L. Klarmann
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View article: Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE
Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE Open
Context. Asymptotic giant branch (AGB) stars are one of the main sources of dust production in the Galaxy. However, it is not yet clear what this process looks like and where the dust happens to be condensing in the circumstellar environme…
View article: MATISSE, the VLTI mid-infrared imaging spectro-interferometer
MATISSE, the VLTI mid-infrared imaging spectro-interferometer Open
Context. Optical interferometry is at a key development stage. The Very Large Telescope Interferometer (VLTI) has established a stable, robust infrastructure for long-baseline interferometry that is usable by general astronomical observers…
View article: The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE
The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE Open
Context. VX Sgr is a cool, evolved, and luminous red star whose stellar parameters are difficult to determine, which affects its classification. Aims. We aim to spatially resolve the photospheric extent as well as the circumstellar environ…
View article: VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris
VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris Open
Context: FS Canis Majoris (FS CMa, HD 45677) is an unclassified B[e] star surrounded by an inclined dust disk. The evolutionary stage of FS CMa is still debated. Perpendicular to the circumstellar disk, a bipolar outflow was detected. Infr…
View article: VLTI-MATISSE <i>L</i>- and <i>N</i>-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris
VLTI-MATISSE <i>L</i>- and <i>N</i>-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris Open
Context. FS Canis Majoris (FS CMa, HD 45677) is an unclassified B[e] star surrounded by an inclined dust disk. The evolutionary stage of FS CMa is still debated. Perpendicular to the circumstellar disk, a bipolar outflow was detected. Infr…
View article: MATISSE, the VLTI mid-infrared imaging spectro-interferometer
MATISSE, the VLTI mid-infrared imaging spectro-interferometer Open
Context:Optical interferometry is at a key development stage. ESO's VLTI has\nestablished a stable, robust infrastructure for long-baseline interferometry\nfor general astronomical observers. The present second-generation instruments\noffe…
View article: The GRAVITY Young Stellar Object survey VIII. Gas and dust faint inner rings in the hybrid disk of HD141569
The GRAVITY Young Stellar Object survey VIII. Gas and dust faint inner rings in the hybrid disk of HD141569 Open
Context. The formation and evolution of planetary systems impact the evolution of the primordial accretion disk in its dust and gas content. HD 141569 is a peculiar object in this context as it is the only known pre-main sequence star char…
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context. The formation and evolution of planetary systems impact the evolution of the primordial accretion disk in its dust and gas content. HD 141569 is a peculiar object in this context as it is the only known pre-main sequence star char…
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context. T Tauri stars are surrounded by dust and gas disks. As material reservoirs from which matter is accreted onto the central star and planets are built, these protoplanetary disks play a central role in star and planet formation. Aim…
View article: VLTI-MATISSE chromatic aperture-synthesis imaging of <i>η</i> Carinae’s stellar wind across the Br<i>α</i> line
VLTI-MATISSE chromatic aperture-synthesis imaging of <i>η</i> Carinae’s stellar wind across the Br<i>α</i> line Open
Context. Eta Carinae is a highly eccentric, massive binary system (semimajor axis ~15.5 au) with powerful stellar winds and a phase-dependent wind-wind collision (WWC) zone. The primary star, η Car A, is a luminous blue variable (LBV); the…
View article: The GRAVITY Young Stellar Object Survey. VI. Mapping the variable inner disk of HD 163296 at sub-au scales
The GRAVITY Young Stellar Object Survey. VI. Mapping the variable inner disk of HD 163296 at sub-au scales Open
Protoplanetary disks drive some of the formation process (e.g., accretion, gas dissipation, formation of structures, etc.) of stars and planets. Understanding such physical processes is one of the main astrophysical questions. HD 163296 is…
View article: First MATISSE <i>L</i>-band observations of HD 179218
First MATISSE <i>L</i>-band observations of HD 179218 Open
Context. Carbon is one of the most abundant components in the Universe. While silicates have been the main focus of solid phase studies in protoplanetary discs (PPDs), little is known about the solid carbon content especially in the planet…
View article: The GRAVITY young stellar object survey - V. The orbit of the T Tauri binary star WW Cha
The GRAVITY young stellar object survey - V. The orbit of the T Tauri binary star WW Cha Open
Context. Close young binary stars are unique laboratories for the direct measurement of pre-main-sequence (PMS) stellar masses and their comparison to evolutionary theoretical models. At the same time, a precise knowledge of their orbital …
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context. Close young binary stars are unique laboratories for the direct measurement of pre-main-sequence (PMS) stellar masses and their comparison to evolutionary theoretical models. At the same time, a precise knowledge of their orbital …
View article: The GRAVITY young stellar object survey
The GRAVITY young stellar object survey Open
Context. 51 Oph is a Herbig Ae/Be star that exhibits strong near-infrared CO ro-vibrational emission at 2.3 μ m, most likely originating in the innermost regions of a circumstellar disc. Aims. We aim to obtain the physical and geometrical …
View article: The GRAVITY Young Stellar Object survey IV. The CO overtone emission in\n 51 Oph at sub-au scales
The GRAVITY Young Stellar Object survey IV. The CO overtone emission in\n 51 Oph at sub-au scales Open
51 Oph is a Herbig Ae/Be star that exhibits strong near-infrared CO\nro-vibrational emission at 2.3 micron, most likely originating in the innermost\nregions of a circumstellar disc. We aim to obtain the physical and geometrical\npropertie…
View article: The GRAVITY young stellar object survey: III. The dusty disk of RY Lup
The GRAVITY young stellar object survey: III. The dusty disk of RY Lup Open
Context. Studies of the dust distribution, composition, and evolution of protoplanetary disks provide clues for understanding planet formation. However, little is known about the innermost regions of disks where telluric planets are expect…
View article: The GRAVITY Young Stellar Object survey -- I. Probing the disks of Herbig Ae/Be stars in terrestrial orbits
The GRAVITY Young Stellar Object survey -- I. Probing the disks of Herbig Ae/Be stars in terrestrial orbits Open
The formation and the evolution of protoplanetary disks are important stages in the lifetime of stars. The processes of disk evolution and planet formation are intrinsically linked. We spatially resolve with GRAVITY/VLTI in the K-band the …
View article: The GRAVITY Young Stellar Object survey
The GRAVITY Young Stellar Object survey Open
Context. The formation and the evolution of protoplanetary disks are important stages in the lifetime of stars. Terrestrial planets form or migrate within the innermost regions of these protoplanetary disks and so, the processes of disk ev…
View article: A Realistic Roadmap to Formation Flying Space Interferometry
A Realistic Roadmap to Formation Flying Space Interferometry Open
The ultimate astronomical observatory would be a formation flying interferometer in space, immune to atmospheric turbulence and absorption, free from atmospheric and telescope thermal emission, and reconfigurable to adjust baselines accord…
View article: Astro2020 Science White Paper. The Future of Exoplanet Direct Detection
Astro2020 Science White Paper. The Future of Exoplanet Direct Detection Open
International audience
View article: An Image of the Dust Sublimation Region in the Nucleus of NGC 1068
An Image of the Dust Sublimation Region in the Nucleus of NGC 1068 Open
The superb resolution of the Very Large Telescope Interferometer (VLTI) and the unrivalled sensitivity of GRAVITY have allowed us to reconstruct the first detailed image of the dust sublimation region in an active galaxy. In the nearby arc…
View article: Images at the Highest Angular Resolution with GRAVITY: The Case of η Carinae
Images at the Highest Angular Resolution with GRAVITY: The Case of η Carinae Open
The main goal of an interferometer is to probe the physics of astronomical objects at the highest possible angular resolution. The most intuitive way of doing this is by reconstructing images from the interferometric data. GRAVITY at the V…
View article: Spatially Resolving the Inner Gaseous Disc of the Herbig Star 51 Oph through its CO Ro-vibration Emission
Spatially Resolving the Inner Gaseous Disc of the Herbig Star 51 Oph through its CO Ro-vibration Emission Open
Near-infrared interferometry gives us the opportunity to spatially resolve the circumstellar environment of young stars at sub-astronomical-unit (au) scales, which a standalone telescope could not reach. In particular, the sensitivity of G…
View article: Probing the Discs of Herbig Ae/Be Stars at Terrestrial Orbits
Probing the Discs of Herbig Ae/Be Stars at Terrestrial Orbits Open
More than 4000 exoplanets are known to date in systems that differ greatly from our Solar System. In particular, inner exoplanets tend to follow orbits around their parent star that are much more compact than that of Earth. These systems a…
View article: Hunting Exoplanets with Single-Mode Optical Interferometry
Hunting Exoplanets with Single-Mode Optical Interferometry Open
The GRAVITY instrument was primarily conceived for imaging and astrometry of the Galactic centre. However, its sensitivity and astrometric capabilities have also enabled interferometry to reach a new domain of astrophysics: exoplanetology.…
View article: Multiple Star Systems in the Orion Nebula
Multiple Star Systems in the Orion Nebula Open
GRAVITY observations reveal that most massive stars in the Orion Trapezium cluster live in multiple systems. Our deep, milliarcsecond-resolution interferometry fills the gap at 1–100 astronomical units (au), which is not accessible to trad…
View article: GRAVITY and the Galactic Centre
GRAVITY and the Galactic Centre Open
On a clear night, our home galaxy, the Milky Way, is visible as a starry ribbon across the sky. Its core is located in the constellation of Sagittarius, approximately where the bright glow is interrupted by the darkest dust filaments. Ther…
View article: Spatially Resolving the Quasar Broad Emission Line Region
Spatially Resolving the Quasar Broad Emission Line Region Open
The angular resolution of the Very Large Telescope Interferometer (VLTI) and the excellent sensitivity of GRAVITY have led to the first detection of spatially resolved kinematics of high velocity atomic gas near an accreting super- massive…
View article: Spatially Resolved Accretion-Ejection in Compact Binaries with GRAVITY
Spatially Resolved Accretion-Ejection in Compact Binaries with GRAVITY Open
The GRAVITY instrument at the Very Large Telescope Interferometer has led to the first spatially resolved observations of X-ray binaries at scales comparable to the binary orbit, providing unprecedented spatial information on their accreti…