Jean-Philippe Berger
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View article: Constraints on the Orbit of the Young Substellar Companion GQ Lup B from High-resolution Spectroscopy and VLTI/GRAVITY Astrometry <sup>*</sup>
Constraints on the Orbit of the Young Substellar Companion GQ Lup B from High-resolution Spectroscopy and VLTI/GRAVITY Astrometry <sup>*</sup> Open
Understanding the orbits of giant planets is critical for testing planet formation models, particularly at wide separations (>10 au) where traditional core accretion becomes inefficient. However, constraining orbits at these separations ha…
View article: Spatially resolved broad line region in a quasar at z=4: Dynamical black hole mass and prominent outflow
Spatially resolved broad line region in a quasar at z=4: Dynamical black hole mass and prominent outflow Open
We present the first near-infrared interferometric data of a QSO at z=4. The K-band observations were performed with GRAVITY+ on the VLTI using all 4 UTs, detecting a differential phase signal that traces the spatially resolved kinematics …
View article: Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY
Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY Open
Context . Inferring the likely formation channel of giant exoplanets and brown dwarf companions from orbital and atmospheric observables remains a formidable challenge. Further and more precise directly measured dynamical masses of these c…
View article: Exploring the presence of a fifth force at the Galactic Center
Exploring the presence of a fifth force at the Galactic Center Open
Aims. We investigate the presence of a Yukawa-like correction to Newtonian gravity at the Galactic Center, leading to a new upper limit on the intensity of such a correction. Methods. We performed a Markov chain Monte Carlo (MCMC) analysis…
View article: A Tentative Detection of a Point Source in the Disk Gap of HD 100546 with VLT/SPHERE-IRDIS Sparse Aperture Masking Interferometry*
A Tentative Detection of a Point Source in the Disk Gap of HD 100546 with VLT/SPHERE-IRDIS Sparse Aperture Masking Interferometry* Open
We reanalyze VLT/SPHERE-IRDIS K- and H -band sparse aperture masking interferometry data of the transition disk HD 100546 observed in 2018 and 2021, respectively. We fit geometrical models to the closure phases extracted from both datasets…
View article: A Tentative Detection of a Point Source in the Disk Gap of HD 100546 with VLT/SPHERE-IRDIS Sparse Aperture Masking Interferometry
A Tentative Detection of a Point Source in the Disk Gap of HD 100546 with VLT/SPHERE-IRDIS Sparse Aperture Masking Interferometry Open
We re-analyze VLT/SPHERE-IRDIS K and H-band sparse aperture masking interferometry data of the transition disk HD 100546 observed in 2018 and 2021, respectively. We fit geometrical models to the closure phases extracted from both datasets.…
View article: Direct imaging discovery of a young giant planet orbiting on Solar System scales
Direct imaging discovery of a young giant planet orbiting on Solar System scales Open
Contains fulltext : 321440.pdf (Publisher’s version ) (Open Access)
View article: First Resolution of Microlensed Images of a Binary-lens Event
First Resolution of Microlensed Images of a Binary-lens Event Open
We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysi…
View article: Improving constraints on the extended mass distribution in the Galactic center with stellar orbits
Improving constraints on the extended mass distribution in the Galactic center with stellar orbits Open
Studying the orbital motion of stars around Sagittarius A* in the Galactic center provides a unique opportunity to probe the gravitational potential near the supermassive black hole at the heart of our Galaxy. Interferometric data obtained…
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: Archean craton assembly and Paleoproterozoic accretion-collision tectonics in the Reguibat Shield, West African Craton
Archean craton assembly and Paleoproterozoic accretion-collision tectonics in the Reguibat Shield, West African Craton Open
View article: First Resolution of Microlensed Images of a Binary-Lens Event
First Resolution of Microlensed Images of a Binary-Lens Event Open
We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysi…
View article: L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans
L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans Open
editorial reviewed
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context. The dust- and gas-rich protoplanetary disks around young stellar systems play a key role in star and planet formation. While considerable progress has recently been made in probing these disks on large scales of a few tens of astr…
View article: L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans
L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans Open
NOTT (formerly Hi-5) is the L'-band (3.5-4.0~microns) nulling interferometer of Asgard, an instrument suite in preparation for the VLTI visitor focus. The primary scientific objectives of NOTT include characterizing (i) young planetary sys…
View article: Simplified model(s) of the GRAVITY+ adaptive optics system(s) for performance prediction
Simplified model(s) of the GRAVITY+ adaptive optics system(s) for performance prediction Open
In the context of the GRAVITY+ upgrade, the adaptive optics (AO) systems of\nthe GRAVITY interferometer are undergoing a major lifting. The current CILAS\ndeformable mirrors (DM, 90 actuators) will be replaced by ALPAO kilo-DMs\n(43x43, 14…
View article: A new dimension in the variability of AGB stars: Convection patterns size changes with pulsation
A new dimension in the variability of AGB stars: Convection patterns size changes with pulsation Open
Context. Stellar convection plays an important role in atmospheric dynamics, wind formation, and the mass-loss processes in asymptotic giant branch stars. However, a direct characterization of convective surface structures in terms of size…
View article: Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY
Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY Open
The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term …
View article: Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY
Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY Open
The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term …
View article: High contrast at short separation with VLTI/GRAVITY: Bringing <i>Gaia</i> companions to light
High contrast at short separation with VLTI/GRAVITY: Bringing <i>Gaia</i> companions to light Open
Context. Since 2019, GRAVITY has provided direct observations of giant planets and brown dwarfs at separations of down to 95 mas from the host star. Some of these observations have provided the first direct confirmation of companions previ…
View article: Using the motion of S2 to constrain vector clouds around Sgr A*
Using the motion of S2 to constrain vector clouds around Sgr A* Open
The dark compact object at the centre of the Milky Way is well established to be a supermassive black hole with mass $M_{\bullet } \sim 4.3 \times 10^6 \, {\rm M}_{\odot }$, but the nature of its environment is still under debate. In this …
View article: Asgard/NOTT: L-band nulling interferometry at the VLTI. II. Warm optical design and injection system
Asgard/NOTT: L-band nulling interferometry at the VLTI. II. Warm optical design and injection system Open
Asgard/NOTT (previously Hi-5) is a European Research Council (ERC)-funded project hosted at KU Leuven and a new visitor instrument for the Very Large Telescope Interferometer (VLTI). Its primary goal is to image the snow line region around…
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Aims . We aim to investigate the origin of the HI Br γ emission in young stars by using GRAVITY to image the innermost region of circumstellar disks, where important physical processes such as accretion and winds occur. With high spectral …
View article: The GRAVITY young stellar object survey XIII. Tracing the time-variable asymmetric disk structure in the inner AU of the Herbig star HD98922
The GRAVITY young stellar object survey XIII. Tracing the time-variable asymmetric disk structure in the inner AU of the Herbig star HD98922 Open
Temporal variability in the photometric and spectroscopic properties of protoplanetary disks is common in YSO. However, evidence pointing toward changes in their morphology over short timescales has only been found for a few sources, mainl…
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context . Temporal variability in the photometric and spectroscopic properties of protoplanetary disks is common in young stellar objects. However, evidence pointing toward changes in their morphology over short timescales has only been fo…
View article: A dynamical measure of the black hole mass in a quasar 11 billion years ago
A dynamical measure of the black hole mass in a quasar 11 billion years ago Open
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context . The region of protoplanetary disks closest to a star (within 1–2 au) is shaped by a number of different processes, from accretion of the disk material onto the central star to ejection in the form of winds and jets. Optical and n…
View article: Correction to: Using the motion of S2 to constrain scalar clouds around Sgr A*
Correction to: Using the motion of S2 to constrain scalar clouds around Sgr A* Open
View article: VLTI/GRAVITY Provides Evidence the Young, Substellar Companion HD 136164 Ab Formed Like a “Failed Star”
VLTI/GRAVITY Provides Evidence the Young, Substellar Companion HD 136164 Ab Formed Like a “Failed Star” Open
Young, low-mass brown dwarfs orbiting early-type stars, with low mass ratios ( q ≲ 0.01), appear to be intrinsically rare and present a formation dilemma: could a handful of these objects be the highest-mass outcomes of “planetary” formati…
View article: The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars
The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars Open
The region of protoplanetary disks closest to a star (within 1-2\,au) is shaped by a number of different processes, from accretion of the disk material onto the central star to ejection in the form of winds and jets. Optical and near-IR em…