Patrick Rabou
A5060826866- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Optical Systems and Laser Technology
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Advanced optical system design
- Solar and Space Plasma Dynamics
- Optical Wireless Communication Technologies
- Optical Coatings and Gratings
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Photocathodes and Microchannel Plates
- Geophysics and Sensor Technology
- Semiconductor Lasers and Optical Devices
- Optical measurement and interference techniques
- Photonic and Optical Devices
- Laser-Matter Interactions and Applications
- Advanced Semiconductor Detectors and Materials
- Molecular Spectroscopy and Structure
- Ionosphere and magnetosphere dynamics
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
Institut de Planétologie et d'Astrophysique de Grenoble
2011-2024
Université Grenoble Alpes
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire d’Astrophysique de Marseille
2022
University of Oxford
2020-2022
Observatoire des sciences de l'Univers Paris-Saclay
2016-2018
IPAG Business School
2016-2018
Observatoire des Sciences de l'Univers de Grenoble
2016-2018
Max Planck Institute for Astronomy
2018
Max Planck Society
2018
Since the discovery of its dusty disk in 1984, Beta Pictoris has become prototype young early-type planetary systems, and there are now various indications that a massive Jovian planet is orbiting star at ~ 10 AU. However, no planets have been detected around this so far. Our goal was to investigate close environment Pic, searching for companion(s). Deep adaptive-optics L'-band images Pic were recorded using NaCo instrument Very Large Telescope. A faint point-like signal projected distance 8...
Direct detection and spectral characterization of extra-solar planets is one the most exciting but also challenging areas in modern astronomy. The challenge consists very large contrast between host star planet, larger than 12.5 magnitudes at small angular separations, typically inside seeing halo. whole design a "Planet Finder" instrument therefore optimized towards reaching highest limited field view short distances from central star. Both evolved young planetary systems can be detected,...
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
Observations of circumstellar environments to look for the direct signal exoplanets and scattered light from disks has significant instrumental implications. In past 15 years, major developments in adaptive optics, coronagraphy, optical manufacturing, wavefront sensing data processing, together with a consistent global system analysis have enabled new generation high-contrast imagers spectrographs on large ground-based telescopes much better performance. One most productive is...
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...
NAOS is the first adaptive optics system installed at VLT 8m telescopes. It was designed, manufactured and tested by a french Consortium under an ESO contract, to provide compensated images high angular resolution IR spectro-imaging camera (CONICA) in 1 5 μ<i>m</i> spectral range. equipped with 185 actuator deformable mirror, tip/tilt mirror two wavefront sensors, one visible near has been November Nasmyth focus B of UT4. During light run December 2001, delivered Strehl ratio 50 average...
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...
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...
ABSTRACT This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter/precision velocimeter recently installed on 3.6-m Canada–France–Hawaii Telescope (CFHT). Starting from two main science goals, i.e., quest for planetary systems around nearby M dwarfs and study magnetized star/planet formation, we outline instrument concept that was designed to efficiently address these forefront topics, detail in-lab on-sky performances measured throughout intensive...
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...
Context. Polarimetric imaging is one of the most effective techniques for high-contrast and characterization protoplanetary disks, it has potential becoming instrumental in exoplanets. The Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument installed on Very Large Telescope (VLT) contains InfraRed Dual-band Imager Spectrograph (IRDIS) with a dual-beam polarimetric (DPI) mode, which offers capability obtaining linear polarization images at high contrast resolution. Aims....
SPIRou is a near-IR \'echelle spectropolarimeter and high-precision velocimeter under construction as next-generation instrument for the Canada-France-Hawaii-Telescope. It designed to cover very wide simultaneous spectral range (0.98-2.35 {\mu}m) at resolving power of 73.5K, providing unpolarized polarized spectra low-mass stars radial velocity (RV) precision 1m/s. The main science goals are detection habitable super-Earths around study how critically magnetic fields impact star / planet...
Context. Large surveys with new-generation high-contrast imaging instruments are needed to derive the frequency and properties of exoplanet populations separations from ~5 300 au. A careful assessment stellar is crucial for a proper understanding when, where, how frequently planets form, they evolve. The sensitivity detection limits age makes this key parameter direct surveys. Aims. We describe SpHere INfrared survey Exoplanets (SHINE), largest planet-search campaign initiated at VLT in 2015...
HD~106906AB is so far the only young binary system around which a planet has been imaged and debris disk evidenced thanks to strong IR excess. As such, it represents unique opportunity study dynamics of planetary systems. We aim at further investigating close (tens au scales) environment system. used extreme AO fed, high contrast imager SPHERE recently installed on VLT observe HD~106906. Both IRDIS Integral Field Spectrometer were used. discovered very inclined, ring-like distance 65~au from...
Context. Multi-wavelength observations are indispensable in studying disk geometry and dust evolution processes protoplanetary disks. Aims. We aimed to construct a 3-dimensional model of HD 163296 capable reproducing simultaneously new the surface scattered light with SPHERE instrument thermal emission continuum midplane ALMA. want determine why SED is intermediary between otherwise well-separated group I II Herbig stars. Methods. The was modelled using Monte Carlo radiative transfer code...
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...
A large fraction of stars is found to be part binary or higher-order multiple systems. The ubiquity planets around single raises the question if and how in systems may form. Protoplanetary disks are birthplaces planets, their characterization crucial order understand planet formation process. Our aim characterize morphology GG Tau disk, one largest most massive circumbinary disks, trace evidence for binary-disk interactions. We obtained observations polarized scattered light using...
We present in this paper the technical characteristics of a new polarimetric unit dedicated to MuSiCoS échelle spectrograph. The first test runs indicate that our instrument is very good at measuring polarisation or depolarisation structures line profiles. It therefore one few facilities worldwide for studying magnetic topologies active and chemically peculiar stars through rotational modulation linearly circularly polarised Zeeman signatures also interesting tool investigating geometries...
Presently, dedicated instruments at large telescopes (SPHERE for the VLT, GPI Gemini) are about to discover and explore self-luminous giant planets by direct imaging spectroscopy. The next generation of 30m-40m ground-based telescopes, Extremely Large Telescopes (ELTs), have potential dramatically enlarge discovery space towards older seen in reflected light ultimately even a small number rocky planets. EPICS is proposed instrument European ELT, detection characterization Exoplanets imaging,...
Context. The next generation of exoplanet hunters will be targeting hot Jupiter-like exoplanets orbiting around nearby stars through direct imaging. high contrast needed for such planet finders requires optical surfaces free spatial frequency ripples that might remain in the post-coronagraphic image as quasi-static speckles.
We have developed a spectrogonio radiometer to measure in the laboratory (-35 degrees C +30 C) bidirectional reflectance and polarization distribution functions of various types planetary material from UV near-IR (310-4800 nm). The major, our knowledge, novel feature this instrument is that it capable measuring dark translucent materials with high degree radiometric accuracy under most viewing geometries. sample surface illuminated large monochromatic polarized parallel beam (incidence: 0...