Explanipedia

Force-responsive symmetric cell divisions orient stomata along global tissue axes Open

B. López, Moritz Goetz, Andrew Muroyama · 2025

Stomata, microscopic pores that regulate gas exchange in plants, are patterned according to conserved pathways that regulate their physiology. Here, we identify a new mode of stomatal patterning that depends on previously unrecognized regu…

Spatially resolved broad line region in a quasar at z=4: Dynamical black hole mass and prominent outflow Open

GRAVITY Collaboration, Karim El Dayem, N. Aimar, Anthony Berdeu, Jean-Philippe Berger , et al. · 2025

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 …

La Ética de lo Singular en un proceso de Investigación Social Open

B. López · 2025

La ética como principio organizador y directivo de una práctica investigativa se encuentra sujeta a paradigmas científicos o a teorías que bordean de manera específica el objeto de estudio. En esta dirección, el método científico prioriza …

Circumstellar emission of Cepheids across the instability strip: Mid-infrared observations with VLTI/MATISSE Open

V. Hocdef, Albert Matter, N. Nardetto, A. Gallenne, P. Kervella , et al. · 2025

Context. The circumstellar envelopes (CSE) of Cepheids are still only poorly characterized despite their potential impact on the distance determination via both the period-luminosity relation and the parallax-of-pulsation method. Aims. Thi…

Tuning the CMS Coffea-casa facility for 200 Gbps Challenge Open

Sam Albin, Garhan Attebury, K. Bloom, Brian Bockelman, B. López , et al. · 2025

As a part of the IRIS-HEP “Analysis Grand Challenge” activities, the Coffea-casa AF team executed a “200 Gbps Challenge”. One of the goals of this challenge was to provide a setup for execution of a test notebook-style analysis on the faci…

An impressionist view of V Hydrae Open

L. Planquart, C. Paladini, A. Jorissen, A. Escorza, E. Pantin , et al. · 2024

Context. Asymptotic giant branch (AGB) stars enrich the interstellar medium through their mass loss. The mechanism(s) shaping the circumstellar environment of mass-losing stars is not clearly understood so far. Aims. Our purpose is to stud…

An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs Open

L. Planquart, C. Paladini, A. Jorissen, A. Escorza, E. Pantin , et al. · 2024

Our purpose is to study the effect of binary companions located within the first 10 stellar radii from the primary AGB star. In this work, we target the mass-losing carbon star V Hydrae (V Hya), looking for signatures of its companion in t…

Chromatically modeling the parsec-scale dusty structure in the center of NGC 1068 Open

J. Leftley, R. Petrov, N. Moszczynski, P. Vermot, S. F. Hönig , et al. · 2024

Context. The Very Large Telescope Interferometer (VLTI) has been providing breakthrough images of the dust in the central parsecs of active galactic nuclei (AGNs), which is thought to be a key component of the AGN unification scheme and AG…

A dynamical measure of the black hole mass in a quasar 11 billion years ago Open

R. Abuter, Fatmé Allouche, A. Amorim, C. Bailet, Anthony Berdeu , et al. · 2024

Mid-infrared evidence for iron-rich dust in the multi-ringed inner disk of HD 144432 Open

J. Varga, L. B. F. M. Waters, M. R. Hogerheijde, R. van Boekel, A. Matter , et al. · 2023

Context. Rocky planets form by the concentration of solid particles in the inner few au regions of planet-forming disks. Their chemical composition reflects the materials in the disk available in the solid phase at the time the planets wer…

Images of Betelgeuse with VLTI/MATISSE across the Great Dimming Open

J. Drevon, F. Millour, P. Cruzalèbes, C. Paladini, Peter Scicluna , et al. · 2023

From Nov. 2019 to May 2020, the red supergiant star Betelgeuse experienced an unprecedented drop of brightness in the visible domain called the Great Dimming event (GDE). Large atmospheric dust clouds and large photospheric convective feat…

Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE Open

J. Drevon, F. Millour, P. Cruzalèbes, C. Paladini, J. Hron , et al. · 2022

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…

The disk of FU Orionis viewed with MATISSE/VLTI Open

Foteini Lykou, P. Ábrahám, L. Chen, J. Varga, Á. Kóspál , et al. · 2022

Aims. We studied the accretion disk of the archetypal eruptive young star FU Orionis with the use of mid-infrared interferometry, which enabled us to resolve the innermost regions of the disk down to a spatial resolution of 3 milliarcsecon…

MATISSE, the VLTI mid-infrared imaging spectro-interferometer Open

B. López, S. Lagarde, R. Petrov, W. Jaffe, J.‐C. Augereau , et al. · 2022

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…

The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE Open

A. Chiavassa, Kateryna Kravchenko, M. Montargès, F. Millour, A. Matter , et al. · 2021

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…

VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris Open

K.-H. Hofmann, A. Bensberg, D. Schertl, G. Weigelt, S. Wolf , et al. · 2021

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…

VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris Open

K.-H. Hofmann, A. Bensberg, D. Schertl, G. Weigelt, S. Wolf , et al. · 2021

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…

VLTI-MATISSE chromatic aperture-synthesis imaging of η Carinae’s stellar wind across the Brα line Open

G. Weigelt, K.-H. Hofmann, D. Schertl, B. López, R. Petrov , et al. · 2021

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…

First MATISSE L-band observations of HD 179218 Open

Е. С. Кокоулина, A. Matter, B. López, E. Pantin, N. Ysard , et al. · 2021

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…

A dusty veil shading Betelgeuse during its Great Dimming Open

M. Montargès, Emily Cannon, E. Lagadec, A. de Koter, P. Kervella , et al. · 2021

Spatially resolving the chemical composition of the planet building blocks Open

A. Matter, F. C. Pignatale, B. López · 2020

The inner regions of protoplanetary discs (from ∼0.1 to 10 au) are the expected birthplace of planets, especially telluric. In those high-temperature regions, solids can experience cyclical annealing, vapourisation, and recondensation. Hot…

Evidence of a discontinuous disk structure around the Herbig Ae star HD 139614 (Corrigendum) Open

A. Matter, Lucas Labadie, Alexander Kreplin, B. López, S. Wolf , et al. · 2019

International audience

A catalogue of stellar diameters and fluxes for mid-infrared interferometry★ Open

P. Cruzalèbes, R. Petrov, S. Robbe-Dubois, J. Varga, L. Burtscher , et al. · 2019

We present the Mid-infrared stellar Diameters and Fluxes compilation Catalogue (MDFC) dedicated to long-baseline interferometry at mid-infrared wavelengths (3–13 $\mu$m). It gathers data for half a million stars, i.e. nearly all the stars …

NAOMI: the adaptive optics system of the Auxiliary Telescopes of the VLTI Open

J. Woillez, J.-A. Abad, R. Abuter, E. Aller Carpentier, Jaime Alonso , et al. · 2019

\nContext. The tip-tilt stabilisation system of the 1.8 m Auxiliary Telescopes of the Very Large Telescope Interferometer was never dimensioned for robust fringe tracking, except when atmospheric seeing conditions are excellent.\nAims. Inc…

VLTI/MIDI atlas of disks around low- and intermediate-mass young stellar objects Open

J. Varga, P. Ábrahám, L. Chen, T. Ratzka, K. É. Gabányi , et al. · 2018

\nContext. Protoplanetary disks show large diversity regarding their morphology and dust composition. With mid-infrared interferometry the thermal emission of disks can be spatially resolved, and the distribution and properties of the dust…

SPHERE view of Wolf-Rayet 104 Open

A. Soulain, F. Millour, B. López, Albert Matter, E. Lagadec , et al. · 2018

Context. WR104 is an emblematic dusty Wolf-Rayet star and the prototypical member of a sub-group hosting spirals that are mainly observable with high-angular resolution techniques. Previous aperture masking observations showed that WR104 i…

On the inner disc structure of MWC480: evidence for asymmetries? Open

N. Jamialahmadi, B. López, P. Berio, A. Matter, S. Flament , et al. · 2017

Studying the physical conditions structuring the young circumstellar disks is\nrequired for understanding the onset of planet formation. Of particular\ninterest is the protoplanetary disk surrounding the Herbig star MWC480. The\nstructure …

MATISSE: specifications and expected performances Open

A. Matter, S. Lagarde, R. Petrov, P. Berio, S. Robbe-Dubois , et al. · 2016

MATISSE (Multi AperTure mid-Infrared SpectroScopic Experiment) is the next generation spectro-interferometer at the European Southern Observatory VLTI operating in the spectral bands L, M and N, and combining four beams from the unit and a…

Grown-up stars physics with MATISSE Open

F. Millour, J. Hron, A. Chiavassa, G. Weigelt, A. Soulain , et al. · 2016

MATISSE represents a great opportunity to image the environment around massive and evolved stars. This will allow one to put constraints on the circumstellar structure, on the mass ejection of dust and its reorganization, and on the dust-n…

Data reduction for the MATISSE instrument Open

F. Millour, P. Bério, M. Heininger, Karl H. Hofmann, D. Schertl , et al. · 2016

We present in this paper the general formalism and data processing steps used\nin the MATISSE data reduction software, as it has been developed by the MATISSE\nconsortium. The MATISSE instrument is the mid-infrared new generation\ninterfer…

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