giant Magellan Telescope and Extremely Large Telescope Direct Imaging and High-resolution Spectroscopy Assessment—Surveying Exo-Earth O<sub>2</sub> and Testing the Habitable Zone Oxygen Hypothesis Open
Biosignature detection in the atmospheres of Earth-like exoplanets is one of the most significant and ambitious goals for astronomy, astrobiology, and humanity. Molecular oxygen is among the strongest indicators of life on Earth, but it wi…
View article: The GPU-based High-order adaptive OpticS Testbench
The GPU-based High-order adaptive OpticS Testbench Open
The GPU-based High-order adaptive OpticS Testbench (GHOST) at the European Southern Observatory (ESO) is a new 2-stage extreme adaptive optics (XAO) testbench at ESO. The GHOST is designed to investigate and evaluate new control methods (m…
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: A temperate super-Jupiter imaged with JWST in the mid-infrared
A temperate super-Jupiter imaged with JWST in the mid-infrared Open
View article: Power of prediction: spatiotemporal Gaussian process modeling for predictive control in slope-based wavefront sensing
Power of prediction: spatiotemporal Gaussian process modeling for predictive control in slope-based wavefront sensing Open
Time delay error is a significant error source in adaptive optics (AO) systems. It arises from the latency between sensing the wavefront and applying the correction. Predictive control algorithms reduce the time delay error, providing sign…
View article: The power of prediction: spatiotemporal Gaussian process modeling for predictive control in slope-based wavefront sensing
The power of prediction: spatiotemporal Gaussian process modeling for predictive control in slope-based wavefront sensing Open
Time-delay error is a significant error source in adaptive optics (AO) systems. It arises from the latency between sensing the wavefront and applying the correction. Predictive control algorithms reduce the time-delay error, providing sign…
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: Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning reveals the Giant Exoplanet AF Lep b in High-Contrast Imaging Data from 2011
Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning reveals the Giant Exoplanet AF Lep b in High-Contrast Imaging Data from 2011 Open
The main challenge of exoplanet high-contrast imaging (HCI) is to separate the signal of exoplanets from their host stars, which are many orders of magnitude brighter. HCI for ground-based observations is further exacerbated by speckle noi…
View article: Bioverse: GMT and ELT Direct Imaging and High-Resolution Spectroscopy Assessment $\unicode{x2013}$ Surveying Exo-Earth O$_{\mathrm{2}}$ and Testing the Habitable Zone Oxygen Hypothesis
Bioverse: GMT and ELT Direct Imaging and High-Resolution Spectroscopy Assessment $\unicode{x2013}$ Surveying Exo-Earth O$_{\mathrm{2}}$ and Testing the Habitable Zone Oxygen Hypothesis Open
Biosignature detection in the atmospheres of Earth-like exoplanets is one of the most significant and ambitious goals for astronomy, astrobiology, and humanity. Molecular oxygen is among the strongest indicators of life on Earth, but it wi…
View article: SPHERE RefPlanets: Search for <i>ε</i> Eridani b and warm dust
SPHERE RefPlanets: Search for <i>ε</i> Eridani b and warm dust Open
Context. Cold planets, including all habitable planets, produce only scattered light emission in the visual to near-infrared wavelength range. For this reason it is highly desirable to adapt the technique for the direct imaging of reflecte…
View article: Laboratory experiments of model-based reinforcement learning for adaptive optics control
Laboratory experiments of model-based reinforcement learning for adaptive optics control Open
Direct imaging of Earth-like exoplanets is one of the most prominent scientific drivers of the next generation of ground-based telescopes. Typically, Earth-like exoplanets are located at small angular separations from their host stars, mak…
View article: Laboratory Experiments of Model-based Reinforcement Learning for Adaptive Optics Control
Laboratory Experiments of Model-based Reinforcement Learning for Adaptive Optics Control Open
Direct imaging of Earth-like exoplanets is one of the most prominent scientific drivers of the next generation of ground-based telescopes. Typically, Earth-like exoplanets are located at small angular separations from their host stars, mak…
View article: First light of VLT/HiRISE: High-resolution spectroscopy of young giant exoplanets
First light of VLT/HiRISE: High-resolution spectroscopy of young giant exoplanets Open
A major endeavor of this decade is the direct characterization of young giant exoplanets at high spectral resolution to determine the composition of their atmosphere and infer their formation processes and evolution. Such a goal represents…
View article: First light of VLT/HiRISE: High-resolution spectroscopy of young giant exoplanets
First light of VLT/HiRISE: High-resolution spectroscopy of young giant exoplanets Open
A major endeavor of this decade is the direct characterization of young giant exoplanets at high spectral resolution to determine the composition of their atmosphere and infer their formation processes and evolution. Such a goal represents…
View article: The Bi-O-edge wavefront sensor: How Foucault-knife-edge variants can boost eXtreme Adaptive Optics
The Bi-O-edge wavefront sensor: How Foucault-knife-edge variants can boost eXtreme Adaptive Optics Open
Direct detection of exoplanets around nearby stars requires advanced Adaptive Optics (AO) systems. High order systems are needed to reach high Strehl Ratio (SR) in near infrared and optical wavelengths on future Giant Segmented Mirror Tele…
View article: Comparing Apples with Apples: Robust Detection Limits for Exoplanet High-contrast Imaging in the Presence of Non-Gaussian Noise
Comparing Apples with Apples: Robust Detection Limits for Exoplanet High-contrast Imaging in the Presence of Non-Gaussian Noise Open
Over the past decade, hundreds of nights have been spent on the world’s largest telescopes to search for and directly detect new exoplanets using high-contrast imaging (HCI). Thereby, two scientific goals are of central interest: first, to…
View article: The beta Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
The beta Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR Open
[abridged] We analyzed mid-infrared high-contrast coronagraphic images of the beta Pictoris system, taking advantage of the NEAR experiment using the VLT/VISIR instrument. The goal of our analysis is to investigate both the detection of th…
View article: The <i>β</i> Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
The <i>β</i> Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR Open
Context. β Pictoris is a young nearby system hosting a well-resolved edge-on debris disk, along with at least two exoplanets. It offers key opportunities for carrying out detailed studies of the evolution of young planetary systems and the…
View article: Comparing Apples with Apples: Robust Detection Limits for Exoplanet High-Contrast Imaging in the Presence of non-Gaussian Noise
Comparing Apples with Apples: Robust Detection Limits for Exoplanet High-Contrast Imaging in the Presence of non-Gaussian Noise Open
Over the past decade, hundreds of nights have been spent on the worlds largest telescopes to search for and directly detect new exoplanets using high-contrast imaging (HCI). Thereby, two scientific goals are of central interest: First, to …
View article: Disentangled cascade adaptive optics for the SPHERE instrument forthcoming upgrade
Disentangled cascade adaptive optics for the SPHERE instrument forthcoming upgrade Open
The Spectro-Polarimetric High-contrast Exoplanet REsearch instrument (SPHERE) is a European Southern Observatory (ESO) exoplanet imaging instrument installed on the 8m Very Large Telescope at Paranal (Chile). The results obtained during 8 …
View article: Exoplanet imaging with ELTs: exploring a second-stage AO with a Zernike wavefront sensor on the ESO/GHOST testbed
Exoplanet imaging with ELTs: exploring a second-stage AO with a Zernike wavefront sensor on the ESO/GHOST testbed Open
We propose to explore a cascade extreme Adaptive optics (ExAO) approach with a second stage based on a Zernike wavefront sensor (ZWFS) for exoplanet imaging and spectroscopy. Most exoplanet imagers currently use a single-stage ExAO to corr…
View article: Non Common Path Aberrations Correction
Non Common Path Aberrations Correction Open
The primary goal of this thesis was the correction of Non-Common-Path-Aberrations in the SPHERE instrument for helping it meeting its contrast requirements. SPHERE's purpose is the search and characterization of giant exo-planets around ne…
View article: Efficiently combining <i>α</i> CenA multi-epoch high-contrast imaging data
Efficiently combining <i>α</i> CenA multi-epoch high-contrast imaging data Open
Context. Keplerian-Stacker is an algorithm capable of combining multiple observations acquired at different epochs by taking into account the orbital motion of a potential planet present in the images to boost the ultimate detection limit.…
View article: Lessons learned from the NEAR experiment and prospects for the upcoming mid-IR HCI instruments
Lessons learned from the NEAR experiment and prospects for the upcoming mid-IR HCI instruments Open
The mid-infrared (IR) regime is well suited to directly detect the thermal\nsignatures of exoplanets in our solar neighborhood. The NEAR experiment:\ndemonstration of high-contrast imaging (HCI) capability at ten microns, can\nreach sub-mJ…
View article: Connecting SPHERE and CRIRES+ for the characterisation of young exoplanets at high spectral resolution: status update of VLT/HiRISE
Connecting SPHERE and CRIRES+ for the characterisation of young exoplanets at high spectral resolution: status update of VLT/HiRISE Open
International audience
View article: Imaging nearby, habitable-zone planets with the Large Binocular Telescope Interferometer
Imaging nearby, habitable-zone planets with the Large Binocular Telescope Interferometer Open
editorial reviewed
View article: Upgrading the high contrast imaging facility SPHERE: science drivers and instrument choices
Upgrading the high contrast imaging facility SPHERE: science drivers and instrument choices Open
SPHERE+ is a proposed upgrade of the SPHERE instrument at the VLT, which is\nintended to boost the current performances of detection and characterization\nfor exoplanets and disks. SPHERE+ will also serve as a demonstrator for the\nfuture …
View article: Orbital and dynamical analysis of the system around HR 8799
Orbital and dynamical analysis of the system around HR 8799 Open
Context. HR 8799 is a young planetary system composed of four planets and a double debris belt. Being the first multi-planetary system discovered with the direct imaging technique, it has been observed extensively since 1998. This wide bas…
View article: Efficiently combining Alpha CenA multi-epoch high-contrast imaging data. Application of K-Stacker to the 80 hrs NEAR campaign
Efficiently combining Alpha CenA multi-epoch high-contrast imaging data. Application of K-Stacker to the 80 hrs NEAR campaign Open
Keplerian-Stacker is an algorithm able to combine multiple observations acquired at different epochs taking into account the orbital motion of a potential planet present in the images to boost the ultimate detection limit. In 2019, a total…