Jean-Loup Baudino
A5012191064- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Physics and Engineering Research Articles
- Spectroscopy and Laser Applications
- Atmospheric and Environmental Gas Dynamics
- Molecular Spectroscopy and Structure
- Cardiac Arrest and Resuscitation
- Geophysics and Gravity Measurements
- Chemical Thermodynamics and Molecular Structure
- Emergency and Acute Care Studies
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Gamma-ray bursts and supernovae
- Sepsis Diagnosis and Treatment
Observatoire de Paris
2013-2022
Centre National de la Recherche Scientifique
2013-2022
Sorbonne Université
2013-2022
Université Paris Sciences et Lettres
2015-2022
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2013-2022
Université Paris Cité
2013-2022
Université de Versailles Saint-Quentin-en-Yvelines
2013-2022
OBS Medical (United Kingdom)
2021
Sorbonne Paris Cité
2015-2020
Délégation Paris 7
2013-2020
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...
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...
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...
GJ758 B is a brown dwarf companion to nearby (15.76 pc) solar-type, metal-rich (M/H = +0.2 dex) main-sequence star (G9V) that was discovered with Subaru/HiCIAO in 2009. From previous studies, it has drawn attention as being the coldest (~600K) ever directly imaged around neighboring star. We present new high-contrast data obtained during commissioning of SPHERE instrument at VLT. The Y-, J-, H-, and Ks-bands dual-band imaging (DBI) mode IRDIS, providing broad coverage full near-infrared...
We aim to interpret future photometric and spectral measurements from these instruments, in terms of physical parameters the planets, with an atmospheric model using a minimal number assumptions parameters. developed Exoplanet Radiative-convective Equilibrium Model (Exo-REM) analyze spectro- scopic data directly imaged planets. The input are planet's surface gravity (g), effective temperature (Teff ), elemental composition. predicts equilibrium profile mixing ratio profiles most important...
Abstract Given the forthcoming launch of James Webb Space Telescope ( JWST ), which will allow observing exoplanet atmospheres with unprecedented signal-to-noise ratio, spectral coverage, and spatial resolution, uncertainties in atmosphere modeling used to interpret data need be assessed. As first step, we compare three independent 1D radiative-convective models: ATMO , Exo-REM petitCODE . We identify differences physical chemical processes that are taken into account thanks a benchmark...
Context. PDS 70 is a young (5.4 Myr), nearby (~113 pc) star hosting known transition disk with large gap. Recent observations SPHERE and NACO in the near-infrared (NIR) allowed us to detect planetary mass companion, PDS70b, within cavity. Moreover, H_alpha MagAO MUSE revealed emission associated PDS70b another new companion candidate, PDS70c, at larger separation from star. Aims. Our aim confirm discovery of second planet PDS70c using VLT, further characterize its physical properties, search...
The intermediate-mass star Beta Pictoris is known to be surrounded by a structured edge-on debris disk within which gas giant planet was discovered orbiting at 8-10 AU. physical properties of Pic b were previously inferred from broad and narrow-band 0.9-4.8 microns photometry. We used commissioning data the Gemini Planet Imager (GPI) obtain new astrometry low-resolution (R=35-39) J-band (1.12-1.35 microns) spectrum planet. find that has passed quadrature. constrain its semi-major axis $\leq$...
Context. The G-type star GJ504A is known to host a 3–35 M Jup companion whose temperature, mass, and projected separation all contribute making it test case for planet formation theories atmospheric models of giant planets light brown dwarfs. Aims. We aim at revisiting the system age, architecture, physical chemical properties using new complementary interferometric, radial-velocity, high-contrast imaging data. Methods. used CHARA interferometer measure GJ504A’s angular diameter obtained an...
We developed a simple, physical and self-consistent cloud model for brown dwarfs young giant exoplanets. compared different parametrisations the particle size, by either fixing radii, or mixing efficiency (parameter fsed) estimating radii from simple microphysics. The scheme with microphysics appears as best parametrisation successfully reproducing observed photometry spectra of In particular, it reproduces L-T transition, due to condensation silicate iron clouds below visible/near-IR...
Jets are rarely associated with pre-main-sequence intermediate-mass stars. Optical and near-IR observations of jet-driving sources often hindered by the presence a natal envelope. around partly embedded useful diagnostic to constrain geometry concealed protoplanetary disk. In fact, mechanisms affected both spatial anisotropies episodic variations at (sub-)au scale from star. We obtained rich set high-contrast VLT/SPHERE 0.6 micron 2.2 young star RY Tau. Given proximity Sun this source, our...
Context. High contrast imaging enables the determination of orbital parameters for substellar companions (planets, brown dwarfs) from observed relative astrometry and estimation model age-dependent masses their magnitudes or spectra. Combining astrometric positions with radial velocity gives direct constraints on orbit dynamical companions. A dwarf was discovered VLT/SPHERE instrument at Very Large Telescope (VLT) in 2017, which orbits ∼11 au around HD 206893. Its mass estimated between 12...
HD 95086 is an intermediate-mass debris-disk-bearing star. VLT/NaCo $3.8 μm$ observations revealed it hosts a $5\pm2 \mathrm{M}_{Jup}$ companion (HD b) at $\simeq 56$ AU. Follow-up 1.66 and 2.18 $μm$ yielded null detection, suggesting extremely red colors for the planet need deeper direct-imaging data. In this Letter, we report H- ($1.7 μm$) $\mathrm{K}_1$- ($2.05 band detections of b from Gemini Planet Imager (GPI) commissioning taken by GPI team. The position in both spectral channels...
With an orbital distance comparable to that of Saturn in the solar system, \bpic b is closest (semi-major axis $\simeq$\,9\,au) exoplanet has been imaged orbit a star. Thus it offers unique opportunities for detailed studies its orbital, physical, and atmospheric properties, disk-planet interactions. exception discovery observations 2003 with NaCo at Very Large Telescope (VLT), all following astrometric measurements relative have obtained southwestern part orbit, which severely limits...
The Mid-Infrared instrument (MIRI) on board the James Webb Space Telescope will perform first ever characterization of young giant exoplanets observed by direct imaging in 5-28 microns spectral range. This wavelength range is key for both determining bolometric luminosity cool known and accessing strongest ammonia bands. In conjunction with shorter observations, MIRI enable a more accurate exoplanetary atmospheric properties. Here we consider subsample currently detected discuss their...
Context. Detecting and characterizing substellar companions for which the luminosity, mass, age can be determined independently is of utter importance to test calibrate evolutionary models due uncertainties in their formation mechanisms. HD 19467 a bright nearby star hosting cool brown dwarf companion detected with RV imaging, making it valuable object such studies. Aims. We aim further characterize orbital, spectral, physical properties system. Methods. present new high-contrast imaging...
The study of high contrast imaged brown dwarfs and exoplanets depends strongly on evolutionary models. To estimate the mass a directly substellar object, its extracted photometry or spectrum is used adjusted with model spectra together estimated age system. These models still need to be properly tested constrained. HD 4747B dwarf close H burning limit, orbiting nearby, solar-type star has been observed radial velocity method over almost two decades now. Its companion was also recently...
Current observational data of exoplanets are providing increasing detail their 3D atmospheric structures. As characterisation efforts expand in scope, the need to develop consistent radiative-transfer methods becomes more pertinent as complex properties required be modelled together consistently. We aim compare transmission and emission spectra results a Monte Carlo Radiative Transfer (MCRT) model contemporary suites. perform several benchmarking tests MCRT code, Cloudy (CMCRT), output. add...
A large number of systems harboring a debris disk show evidence for double belt architecture. One hypothesis explaining the gap between belts is presence one or more planets dynamically carving it. This work aims to investigate this scenario in two components disks. All targets sample were observed with SPHERE instrument which performs high-contrast direct imaging. Positions inner and outer estimated by SED fitting infrared excesses or, when available, from resolved images disk. Very few...
Context. HD 72946 is a bright and nearby solar-type star hosting low-mass companion at long period ( P ∼ 16 yr) detected with the radial velocity (RV) method. The has minimum mass of 60.4 ± 2.2 M J might be brown dwarf. Its expected semi-major axis ∼243 mas makes it suitable target for further characterization high-contrast imaging, in particular to measure its inclination, mass, spectrum thus definitely establish substellar nature. Aims. We aim characterize orbit, atmosphere, physical...
HR2562 is an F5V star located at ~33 pc from the Sun hosting a substellar companion that was discovered using GPI instrument. The main objective of present paper to provide extensive characterisation companion, by deriving its fundamental properties. We observed HR 2562 with near-infrared branch (IFS and IRDIS) SPHERE VLT. During our observations IFS operating in YJ band, while IRDIS observing $H$ broad-band filter. data were reduced dedicated GTO pipeline, which custom-designed for this On...
We sought to evaluate if incorporating an early warning system (EWS), the Visensia Safety Index (VSI) and National Early Warning Systems 2 (NEWS2), may lead earlier identification of rapid response team (RRT) patients.This was a retrospective study (2015-2018) patients experiencing RRT activation within tertiary care network. evaluated proportion with EWS alert prior their associated outcomes (primary: hospital mortality).There were 6,346 activations over period. Of these, 2042 (50.8%) would...