High contrast at short separation with VLTI/GRAVITY: Bringing Gaia companions to light
N Pourré, TO Winterhalder, JB Le Bouquin… - Astronomy & …, 2024 - aanda.org
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 …
dwarfs at separations of down to 95 mas from the host star. Some of these observations …
The COBREX archival survey: Improved constraints on the occurrence rate of wide-orbit substellar companions-I. A uniform re-analysis of 400 stars from the GPIES …
V Squicciarini, J Mazoyer, AM Lagrange… - Astronomy & …, 2025 - aanda.org
Context. Direct imaging (DI) campaigns are uniquely suited to probing the outer regions
around young stars in pursuit of giant exoplanet and brown dwarf companions, providing …
around young stars in pursuit of giant exoplanet and brown dwarf companions, providing …
Making the unmodulated Pyramid wavefront sensor smart-Closed-loop demonstration of neural network wavefront reconstruction with MagAO-X
Almost all current and future high-contrast imaging instruments will use a Pyramid wavefront
sensor (PWFS) as a primary or secondary wavefront sensor. The main issue with the PWFS …
sensor (PWFS) as a primary or secondary wavefront sensor. The main issue with the PWFS …
[HTML][HTML] High-Contrast Imaging: Hide and Seek with Exoplanets
R Claudi, D Mesa - Galaxies, 2024 - mdpi.com
So far, most of the about 5700 exoplanets have been discovered mainly with radial velocity
and transit methods. These techniques are sensitive to planets in close orbits, not being able …
and transit methods. These techniques are sensitive to planets in close orbits, not being able …
Cascade adaptive optics with a second stage based on a Zernike wavefront sensor for exoplanet observations-Experimental validation on the ESO/GHOST testbed
Context. Over the past decade, the high-contrast observation of disks and gas giant planets
around nearby stars has been made possible with ground-based instruments using extreme …
around nearby stars has been made possible with ground-based instruments using extreme …
Exoplanet detection limits using spectral cross-correlation with spectro-imaging-Analytical model applied to the case of ELT/HARMONI
A Bidot, D Mouillet, A Carlotti - Astronomy & Astrophysics, 2024 - aanda.org
Context. The combination of high-contrast imaging and medium-to high-resolution
spectroscopy offers new possibilities for the detection and characterization of exoplanets …
spectroscopy offers new possibilities for the detection and characterization of exoplanets …
Into nonlinearity and beyond for Zernike-like wavefront sensors
SY Haffert - Astronomy & Astrophysics, 2024 - aanda.org
Context. Telescopes like the Extremely Large Telescope (ELT) and the Giant Magellan
Telescope (GMT) will be used together with extreme adaptive optics (AO) instruments to …
Telescope (GMT) will be used together with extreme adaptive optics (AO) instruments to …
Increasing the raw contrast of VLT/SPHERE with the dark hole technique-III. Broadband reference differential imaging of HR4796 using a four-quadrant phase mask
Context. Imaging exoplanetary systems is essential to characterizing exoplanet
atmospheres and orbits as well as circumstellar disks and to studying planet-disk …
atmospheres and orbits as well as circumstellar disks and to studying planet-disk …
Upgrading SPHERE with the second stage AO system SAXO+: frequency-based data-driven controller for adaptive optics
I Dinis, F Wildi, D Ségransan, V Gupta… - … Optics Systems IX, 2024 - spiedigitallibrary.org
This study introduces a novel frequency-based data-driven controller for adaptive optics,
using power spectral density for optimization while ensuring stability criteria. It addresses …
using power spectral density for optimization while ensuring stability criteria. It addresses …
Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction
J Mazoyer, C Goulas, F Vidal, IB Dinis… - Ground-based and …, 2024 - spiedigitallibrary.org
SAXO+ is a planned enhancement of the existing SAXO, the VLT/SPHERE adaptive optics
system, deployed on ESO's Very Large Telescope. This upgrade is designed to significantly …
system, deployed on ESO's Very Large Telescope. This upgrade is designed to significantly …