Nicolas Crouzet
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View article: Horizontal and vertical exoplanet thermal structure from a JWST spectroscopic eclipse map
Horizontal and vertical exoplanet thermal structure from a JWST spectroscopic eclipse map Open
Highly irradiated giant exoplanets known ‘ultrahot Jupiters’ are anticipated to exhibit large variations of atmospheric temperature and chemistry as a function of longitude, latitude and altitude. Previous observations have hinted at these…
View article: Sensitivity to Sub-Io-sized Exosatellite Transits in the MIRI LRS Light Curve of the Nearest Substellar Worlds
Sensitivity to Sub-Io-sized Exosatellite Transits in the MIRI LRS Light Curve of the Nearest Substellar Worlds Open
JWST’s unprecedented sensitivity enables precise spectrophotometric monitoring of substellar worlds, revealing atmospheric variability driven by mechanisms operating across different pressure levels. This same precision now permits excepti…
View article: Testing the performance of cross-correlation techniques to search for molecular features in <i>JWST</i> NIRSpec G395H observations of transiting exoplanets
Testing the performance of cross-correlation techniques to search for molecular features in <i>JWST</i> NIRSpec G395H observations of transiting exoplanets Open
Cross-correlations techniques offer an alternative method to search for molecular species in James Webb Space Telescope (JWST) observations of exoplanet atmospheres. In a previous article, we applied cross-correlation functions for the fir…
View article: The <i>JWST</i> weather report from the nearest brown dwarfs II: consistent variability mechanisms over 7 months revealed by 1–14 μm NIRSpec + MIRI monitoring of WISE 1049AB
The <i>JWST</i> weather report from the nearest brown dwarfs II: consistent variability mechanisms over 7 months revealed by 1–14 μm NIRSpec + MIRI monitoring of WISE 1049AB Open
We present a new epoch of JWST spectroscopic variability monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwarfs known. Our 8-h JWST/MIRI low resolution spectroscopy and 7-h JWST/NIRSpec prism observ…
View article: The JWST weather report from the nearest brown dwarfs II: Consistent variability mechanisms over 7 months revealed by 1-14 $μ$m NIRSpec + MIRI monitoring of WISE 1049AB
The JWST weather report from the nearest brown dwarfs II: Consistent variability mechanisms over 7 months revealed by 1-14 $μ$m NIRSpec + MIRI monitoring of WISE 1049AB Open
We present a new epoch of JWST spectroscopic variability monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwarfs known. Our 8-hour MIRI low resolution spectroscopy (LRS) and 7-hour NIRSpec prism obse…
View article: Extended source fringe flats for the JWST MIRI Medium Resolution Spectrometer
Extended source fringe flats for the JWST MIRI Medium Resolution Spectrometer Open
Context . The detectors of the JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer (MRS) form low-finesse resonating cavities that cause periodic count rate modulations (fringes) with peak amplitudes of up to 15% for sources…
View article: Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the Early Release Science Ice Age program
Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the Early Release Science Ice Age program Open
Protostars contain icy ingredients necessary for the formation of potential habitable worlds, therefore, it is crucial to understand their chemical and physical environments. This work is focused on the ice features towards the binary prot…
View article: Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the ERS Ice Age program
Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the ERS Ice Age program Open
This work focuses on the ice features toward the binary protostellar system Ced 110 IRS 4A and 4B, and observed with JWST as part of the Early Release Science Ice Age collaboration. We aim to explore the JWST observations of the binary pro…
View article: Atmospheric Retrievals Suggest the Presence of a Secondary Atmosphere and Possible Sulfur Species on L98-59 d from JWST Nirspec G395H Transmission Spectroscopy
Atmospheric Retrievals Suggest the Presence of a Secondary Atmosphere and Possible Sulfur Species on L98-59 d from JWST Nirspec G395H Transmission Spectroscopy Open
L 98-59 d is a Super-Earth planet orbiting an M-type star. We performed retrievals on the transmission spectrum of L 98-59 d obtained using NIRSpec G395H during a single transit, from JWST Cycle 1 GTO 1224. The wavelength range of this spe…
View article: Hints of a Sulfur-rich Atmosphere around the 1.6 R <sub>⊕</sub> Super-Earth L98-59 d from JWST NIRspec G395H Transmission Spectroscopy
Hints of a Sulfur-rich Atmosphere around the 1.6 R <sub>⊕</sub> Super-Earth L98-59 d from JWST NIRspec G395H Transmission Spectroscopy Open
Detecting atmospheres around planets with a radius below 1.6 R ⊕ , commonly referred to as rocky planets, has proven to be challenging. However, rocky planets orbiting M dwarfs are ideal candidates due to their favorable planet-to-star rad…
View article: Identifying and fitting eclipse maps of exoplanets with cross-validation
Identifying and fitting eclipse maps of exoplanets with cross-validation Open
Eclipse mapping uses the shape of the eclipse of an exoplanet to measure its two-dimensional structure. Light curves are mostly composed of longitudinal information, with the latitudinal information only contained in the brief ingress and …
View article: Inhomogeneous terminators on the exoplanet WASP-39 b
Inhomogeneous terminators on the exoplanet WASP-39 b Open
View article: A benchmark JWST near-infrared spectrum for the exoplanet WASP-39 b
A benchmark JWST near-infrared spectrum for the exoplanet WASP-39 b Open
View article: The <i>JWST</i> weather report from the nearest brown dwarfs I: multiperiod <i>JWST</i> NIRSpec + MIRI monitoring of the benchmark binary brown dwarf WISE 1049AB
The <i>JWST</i> weather report from the nearest brown dwarfs I: multiperiod <i>JWST</i> NIRSpec + MIRI monitoring of the benchmark binary brown dwarf WISE 1049AB Open
We report results from 8 h of JWST/MIRI low resolution spectroscopic (LRS) monitoring directly followed by 7 h of JWST/NIRSpec prism spectroscopic monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwa…
View article: Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b
Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b Open
This repository contains data inputs and analysis products for the manuscript "Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b" (Challener et al., 2024) accepted for publication in The Astrophysical Journal Letters. The archive…
View article: Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b
Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b Open
We present two-dimensional near-infrared temperature maps of the canonical hot Jupiter WASP-43b using a phase-curve observation with JWST NIRSpec/G395H. From the white-light planetary transit, we improve constraints on the planet’s orbital…
View article: Debris Disks Can Contaminate Mid-infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39
Debris Disks Can Contaminate Mid-infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39 Open
The signal from a transiting planet can be diluted by astrophysical contamination. In the case of circumstellar debris disks, this contamination could start in the mid-infrared and vary as a function of wavelength, which would then change …
View article: Imaging of I Zw 18 by JWST: II. Spatially resolved star formation history
Imaging of I Zw 18 by JWST: II. Spatially resolved star formation history Open
The blue compact dwarf galaxy I Zw 18 is one of the most metal-poor ($Z \sim 3% Z_{\sun}$) star-forming galaxies in the local Universe. Its evolutionary status has sparked debate within the astronomical community. We aim to investigate the…
View article: Imaging of I Zw 18 by JWST
Imaging of I Zw 18 by JWST Open
Context. The blue compact dwarf (BCD) galaxy I Zw 18 is one of the most metal-poor ( Z ∼ 3% Z ⊙ ) star-forming galaxies known in the local Universe. Since its discovery, the evolutionary status of this system has been at the center of nume…
View article: Imaging of I Zw 18 by JWST. I. Detecting Dusty Stellar Populations
Imaging of I Zw 18 by JWST. I. Detecting Dusty Stellar Populations Open
We present a JWST imaging survey of I Zw 18, the archetypal extremely metal-poor, star-forming (SF), blue compact dwarf galaxy. With an oxygen abundance of only ∼3% Z ⊙ , it is among the lowest-metallicity systems known in the local Univer…
View article: Simultaneous retrieval of orbital phase resolved <i>JWST</i>/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia, and carbon monoxide
Simultaneous retrieval of orbital phase resolved <i>JWST</i>/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia, and carbon monoxide Open
Spectroscopic phase curves of hot Jupiters measure their emission spectra at multiple orbital phases, thus enabling detailed characterization of their atmospheres. Precise constraints on the atmospheric composition of these exoplanets offe…
View article: Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia and carbon monoxide
Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia and carbon monoxide Open
Spectroscopic phase curves of hot Jupiters measure their emission spectra at multiple orbital phases, thus enabling detailed characterisation of their atmospheres. Precise constraints on the atmospheric composition of these exoplanets offe…
View article: Debris Disks can Contaminate Mid-Infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39
Debris Disks can Contaminate Mid-Infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39 Open
The signal from a transiting planet can be diluted by astrophysical contamination. In the case of circumstellar debris disks, this contamination could start in the mid-infrared and vary as a function of wavelength, which would then change …
View article: Two-dimensional Eclipse Mapping of the Hot-Jupiter WASP-43b with JWST MIRI/LRS
Two-dimensional Eclipse Mapping of the Hot-Jupiter WASP-43b with JWST MIRI/LRS Open
We present eclipse maps of the two-dimensional thermal emission from the dayside of the hot-Jupiter WASP-43b, derived from an observation of a phase curve with the JWST MIRI/LRS instrument. The observed eclipse shapes deviate significantly…
View article: Identifying and Fitting Eclipse Maps of Exoplanets with Cross-Validation
Identifying and Fitting Eclipse Maps of Exoplanets with Cross-Validation Open
Eclipse mapping uses the shape of the eclipse of an exoplanet to measure its two-dimensional structure. Light curves are mostly composed of longitudinal information, with the latitudinal information only contained in the brief ingress and …
View article: A warm Neptune’s methane reveals core mass and vigorous atmospheric mixing
A warm Neptune’s methane reveals core mass and vigorous atmospheric mixing Open
View article: The <i>β</i> Pictoris b Hill sphere transit campaign
The <i>β</i> Pictoris b Hill sphere transit campaign Open
The β Pictoris system is the closest known stellar system with directly detected gas giant planets, an edge-on circumstellar disc, and evidence of falling sublimating bodies and transiting exocomets. The inner planet, β Pictoris c, has als…
View article: Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b
Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b Open
View article: Two-Dimensional Eclipse Mapping of the Hot Jupiter WASP-43b with JWST MIRI/LRS
Two-Dimensional Eclipse Mapping of the Hot Jupiter WASP-43b with JWST MIRI/LRS Open
We present eclipse maps of the two-dimensional thermal emission from the dayside of the hot Jupiter WASP-43b, derived from an observation of a phase curve with the JWST MIRI/LRS instrument. The observed eclipse shapes deviate significantly…
View article: Data from Imaging of I Zw 18 by JWST: I. Strategy and First Results of Dusty Stellar Populations
Data from Imaging of I Zw 18 by JWST: I. Strategy and First Results of Dusty Stellar Populations Open
We present a JWST imaging survey of I Zw 18, the archetypal extremely\nmetal-poor, star-forming (SF), blue compact dwarf galaxy. With an oxygen\nabundance of only $\\sim$3% $Z_{\\odot}$, it is among the lowest-metallicity\nsystems known in…