M. Bonnefoy
A5091569651- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Calibration and Measurement Techniques
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Molecular Spectroscopy and Structure
- Electron and X-Ray Spectroscopy Techniques
- Atmospheric Ozone and Climate
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Laser Applications
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Advanced Chemical Physics Studies
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Scientific Measurement and Uncertainty Evaluation
- Astronomical and nuclear sciences
- Solar and Space Plasma Dynamics
Institut de Planétologie et d'Astrophysique de Grenoble
2015-2024
Université Grenoble Alpes
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Max Planck Institute for Astronomy
2011-2022
Université Claude Bernard Lyon 1
2022
IPAG Business School
2014-2022
Max Planck Society
2012-2019
Dublin Institute For Advanced Studies
2019
EarthTech International (United States)
2019
Arcetri Astrophysical Observatory
2019
Here we show that the ~10 Myr Beta Pictoris system hosts a massive giant planet, b, located 8 to 15 AU from star. This result confirms gas planets form rapidly within disks and validates use of disk structures as fingerprints embedded planets. Among few already imaged, b is closest its parent Its short period could allow recording full orbit 17 years.
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...
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...
The SHINE program is a large high-contrast near-infrared survey of 600 young, nearby stars. It aimed at searching for and characterizing new planetary systems using VLT/SPHERE's unprecedented high-angular resolution imaging capabilities. also intends placing statistical constraints on the occurrence orbital properties giant planet population orbits as function stellar host mass age to test formation theories. We use IRDIS dual-band imager IFS integral field spectrograph SPHERE acquire...
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...
We present the first near-IR scattered light detection of transitional disk associated with Herbig Ae star MWC 758 using data obtained as part Strategic Exploration Exoplanets and Disks Subaru, 1.1 micron HST/NICMOS data. While sub-millimeter studies suggested there is a dust-depleted cavity r=0.35, we find close 0.1 (20-28 AU) from star, no visible at H, K', or Ks. two small-scaled spiral structures which asymmetrically shadow outer disk. model one spirals density wave theory, derive aspect...
We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is $<$20 M$_\mathrm{Jup}$ widely separated ($\sim$8\arcsec, = 150 au), young, companion that shares photometric colors and spectroscopic features with directly imaged exoplanets HR 8799 c, d, e. As an L-to-T transition object, exists along region color-magnitude diagram where substellar atmospheres from cloudy clear. observed 1256~b \textit{JWST}'s NIRSpec IFU MIRI MRS modes for coverage 1 $\mu$m 20 at...
We present JWST Early Release Science (ERS) coronagraphic observations of the super-Jupiter exoplanet, HIP 65426 b, with Near-Infrared Camera (NIRCam) from 2-5 $\mu$m, and Mid-Infrared Instrument (MIRI) 11-16 $\mu$m. At a separation $\sim$0.82" (86$^{+116}_{-31}$ au), b is clearly detected in all seven our observational filters, representing first images an exoplanet to be obtained by JWST, ever direct detection beyond 5 These demonstrate that exceeding its nominal predicted performance up...
<i>Context. <i/>High contrast and high angular resolution imaging is the optimal search technique for substellar companions to nearby stars at physical separations larger than typically 10 AU. Two distinct populations of companions, brown dwarfs planets, can be probed characterized. As a result, fossile traces processes formation evolution revealed by orbital properties, both individual systems as an ensemble.<i>Aims. <i/>Since November 2002, we have conducted large, deep imaging, survey...
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...
We present the direct imaging discovery of an extrasolar planet, or possible low-mass brown dwarf, at a projected separation 55 +/- 2 AU (1.058 0.007 arcsec) from B9-type star Kappa And. The planet was detected with Subaru/HiCIAO during SEEDS survey, and confirmed as bound companion via common proper motion measurements. Observed near-infrared magnitudes J = 16.3 0.3, H 15.2 0.2, Ks 14.6 0.4, L' 13.12 0.09 indicate temperature ~1700 K. galactic kinematics host are consistent membership in...
Direct imaging of circumstellar disks requires high-contrast and high-resolution techniques. The angular differential (ADI) technique is one them, initially developed for point-like sources but now increasingly applied to extended objects. This new field application raises many questions because the disk images reduced with ADI depend strongly on amplitude rotation data reduction strategy. Both them directly affect observable properties. Our aim characterize applicability biases some...
Direct imaging has just started the inventory of population gas giant planets on wide-orbits around young stars in solar neighborhood. Following this approach, we carried out a deep survey near-infrared using VLT/NaCo to search for substellar companions. We report here discovery L' (3.8 microns) images probable companion orbiting at 56 AU (10-17 Myr), dusty, and early-type (A8) star HD 95086. This is based observations with more than year-time-lapse. Our first epoch clearly revealed source...
In June 2010, we confirmed the existence of a giant planet in disk young star Beta Pictoris, located between 8 AU and 15 from star. This offers rare opportunity to monitor large fraction orbit using imaging technique over reasonably short timescale. Using NAOS-CONICA adaptive-optics instrument (NACO) at Very Large Telescope (VLT), obtained repeated follow-up images Bpic system Ks L' filters four new epochs 2010 2011. Complementing these data with previous measurements, conduct homogeneous...
The planetary system discovered around the young A-type HR8799 provides a unique laboratory to: a) test planet formation theories, b) probe diversity of architectures at these separations, and c) perform comparative (exo)planetology. We present exploit new near-infrared images integral-field spectra four gas giants surrounding obtained with SPHERE, finder instrument Very Large Telescope, during commissioning science verification phase (July-December 2014). With data, we contribute to...
A gas giant planet has previously been directly seen orbiting at 8-10 AU within the debris disk of ~12 Myr old star {\beta} Pictoris. The Pictoris system offers rare opportunity to study physical and atmospheric properties an exoplanet placed on a wide orbit establish its formation scenario. We obtained J (1.265 {\mu}m), H (1.66 M' (4.78 {\mu}m) band angular differential imaging between 2011 2012. detect planetary companion in our four-epoch observations. estimate = 14.0 +- 0.3, 13.5 0.2,...
We present a library of near-infrared (1.1-2.45 microns) medium-resolution (R~1500-2000) integral field spectra 15 young M6-L0 dwarfs, composed companions with known ages and isolated objects. use it to (re)derive the NIR spectral types, luminosities physical parameters targets, test (BT-SETTL, DRIFT-PHOENIX) atmospheric models. derive infrared types L0+-1, M9.5+-0.5, M9.25+-0.25, M8+0.5-0.75, M8.5+-0.5 for AB Pic b, Cha J110913-773444, USco CTIO 108B, GSC 08047-00232 B, DH Tau CT HR7329B,...
51 Eridani b is an exoplanet around a young (20 Myr) nearby (29.4 pc) F0-type star, recently discovered by direct imaging. Being only 0.5" away from its host star it well suited for spectroscopic analysis using integral field spectrographs. We aim to refine the atmospheric properties of this and further constrain architecture system searching additional companions. Using SPHERE instrument at VLT we extend spectral coverage planet complete Y- H-band range provide photometry in K12-bands...
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...
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...
We present the performance of Integral Field Spectrograph (IFS) SPHERE, high-contrast imager for ESO VLT telescope designed to perform imaging and spectroscopy extrasolar planets, obtained from tests performed at Institute de Plan\'etologie et d'Astrophysique Grenoble facility during integration phase instrument.} {The were using instrument software purposely prepared SPHERE. The output data reduced applying SPHERE reduction handling software, adding an improved spectral deconvolution...
The system of four planets around HR8799 offers a unique opportunity to probe the physics and chemistry at play in atmospheres self-luminous young (~30 Myr) planets. We recently obtained new photometry low-resolution (R~30) spectra d e with SPHERE instrument (paper III). In this paper IV), we compare available known objects atmospheric models (BT-SETTL14, Cloud-AE60, Exo-REM) characterize properties find that HR8799d are well reproduced by those L6-L8 dusty dwarfs discovered field, among...