Jorge Llop-Sayson
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View article: JWST/MIRI Imaging of the Warm Dust Component of the <i>ϵ</i> Eridani Debris Disk
JWST/MIRI Imaging of the Warm Dust Component of the <i>ϵ</i> Eridani Debris Disk Open
We present JWST/MIRI observations of the debris disk surrounding the nearby solar analog ϵ Eridani obtained as part of the Archetypal Debris Disk Guaranteed Time Observation program. Multiwavelength images from 15, 18, 21, and 25.5 μ m sho…
View article: Wavefront error recovery and companion identification with the James Webb Space Telescope
Wavefront error recovery and companion identification with the James Webb Space Telescope Open
The James Webb Space Telescope is orders of magnitude more sensitive than any other facility across the near to mid-infrared wavelengths. Many approved programs take advantage of its highly stable point spread function (PSF) to directly de…
View article: Searching for Planets Orbiting <i>ϵ</i> Eridani with JWST/NIRCam
Searching for Planets Orbiting <i>ϵ</i> Eridani with JWST/NIRCam Open
We present observations of ϵ Eridani with the JWST/NIRCam coronagraph aimed at imaging planets orbiting within this system. In particular, these observations targeted (1) the Jupiter-like planet, first detected orbiting at 3.5 au with radi…
View article: Probing the Outskirts of M Dwarf Planetary Systems with a Cycle 1 JWST NIRCam Coronagraphy Survey
Probing the Outskirts of M Dwarf Planetary Systems with a Cycle 1 JWST NIRCam Coronagraphy Survey Open
The population of giant planets on wide orbits around low-mass M dwarf stars is poorly understood, but the unprecedented sensitivity of JWST NIRCam coronagraphic imaging now provides direct access to planets significantly less massive than…
View article: Searching for Planets Orbiting $ε$~Eridani with JWST/NIRCam
Searching for Planets Orbiting $ε$~Eridani with JWST/NIRCam Open
We present observations of \epseri~with the JWST/NIRCam coronagraph aimed at imaging planets orbiting within this system. In particular, these observations targeted (1) the Jupiter-like planet, first detected orbiting at 3.5 AU with radial…
View article: Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits Open
We report on coronagraphic observations of the nearest solar-type star, α Centauri A ( α Cen A), using the MIRI instrument on the James Webb Space Telescope. The proximity of α Cen (1.33 pc) means that the star’s habitable zone is spatiall…
View article: Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis
Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis Open
The James Webb Space Telescope (JWST) observed our closest solar twin, α Centauri A ( α Cen A), with the Mid-Infrared Instrument in the F1550C (15.5 μ m) coronagraphic imaging mode at three distinct epochs between 2024 August and 2025 Apri…
View article: A Preliminary Search for Planets and Exozodiacal Emission Around <i>α</i> Centauri A with JWST/MIRI
A Preliminary Search for Planets and Exozodiacal Emission Around <i>α</i> Centauri A with JWST/MIRI Open
We present F1550C (15.5 μ m) coronagraphic imaging observations of the nearest solar-type star α Cen A using the James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI). The observations, executed in 2025 February, were compromise…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. III. Aperture Masking Interferometric Observations of the Star HIP 65426 at 3.8 <i>μ</i>m
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. III. Aperture Masking Interferometric Observations of the Star HIP 65426 at 3.8 <i>μ</i>m Open
We present aperture masking interferometry (AMI) observations of the star HIP 65426 at 3.8 μ m, as part of the JWST Direct Imaging Early Release Science program, obtained using the Near Infrared Imager and Slitless Spectrograph instrument.…
View article: JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO<sub>2</sub> in the HR 8799 and 51 Eri Exoplanets’ Atmospheres
JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO<sub>2</sub> in the HR 8799 and 51 Eri Exoplanets’ Atmospheres Open
High-contrast observations with JWST can reveal key composition and vertical mixing dependent absorption features in the spectra of directly imaged planets across the 3–5 μ m wavelength range. We present novel coronagraphic images of the H…
View article: Searching for Planets Orbiting Vega with the James Webb Space Telescope
Searching for Planets Orbiting Vega with the James Webb Space Telescope Open
The most prominent of the IRAS debris disk systems, α Lyrae (Vega), at a distance of 7.7 pc, has been observed by both the NIRCam and MIRI instruments on the James Webb Space Telescope. This paper describes NIRCam coronagraphic observation…
View article: Searching for Planets Orbiting Vega with the James Webb Space Telescope
Searching for Planets Orbiting Vega with the James Webb Space Telescope Open
The most prominent of the IRAS debris disk systems, $α$ Lyrae (Vega), at a distance of 7.7 pc, has been observed by both the NIRCam and MIRI instruments on the James Webb Space Telescope (JWST). This paper describes NIRCam coronagraphic ob…
View article: orbitize! v3: Orbit fitting for the High-contrastImaging Community
orbitize! v3: Orbit fitting for the High-contrastImaging Community Open
Instrumentation
View article: orbitize! v3: Orbit fitting for the High-contrast Imaging Community
orbitize! v3: Orbit fitting for the High-contrast Imaging Community Open
orbitize! is a package for Bayesian modeling of the orbital parameters of resolved binary objects from time series measurements. It was developed with the needs of the high-contrast imaging community in mind, and has since also become wide…
View article: JWST-TST High Contrast: Achieving Direct Spectroscopy of Faint Substellar Companions Next to Bright Stars with the NIRSpec Integral Field Unit
JWST-TST High Contrast: Achieving Direct Spectroscopy of Faint Substellar Companions Next to Bright Stars with the NIRSpec Integral Field Unit Open
The JWST NIRSpec integral field unit (IFU) presents a unique opportunity to observe directly imaged exoplanets from 3 to 5 μ m at moderate spectral resolution ( R ∼ 2700) and thereby better constrain the composition, disequilibrium chemist…
View article: Implicit electric field conjugation through a single-mode fiber
Implicit electric field conjugation through a single-mode fiber Open
Connecting a coronagraph instrument to a spectrograph via a single-mode optical fiber is a promising technique for characterizing the atmospheres of exoplanets with ground and space-based telescopes. However, due to the small separation an…
View article: Implicit Electric Field Conjugation Through a Single-mode Fiber
Implicit Electric Field Conjugation Through a Single-mode Fiber Open
Connecting a coronagraph instrument to a spectrograph via a single-mode optical fiber is a promising technique for characterizing the atmospheres of exoplanets with ground and space-based telescopes. However, due to the small separation an…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256-1257 b
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256-1257 b Open
The unprecedented medium-resolution (R~1500-3500) near- and mid-infrared (1-18um) spectrum provided by JWST for the young (140+/-20Myr) low-mass (12-20MJup) L-T transition (L7) companion VHS1256b gives access to a catalogue of molecular ab…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256–1257 b
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256–1257 b Open
The unprecedented medium-resolution ( R λ ∼ 1500–3500) near- and mid-infrared (1–18 μ m) spectrum provided by JWST for the young (140 ± 20 Myr) low-mass (12–20 M Jup ) L–T transition (L7) companion VHS 1256 b gives access to a catalog of m…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned Open
We present a performance analysis for the aperture masking interferometry (AMI) mode on board the James Webb Space Telescope Near Infrared Imager and Slitless Spectrograph (JWST/NIRISS). Thanks to self-calibrating observables, AMI accesses…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned Open
We present a performance analysis for the aperture masking interferometry (AMI) mode on board the James Webb Space Telescope Near Infrared Imager and Slitless Spectrograph (JWST/NIRISS). Thanks to self-calibrating observables, AMI accesses…
View article: Searching for Planets Orbiting Fomalhaut with JWST/NIRCam
Searching for Planets Orbiting Fomalhaut with JWST/NIRCam Open
We report observations with the JWST/NIRCam coronagraph of the Fomalhaut ( α PsA) system. This nearby A star hosts a complex debris disk system discovered by the IRAS satellite. Observations in F444W and F356W filters using the round 430R …
View article: Searching for Planets Orbiting Fomalhaut with JWST/NIRCam
Searching for Planets Orbiting Fomalhaut with JWST/NIRCam Open
We report observations with the JWST/NIRCam coronagraph of the Fomalhaut system. This nearby A star hosts a complex debris disk system discovered by the IRAS satellite. Observations in F444W and F356W filters using the round 430R mask achi…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems III: Aperture Masking Interferometric Observations of the star HIP 65426 at 3.8 um
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems III: Aperture Masking Interferometric Observations of the star HIP 65426 at 3.8 um Open
We present aperture masking interferometry (AMI) observations of the star HIP 65426 at $3.8\,\rm{μm}$ as a part of the JWST Direct Imaging Early Release Science (ERS) program obtained using the Near Infrared Imager and Slitless Spectrograp…
View article: JWST-TST High Contrast: Achieving direct spectroscopy of faint substellar companions next to bright stars with the NIRSpec IFU
JWST-TST High Contrast: Achieving direct spectroscopy of faint substellar companions next to bright stars with the NIRSpec IFU Open
The JWST NIRSpec integral field unit (IFU) presents a unique opportunity to observe directly imaged exoplanets from 3-5 um at moderate spectral resolution (R~2,700) and thereby better constrain the composition, disequilibrium chemistry, an…
View article: Benefits of adding radial phase dimples on scalar coronagraph phase masks
Benefits of adding radial phase dimples on scalar coronagraph phase masks Open
Current scalar coronagraph focal plane mask designs are performance-limited by chromaticity. We investigate the effects of adding central Roddier and dual zone phase dimples to scalar vortex masks to improve broadband performance by suppre…
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-contrast Imaging of the Exoplanet HIP 65426 b from 2 to 16 μm
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-contrast Imaging of the Exoplanet HIP 65426 b from 2 to 16 μm Open
We present JWST Early Release Science coronagraphic observations of the super-Jupiter exoplanet, HIP 65426b, with the Near-Infrared Camera (NIRCam) from 2 to 5 μ m, and with the Mid-Infrared Instrument (MIRI) from 11 to 16 μ m. At a separa…
View article: Spatially resolved imaging of the inner Fomalhaut disk using JWST/MIRI
Spatially resolved imaging of the inner Fomalhaut disk using JWST/MIRI Open
View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-Contrast Imaging of the Exoplanet HIP 65426 b from 2−16 µm
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-Contrast Imaging of the Exoplanet HIP 65426 b from 2−16 µm Open
International audience
View article: JWST Observations of the Enigmatic Y-Dwarf WISE 1828+2650. I. Limits to a Binary Companion
JWST Observations of the Enigmatic Y-Dwarf WISE 1828+2650. I. Limits to a Binary Companion Open
The Y-dwarf WISE 1828+2650 is one of the coldest known brown dwarfs with an effective temperature of ∼300 K. Located at a distance of just 10 pc, previous model-based estimates suggest WISE1828+2650 has a mass of ∼5–10 M J , making it a va…