M. Benisty
A5081520912- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Molecular Spectroscopy and Structure
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Space Exploration and Technology
- Calibration and Measurement Techniques
- Gamma-ray bursts and supernovae
- Phase Equilibria and Thermodynamics
- Geophysics and Gravity Measurements
- Advanced optical system design
- Pulsars and Gravitational Waves Research
- Spacecraft and Cryogenic Technologies
- Thermodynamic properties of mixtures
- Advanced Fiber Laser Technologies
- Bee Products Chemical Analysis
- Particle Accelerators and Free-Electron Lasers
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
Max Planck Institute for Astronomy
2010-2025
Institut de Planétologie et d'Astrophysique de Grenoble
2015-2024
Observatoire de la Côte d’Azur
2022-2024
Université Côte d'Azur
2022-2024
Centre National de la Recherche Scientifique
2015-2024
Université Grenoble Alpes
2015-2024
Lagrange Laboratory
2024
University of Chile
2017-2023
IPAG Business School
2023
Universidad Bernardo O'Higgins
2019-2022
We introduce the Disk Substructures at High Angular Resolution Project (DSHARP), one of initial Large Programs conducted with Atacama Millimeter/submillimeter Array (ALMA). The primary goal DSHARP is to find and characterize substructures in spatial distributions solid particles for a sample 20 nearby protoplanetary disks, using very high resolution (0.035 arcsec, or 5 au FWHM) observations their 240 GHz (1.25 mm) continuum emission. These data provide first homogeneous look small-scale...
The highly elliptical, 16-year-period orbit of the star S2 around massive black hole candidate Sgr A ✻ is a sensitive probe gravitational field in Galactic centre. Near pericentre at 120 AU ≈ 1400 Schwarzschild radii, has an orbital speed ≈7650 km s −1 , such that first-order effects Special and General Relativity have now become detectable with current capabilities. Over past 26 years, we monitored radial velocity motion on sky S2, mainly SINFONI NACO adaptive optics instruments ESO Very...
GRAVITY is a new instrument to coherently combine the light of European Southern Observatory Very Large Telescope Interferometer form telescope with an equivalent 130 m diameter angular resolution and collecting area 200 m$^2$. The comprises fiber fed integrated optics beam combination, high spectroscopy, built-in analysis control, near-infrared wavefront sensing, phase-tracking, dual operation laser metrology [...]. This article gives overview reports on performance first astronomical...
Abstract The Disk Substructures at High Angular Resolution Project (DSHARP) used ALMA to map the 1.25 mm continuum of protoplanetary disks a spatial resolution ∼5 au. We present systematic analysis annular substructures in 18 single-disk systems targeted this survey. No dominant architecture emerges from sample; instead, remarkably diverse morphologies are observed. Annular can occur virtually any radius where millimeter emission is detected and range widths few astronomical units tens...
Abstract The Disk Substructures at High Angular Resolution Project (DSHARP) provides a large sample of protoplanetary disks with substructures that could be induced by young forming planets. To explore the properties planets may responsible for these substructures, we systematically carry out grid 2D hydrodynamical simulations, including both gas and dust components. We present resulting structures, relationship between planet mass, as well (1) gaseous gap depth/width (2) sub/super-Keplerian...
Context. PIONIER stands for Precision Integrated-Optics Near-infrared Imaging ExpeRiment. It combines four 1.8m Auxilliary Telescopes or 8m Unit of the Very Large Telescope Interferometer (ESO, Chile) using an integrated optics combiner. The instrument was at IPAG in December 2009 and commissioned Paranal Observatory October 2010. has provided scientific observations since November
A large fraction of the protoplanetary disks observed with ALMA display multiple well-defined and nearly perfectly circular rings in continuum, many cases substantial peak-to-valley contrast. The DSHARP campaign shows that several these are very narrow radial extent. In this paper we test hypothesis dust caused by trapping pressure bumps, if confirmed, put constraints on physics mechanism. We model process analytically 1D, assuming axisymmetry. By comparing to data, find all consistent...
The study of dynamical processes in protoplanetary disks is essential to understand planet formation. In this context, transition are prime targets because they at an advanced stage disk clearing and may harbor direct signatures evolution. paper, we aim derive new constraints on the structure MWC 758, detect non-axisymmetric features their origin. We obtained infrared polarized intensity observations 758 with SPHERE/VLT 1.04 microns resolve scattered light a smaller inner working angle...
Abstract We present the first part of our Disks ARound T Tauri Stars with SPHERE (DARTTS-S) survey: observations eight stars that were selected based on their strong (sub)millimeter excesses using SPHERE/IRDIS polarimetric differential imaging in J and H bands. All successfully detect disks, which appear vastly different size, from ≈80 au scattered light to >400 au, display total polarized disk fluxes between 0.06% 0.89% stellar flux. For five these we are able determine three-dimensional...
Young circumstellar disks are of prime interest to understand the physical and chemical conditions under which planet formation takes place. Only very few detections candidates within these exist, most them currently suspected be disk features. In this context, transition around young star PDS 70 is particular interest, due its large gap identified in previous observations, indicative ongoing formation. We aim search for presence planets structures disk-planet interactions other evolutionary...
Context. Transition disks are believed to be the final stages of protoplanetary disks, during which a forming planetary system or photoevaporation processes open gap in inner disk, drastically changing disk structure. From theoretical arguments it is expected that dust growth, fragmentation and radial drift strongly influenced by gas structure, pressure bumps have been suggested as key features may allow grains converge grow efficiently.
Aims: We aim to characterize the orbital and atmospheric properties of PDS 70 b, which was first identified on May 2015 in course SHINE survey with SPHERE, extreme adaptive-optics instrument at VLT. Methods: obtained new deep SPHERE/IRDIS imaging SPHERE/IFS spectroscopic observations b. The astrometric baseline now covers 6 years allows us perform an analysis. For time, we present spectrophotometry young planet almost entire near-infrared range (0.96 3.8 micrometer). use different models...
Abstract High dust density in the midplane of protoplanetary disks is favorable for efficient grain growth and can allow fast formation planetesimals planets, before dissipate. Vertical settling trapping pressure maxima are two mechanisms allowing to concentrate geometrically thin high-density regions. In this work, we aim study these highly inclined disk SSTC2D J163131.2-242627 (Oph 163131, i ∼ 84°). We present new high-angular-resolution continuum 12 CO ALMA observations Oph 163131. The...
With the uniquely high contrast within 01 (Δmag(L') = 5–6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in flux from Herbig Fe star HD 142527 a barycenter emission situated projected separation of 88 ± 5 mas (12.8 1.5 AU 145 pc) and ratios H, K, L' 0.016 0.007, 0.012 0.008, 0.0086 0.0011, respectively (3σ errors), relative to primary disk. After extensive closure-phase modeling, interpret this detection as close-in, low-mass stellar...
Context. The protoplanetary disk around the F-type star HD 135344B (SAO 206462) is in a transition stage and shows many intriguing structures both scattered light thermal (sub-)millimeter emission which are possibly related to planet formation processes.
We measured the radii of 7 low and very low-mass stars using long baseline interferometry with VLTI interferometer its VINCI AMBER near-infrared recombiners. use these new data, together literature measurements, to examine luminosity- radius mass-radius relations for K M dwarfs. The precision interferometric now competes what can be obtained double-lined eclipsing binaries. Interferometry provides access much less active stars, as well better distances luminosities, therefore complements...
Understanding the diversity of planets requires to study morphology and physical conditions in protoplanetary disks which they form. We observed spatially resolved disk around ~10 Myr old HD 100453 polarized scattered light with SPHERE/VLT at optical near-infrared wavelengths, reaching an angular resolution ~0.02", inner working angle ~0.09". detect up ~0.42" (~48 au) a cavity, rim azimuthal brightness variations inclination 38 degrees, two shadows symmetric spiral arms. The arms originate...
Transitional disks (TDs) are thought to be a late evolutionary stage of protoplanetary with dust depleted inner regions. The mechanism responsible for this depletion is still under debate. To constrain the models it mandatory have good understanding properties gas content disk. Using X-Shooter broad band -UV NIR- medium resolution spectroscopy we derive stellar, accretion, and wind sample 22 TDs. analysis these allows us put strong constraints on in region very close star (<0.2 AU) which...
We analyze a sample of 12 HST-selected edge-on protoplanetary disks for which the vertical extent emission layers can be constrained directly. present ALMA high angular resolution continuum images (0.1arcsec) these at two wavelengths, 0.89mm and 2.06mm (respectively bands 7 4), supplemented with archival band 6 data (1.33mm) where available. For most sources, millimeter is more compact than scattered light, both in radial directions. Six sources are resolved along their minor axis least one...
We report the detection of a faint pointlike feature possibly related to ongoing planet-formation in disk transition star HD 169142. The has $\Delta$mag(L)$\sim$6.4, at separation $\sim$0.11" and PA$\sim$0$^{\circ}$. Given its lack an H or K$_{S}$ counterpart despite relative brightness, this candidate cannot be explained by purely photospheric emission must heated as yet unknown source. Its extremely red colors make it highly unlikely background object, but future multi-wavelength followup...
Abstract We present scattered light images of the TW Hya disk performed with Spectro-Polarimetric High-contrast Exoplanet REsearch instrument in Polarimetric Differential Imaging mode at 0.63, 0.79, 1.24, and 1.62 μ m. also H2/H3-band angular differential imaging (ADI) observations. Three distinct radial depressions polarized intensity distribution are seen, around ≈85, ≈21, ≲6 au. 21 The overall has a high degree azimuthal symmetry; is somewhat brighter than average toward south darker...
To date, infrared interferometry at best achieved contrast ratios of a few times $10^{-4}$ on bright targets. GRAVITY, with its dual-field mode, is now capable high observations, enabling the direct observation exoplanets. We demonstrate technique HR8799, young planetary system composed four known giant used GRAVITY fringe tracker to lock fringes central star, and integrated off-axis HR8799e planet situated 390 mas from star. Data reduction included post-processing remove flux leaking star...
Context. It is now generally accepted that the near-infrared excess of Herbig AeBe stars originates in dust a circumstellar disk. Aims. The aims this article are to infer radial and vertical structure these disks at scales order one au, properties grains. Methods. program objects (51 total) were observed with H-band (1.6micron) PIONIER/VLTI interferometer. largest baselines allowed us resolve (at least partially) structures few tenths an au typical distances hundred parsecs. Dedicated...
The variety of observed protoplanetary disks in polarimetric light motivates a taxonomical study to constrain their evolution and establish the current framework this type observations. We classified 58 with available observations into six major categories (Ring, Spiral, Giant, Rim, Faint, Small disks) based on appearance scattered light. re-calculated stellar disk properties from newly GAIA DR2 related these categories. More than half our sample shows sub-structures. For remaining sources,...