Alexis Bidot
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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: Combining high-contrast imaging with high-resolution spectroscopy: Actual on-sky MIRI/MRS results compared to expectations
Combining high-contrast imaging with high-resolution spectroscopy: Actual on-sky MIRI/MRS results compared to expectations Open
Context. Combining high-contrast imaging with high-resolution spectroscopy represents a powerful approach to detecting and characterizing exoplanets around nearby stars, despite the challenges posed by their faintness. Instruments like VLT…
View article: High contrast at short separation with VLTI/GRAVITY: Bringing Gaia companions to light
High contrast at short separation with VLTI/GRAVITY: Bringing Gaia companions to light Open
Since 2019, GRAVITY has provided direct observations of giant planets and brown dwarfs at separations of down to 95 mas from the host star. Some of these observations have provided the first direct confirmation of companions previously det…
View article: High contrast at short separation with VLTI/GRAVITY: Bringing <i>Gaia</i> companions to light
High contrast at short separation with VLTI/GRAVITY: Bringing <i>Gaia</i> companions to light Open
Context. Since 2019, GRAVITY has provided direct observations of giant planets and brown dwarfs at separations of down to 95 mas from the host star. Some of these observations have provided the first direct confirmation of companions previ…
View article: Exoplanet detection limits using spectral cross-correlation with spectro-imaging
Exoplanet detection limits using spectral cross-correlation with spectro-imaging Open
Context. The combination of high-contrast imaging and medium- to high-resolution spectroscopy offers new possibilities for the detection and characterization of exoplanets. The so-called molecular mapping technique makes use of the differe…
View article: Détection et caractérisation des atmosphères exoplanétaires par couplage de l'imagerie directe et de la spectroscopie à moyenne ou haute résolution spectrale
Détection et caractérisation des atmosphères exoplanétaires par couplage de l'imagerie directe et de la spectroscopie à moyenne ou haute résolution spectrale Open
Medium or high spectral resolution is highly significant for characterizing the composition of planetary atmospheres, and is essential for the search for bio-signatures. Coupling techniques between spectroscopy and direct imaging instrumen…
View article: Visible extreme adaptive optics on extremely large telescopes: towards detecting oxygen in Proxima Centauri b and analogs
Visible extreme adaptive optics on extremely large telescopes: towards detecting oxygen in Proxima Centauri b and analogs Open
International audience
View article: Integrated photonic-based coronagraphic systems for future space telescopes
Integrated photonic-based coronagraphic systems for future space telescopes Open
International audience
View article: Integrated photonic-based coronagraphic systems for future space telescopes
Integrated photonic-based coronagraphic systems for future space telescopes Open
The detection and characterization of Earth-like exoplanets around Sun-like stars is a primary science motivation for the Habitable Worlds Observatory. However, the current best technology is not yet advanced enough to reach the 10^-10 con…
View article: Visible extreme adaptive optics on extremely large telescopes: Towards detecting oxygen in Proxima Centauri b and analogs
Visible extreme adaptive optics on extremely large telescopes: Towards detecting oxygen in Proxima Centauri b and analogs Open
Looking to the future of exo-Earth imaging from the ground, core technology developments are required in visible extreme adaptive optics (ExAO) to enable the observation of atmospheric features such as oxygen on rocky planets in visible li…
View article: Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory
Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory Open
NASA is engaged in planning for a Habitable Worlds Observatory (HabWorlds ), a coronagraphic space mission to detect rocky planets in habitable zones and establish their habitability. Surface liquid water is central to the definition of pl…
View article: Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory" Open
Data for the paper on "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
View article: Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory" Open
Data for the paper on "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
View article: On-sky demonstration at Palomar Observatory of the near-IR, high-resolution VIPA spectrometer
On-sky demonstration at Palomar Observatory of the near-IR, high-resolution VIPA spectrometer Open
A near-IR high-resolution, R=80000 spectrometer has been developed at IPAG to\ndirectly characterize the atmosphere of exoplanets using adaptive optics (AO)\nassisted telescopes, and a single-mode fiber-injection unit. A first technical\nt…
View article: HARMONI at ELT: system analysis and performance estimation of the high-contrast module
HARMONI at ELT: system analysis and performance estimation of the high-contrast module Open
International audience