Daniel Rouan
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View article: GATOS. VIII. On the Physical Origin of the Extended Mid-infrared Emission in Active Galactic Nuclei
GATOS. VIII. On the Physical Origin of the Extended Mid-infrared Emission in Active Galactic Nuclei Open
The polar mid-infrared (MIR) emission detected within tens to hundreds of parsecs in some active galactic nuclei (AGN) has been associated with dusty winds driven away by radiation pressure. The physical characterization of this extended p…
View article: Evidence for SiO cloud nucleation in the rogue planet PSO J318
Evidence for SiO cloud nucleation in the rogue planet PSO J318 Open
Silicate clouds have long been known to significantly impact the spectra of late L-type brown dwarfs – with observable absorption features at ~10 μm. The James Webb Space Telescope (JWST) has reopened a window to the mid-infrared with unpr…
View article: Evidence for a sub-Jovian planet in the young TWA 7 disk
Evidence for a sub-Jovian planet in the young TWA 7 disk Open
Planets are thought to form from dust and gas in protoplanetary disks, with debris disks being the remnants of planet formation. Aged a few million up to a few billion years, debris disks have lost their primordial gas, and their dust is p…
View article: MIRI-JWST mid-infrared direct imaging of the debris disk of HD 106906
MIRI-JWST mid-infrared direct imaging of the debris disk of HD 106906 Open
Context . We report MIRI-JWST coronagraphic observations at 11.3 and 15.5 μm of the debris disk around the young star HD 106906. The wavelength range is sensitive to the thermal emission of the dust heated by the central star. Aims . The o…
View article: MIRI-LRS Spectrum of a Cold Exoplanet around a White Dwarf: Water, Ammonia, and Methane Measurements
MIRI-LRS Spectrum of a Cold Exoplanet around a White Dwarf: Water, Ammonia, and Methane Measurements Open
The study of the atmosphere of exoplanets orbiting white dwarfs is a largely unexplored field. With WD 0806-661 b, we present the first deep dive into the atmospheric physics and chemistry of a cold exoplanet around a white dwarf. We obser…
View article: HCN and C<sub>2</sub>H<sub>2</sub> in the Atmosphere of a T8.5+T9 Brown Dwarf Binary
HCN and C<sub>2</sub>H<sub>2</sub> in the Atmosphere of a T8.5+T9 Brown Dwarf Binary Open
T-type brown dwarfs present an opportunity to explore atmospheres teeming with molecules such as H 2 O, CH 4 , and NH 3 , which exhibit a wealth of absorption features in the mid-infrared. With JWST, we can finally explore this chemistry i…
View article: HCN and C2H2 in the atmosphere of a T8.5+T9 brown dwarf binary
HCN and C2H2 in the atmosphere of a T8.5+T9 brown dwarf binary Open
T-type brown dwarfs present an opportunity to explore atmospheres teeming with molecules such as H2O, CH4 and NH3, which exhibit a wealth of absorption features in the mid-infrared. With JWST, we can finally explore this chemistry in detai…
View article: First unambiguous detection of ammonia in the atmosphere of a planetary mass companion with JWST/MIRI coronagraphs
First unambiguous detection of ammonia in the atmosphere of a planetary mass companion with JWST/MIRI coronagraphs Open
Context . The newly accessible mid-infrared (MIR) window offered by the James Webb Space Telescope (JWST) for exoplanet imaging is expected to provide valuable information to characterize their atmospheres. In particular, coronagraphs on b…
View article: First unambiguous detection of ammonia in the atmosphere of a planetary mass companion with JWST/MIRI coronagraphs
First unambiguous detection of ammonia in the atmosphere of a planetary mass companion with JWST/MIRI coronagraphs Open
The newly accessible mid-infrared (MIR) window offered by the James Webb Space Telescope (JWST) for exoplanet imaging is expected to provide valuable information to characterize their atmospheres. In particular, coronagraphs on board the J…
View article: Combined analysis of the 12.8 and 15 µm JWST/MIRI eclipse observations of TRAPPIST-1 b
Combined analysis of the 12.8 and 15 µm JWST/MIRI eclipse observations of TRAPPIST-1 b Open
International audience
View article: The Galaxy Activity, Torus, and Outflow Survey (GATOS)
The Galaxy Activity, Torus, and Outflow Survey (GATOS) Open
The detailed feeding and feedback mechanisms of active galactic nuclei (AGNs) are not yet well known. For low-luminosity AGNs, obscured AGNs, and late-type galaxies, the masses of their central black holes (BH) are difficult to determine p…
View article: Molecular gas stratification and disturbed kinematics in the Seyfert galaxy MCG-05-23-16 revealed by JWST and ALMA
Molecular gas stratification and disturbed kinematics in the Seyfert galaxy MCG-05-23-16 revealed by JWST and ALMA Open
Understanding the processes that drive the morphology and kinematics of molecular gas in galaxies is crucial for comprehending star formation and, ultimately, galaxy evolution. Using data from the Galactic Activity, Torus and Outflow Surve…
View article: Molecular gas stratification and disturbed kinematics in the Seyfert galaxy MCG-05-23-16 revealed by JWST and ALMA
Molecular gas stratification and disturbed kinematics in the Seyfert galaxy MCG-05-23-16 revealed by JWST and ALMA Open
Understanding the processes that drive the morphology and kinematics of molecular gas in galaxies is crucial for comprehending star formation and, ultimately, galaxy evolution. Using data obtained with the James Webb Space Telescope (JWST)…
View article: Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI
Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI Open
Mid-infrared imaging of exoplanets and disks is now possible with the coronagraphs of the MIRI on the JWST. This wavelength range unveils new features of young directly imaged systems and allows us to obtain new constraints for characteriz…
View article: Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI
Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI Open
Context . Mid-infrared imaging of exoplanets and disks is now possible with the coronographs of the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). This wavelength range unveils new features of young directly image…
View article: Direct imaging of exoplanets with JWST/MIRI
Direct imaging of exoplanets with JWST/MIRI Open
JWST has opened a completely new spectral range in the mid IR for the study of exoplanetary systems which promise to offer unprecedented results both in terms of characterization but also discovery space.  Two observing modes in MIRI …
View article: GATOS: missing molecular gas in the outflow of NGC 5728 revealed by JWST
GATOS: missing molecular gas in the outflow of NGC 5728 revealed by JWST Open
The ionisation cones of NGC 5728 have a deficit of molecular gas based on millimetre observations of CO (2-1) emission. Although photoionisation from the active nucleus may lead to suppression of this transition, warm molecular gas can sti…
View article: GATOS: missing molecular gas in the outflow of NGC5728 revealed by JWST
GATOS: missing molecular gas in the outflow of NGC5728 revealed by JWST Open
The ionisation cones of NGC5728 have a deficit of molecular gas based on millimetre observations of CO(2-1) emission. Although photoionisation from the active nucleus may lead to suppression of this transition, warm molecular gas can still…
View article: Imaging detection of the inner dust belt and the four exoplanets in the HR 8799 system with JWST’s MIRI coronagraph
Imaging detection of the inner dust belt and the four exoplanets in the HR 8799 system with JWST’s MIRI coronagraph Open
Context . The MIRI instrument on board JWST is now offering high-contrast imaging capacity at mid-IR wavelengths, thereby opening a completely new field of investigation for characterizing young exoplanetary systems. Aims . The multiplanet…
View article: Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 5728
Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 5728 Open
The superb image quality, stability, and sensitivity of JWST permit deconvolution techniques to be pursued with a fidelity unavailable to ground-based observations. We present an assessment of several deconvolution approaches to improve im…
View article: The size-luminosity relation of local active galactic nuclei from interferometric observations of the broad-line region
The size-luminosity relation of local active galactic nuclei from interferometric observations of the broad-line region Open
By using the GRAVITY instrument with the near-infrared (NIR) Very Large Telescope Interferometer (VLTI), the structure of the broad (emission-)line region (BLR) in active galactic nuclei (AGNs) can be spatially resolved, allowing the centr…
View article: The size-luminosity relation of local active galactic nuclei from interferometric observations of the broad-line region
The size-luminosity relation of local active galactic nuclei from interferometric observations of the broad-line region Open
By using the GRAVITY instrument with the near-infrared (NIR) Very Large Telescope Interferometer (VLTI), the structure of the broad (emission-)line region (BLR) in active galactic nuclei (AGNs) can be spatially resolved, allowing the centr…
View article: Deconvolution of JWST/MIRI Images: Applications to an AGN Model and GATOS Observations of NGC 5728
Deconvolution of JWST/MIRI Images: Applications to an AGN Model and GATOS Observations of NGC 5728 Open
The superb image quality, stability and sensitivity of the JWST permit deconvolution techniques to be pursued with a fidelity unavailable to ground-based observations. We present an assessment of several deconvolution approaches to improve…
View article: Combined analysis of the 12.8 and 15 microns JWST/MIRI eclipse observations of TRAPPIST-1 b
Combined analysis of the 12.8 and 15 microns JWST/MIRI eclipse observations of TRAPPIST-1 b Open
The first JWST/MIRI photometric observations of TRAPPIST-1 b allowed for the detection of the thermal emission of the planet at 15 μm, suggesting that the planet could be a bare rock with a zero albedo and no redistribution of heat. Here w…
View article: The Galaxy Activity, Torus, and Outflow Survey (GATOS)
The Galaxy Activity, Torus, and Outflow Survey (GATOS) Open
We use JWST/MIRI MRS spectroscopy of a sample of six local obscured type 1.9/2 active galactic nuclei (AGN) to compare their nuclear mid-IR absorption bands with the level of nuclear obscuration traced by X-rays. This study is the first to…
View article: Photonic spectro-interferometry with SCExAO/FIRST at the Subaru Telescope: towards H-alpha imaging of protoplanets
Photonic spectro-interferometry with SCExAO/FIRST at the Subaru Telescope: towards H-alpha imaging of protoplanets Open
FIRST is a post Extreme Adaptive-Optics (ExAO) spectro-interferometer operating in the Visible (600-800 nm, R~400). Its exquisite angular resolution (a sensitivity analysis of on-sky data shows that bright companions can be detected down t…
View article: Detection of exoplanets: exploiting each property of light
Detection of exoplanets: exploiting each property of light Open
Up to now and probably for still a long time, the only support of information used to detect exoplanets has been the analysis of light, either visible or infrared. In the vast majority of cases it is the light from a star and not the light…