List of works - Julien H. Girard

A MUSE view of the asymmetric jet from HD 163296 ⬇️

journal article from 'Astronomy & Astrophysics' published in 2021

A Resolved and Asymmetric Ring of PAHs within the Young Circumstellar Disk of IRS 48

scientific article published in the Astrophysical Journal

A combined very large telescope and Gemini study of the atmosphere of the directly imaged planet, {beta} Pictoris b ⬇️

scientific article published in the Astrophysical Journal

A multiplicity census of intermediate-mass stars in Scorpius-Centaurus ⬇️

scientific article published in the Astrophysical Journal

A search for passive protoplanetary discs in the Taurus–Auriga star-forming region

scientific article

A young protoplanet candidate embedded in the circumstellar disk of HD 100546 ⬇️

scientific article

ABISM: an interactive image quality assessment tool for adaptive optics instruments

Adaptive Optics in High-Contrast Imaging ⬇️

An apodizing phase plate coronagraph for VLT/NACO

Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO

Characterizing instrumental effects on polarization at a Nasmyth focus using NaCo

Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets

Conceptual study for a sub-pupil instrument having 4 high order adaptive optics path for parallel multi-wavelength high contrast imaging, and medium resolution spectrometry

Confirmation and characterization of the protoplanet HD 100546 b--Direct evidence for gas giant planet formation at 50 AU ⬇️

scientific article published in the Astrophysical Journal

Coronagraphic observations of Fomalhaut at solar system scales ⬇️

scientific article published in the Astrophysical Journal

Deep thermal infrared imaging of HR 8799 bcde: new atmospheric constraints and limits on a fifth planet ⬇️

scientific article published in the Astrophysical Journal

Detection of Polarization due to Cloud Bands in the Nearby Luhman 16 Brown Dwarf Binary

scientific article

Direct Discovery of the Inner Exoplanet in the HD206893 System

Direct imaging of sub-Jupiter mass exoplanets with James Webb Space Telescope coronagraphy

scientific article published in February 2021

Direct imaging with a dense aperture masking in comparison with a telescope or a hypertelelescope

scholarly article published 22 September 2011

Discovery of a companion candidate in the HD 169142 transition disk and the possibility of multiple planet formation ⬇️

scholarly article

Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893 ⬇️

scientific article published in Astronomy and Astrophysics

Discretized aperture mapping with a micro-lenses array for interferometric direct imaging

Dynamical masses of M-dwarf binaries in young moving groups

scientific article

Evaluation of performance of the MACAO systems at the VLTI

Fast-moving features in the debris disk around AU Microscopii

scientific article

Feasibility study of the polychromatic laser guide star

First High-Angular Resolution L′ Images of the β Pictoris Debris Disc with the VLT / NaCo

First Scattered-light Images of the Gas-rich Debris Disk around 49 Ceti ⬇️

scholarly article

First light of the VLT planet finder SPHERE ⬇️

scientific article published in Astronomy and Astrophysics

Flows of gas through a protoplanetary gap.

scientific article

Follow-up observations of binary ultra-cool dwarfs

scientific article published in Astronomy and Astrophysics

Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY

High-angular resolution observations of the Pistol star

ISPY – NaCo Imaging Survey for Planets around Young stars

scientific article

Interferometric direct imaging properties of a BIGRE-DAM device in laboratory

Investigating three Sirius-like systems with SPHERE

scholarly article

JWST-TST High Contrast: JWST/NIRCam observations of the young giant planet $β$ Pic b

Lessons for WFIRST CGI from ground-based high-contrast systems

Low wind effect on VLT/SPHERE: impact, mitigation strategy, and results

Luminous blue variables: An imaging perspective on their binarity and near environment ⬇️

scientific article published in Astronomy and Astrophysics

Making good use of JWST's coronagraphs: tools and strategies from a user's perspective

article published in 2018

Measurement of the flux of ultrahigh energy cosmic rays from monocular observations by the High Resolution Fly's Eye experiment.

scientific article published on 15 April 2004

New brown dwarf companions to young stars in Scorpius-Centaurus ⬇️

scholarly article

Real-time Strehl and image quality performance estimator at Paranal Observatory

Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems

scholarly article published 22 August 2012

SAXO: the extreme adaptive optics system of SPHERE (I) system overview and global laboratory performance

SPHERE IRDIS and IFS astrometric strategy and calibration ⬇️

SPHERE on-sky performance compared with budget predictions

scholarly article published 9 August 2016

Small-angle, high-contrast exoplanet imaging with the L-band AGPM vector vortex coronagraph now offered at the VLT

Sparse aperture masking with SPHERE

scholarly article published 4 August 2016

Spatially extended emission around the Cepheid RS Puppis in near-infrared hydrogen lines

scientific article published in Astronomy and Astrophysics

Speckle imaging with the SOAR and the very large telescopes

Successes and challenges of the APP Coronagraph

Tackling down the low wind effect on SPHERE instrument

The ExoGRAVITY project: using single mode interferometry to characterize exoplanets

scientific article published on 16 December 2020

The JWST Early Release Science Program for the Direct Imaging & Spectroscopy of Exoplanetary Systems

scientific article published in 2022

The James Webb Space Telescope Mission

scientific article published in June 2023

The Polychromatic Laser Guide Star for tilt measurement: progress report of the demonstrator at Observatoire de Haute Provence

The SHARDDS survey: First resolved image of the HD 114082 debris disk in the Lower Centaurus Crux with SPHERE ⬇️

scientific article published in Astronomy and Astrophysics

The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE

scholarly article

The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event

scholarly article

The hypertelescope at work with a BIGRE integral field unit

The inner dust shell of Betelgeuse detected by polarimetric aperture-masking interferometry

scientific article published in August 2019

The origin of the dusty envelope around Betelgeuse

Three years of harvest with the vector vortex coronagraph in the thermal infrared ⬇️

article

Two accreting protoplanets around the young star PDS 70

scientific article published on 3 June 2019

Two accreting protoplanets around the young star PDS 70

scientific article published in June 2019

List of works by Julien H. Girard

A MUSE view of the asymmetric jet from HD 163296 ⬇️

A Resolved and Asymmetric Ring of PAHs within the Young Circumstellar Disk of IRS 48

A combined very large telescope and Gemini study of the atmosphere of the directly imaged planet, {beta} Pictoris b ⬇️

A multiplicity census of intermediate-mass stars in Scorpius-Centaurus ⬇️

A search for passive protoplanetary discs in the Taurus–Auriga star-forming region

A young protoplanet candidate embedded in the circumstellar disk of HD 100546 ⬇️

ABISM: an interactive image quality assessment tool for adaptive optics instruments

Adaptive Optics in High-Contrast Imaging ⬇️

An apodizing phase plate coronagraph for VLT/NACO

Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO

Characterizing instrumental effects on polarization at a Nasmyth focus using NaCo

Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets

Conceptual study for a sub-pupil instrument having 4 high order adaptive optics path for parallel multi-wavelength high contrast imaging, and medium resolution spectrometry

Confirmation and characterization of the protoplanet HD 100546 b--Direct evidence for gas giant planet formation at 50 AU ⬇️

Coronagraphic observations of Fomalhaut at solar system scales ⬇️

Deep thermal infrared imaging of HR 8799 bcde: new atmospheric constraints and limits on a fifth planet ⬇️

Detection of Polarization due to Cloud Bands in the Nearby Luhman 16 Brown Dwarf Binary

Direct Discovery of the Inner Exoplanet in the HD206893 System

Direct imaging of sub-Jupiter mass exoplanets with James Webb Space Telescope coronagraphy

Direct imaging with a dense aperture masking in comparison with a telescope or a hypertelelescope

Discovery of a companion candidate in the HD 169142 transition disk and the possibility of multiple planet formation ⬇️

Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893 ⬇️

Discretized aperture mapping with a micro-lenses array for interferometric direct imaging

Dynamical masses of M-dwarf binaries in young moving groups

Evaluation of performance of the MACAO systems at the VLTI

Fast-moving features in the debris disk around AU Microscopii

Feasibility study of the polychromatic laser guide star

First High-Angular Resolution L′ Images of the β Pictoris Debris Disc with the VLT / NaCo

First Scattered-light Images of the Gas-rich Debris Disk around 49 Ceti ⬇️

First light of the VLT planet finder SPHERE ⬇️

Flows of gas through a protoplanetary gap.

Follow-up observations of binary ultra-cool dwarfs

Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY

High-angular resolution observations of the Pistol star

ISPY – NaCo Imaging Survey for Planets around Young stars

Interferometric direct imaging properties of a BIGRE-DAM device in laboratory

Investigating three Sirius-like systems with SPHERE

JWST-TST High Contrast: JWST/NIRCam observations of the young giant planet $β$ Pic b

Lessons for WFIRST CGI from ground-based high-contrast systems

Low wind effect on VLT/SPHERE: impact, mitigation strategy, and results

Luminous blue variables: An imaging perspective on their binarity and near environment ⬇️

Making good use of JWST's coronagraphs: tools and strategies from a user's perspective

Measurement of the flux of ultrahigh energy cosmic rays from monocular observations by the High Resolution Fly's Eye experiment.

New brown dwarf companions to young stars in Scorpius-Centaurus ⬇️

Real-time Strehl and image quality performance estimator at Paranal Observatory

Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems

SAXO: the extreme adaptive optics system of SPHERE (I) system overview and global laboratory performance

SPHERE IRDIS and IFS astrometric strategy and calibration ⬇️

SPHERE on-sky performance compared with budget predictions

Small-angle, high-contrast exoplanet imaging with the L-band AGPM vector vortex coronagraph now offered at the VLT

Sparse aperture masking with SPHERE

Spatially extended emission around the Cepheid RS Puppis in near-infrared hydrogen lines

Speckle imaging with the SOAR and the very large telescopes

Successes and challenges of the APP Coronagraph

Tackling down the low wind effect on SPHERE instrument

The ExoGRAVITY project: using single mode interferometry to characterize exoplanets

The JWST Early Release Science Program for the Direct Imaging & Spectroscopy of Exoplanetary Systems

The James Webb Space Telescope Mission

The Polychromatic Laser Guide Star for tilt measurement: progress report of the demonstrator at Observatoire de Haute Provence

The SHARDDS survey: First resolved image of the HD 114082 debris disk in the Lower Centaurus Crux with SPHERE ⬇️

The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE

The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event

The hypertelescope at work with a BIGRE integral field unit

The inner dust shell of Betelgeuse detected by polarimetric aperture-masking interferometry

The origin of the dusty envelope around Betelgeuse

Three years of harvest with the vector vortex coronagraph in the thermal infrared ⬇️

Two accreting protoplanets around the young star PDS 70

Two accreting protoplanets around the young star PDS 70

Updated optical modeling of JWST coronagraph performance contrast, stability, and strategies

β Pictoris b Orbital Properties