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Upgrading SPHERE with the second stage AO system SAXO+: frequency-based data-driven controller for adaptive optics
Isaac Dinis, François Wildi, Damien Ségransan +22
This study introduces a novel frequency-based data-driven controller for adaptive optics, using power spectral density for optimization while ensuring stability criteria. It addres…
Combining reference-star and angular differential imaging for high-contrast imaging of extended sources
Sandrine Juillard, Valentin Christiaens, Olivier Absil +2
High-contrast imaging (HCI) is a technique designed to observe faint signals near bright sources, such as exoplanets and circumstellar disks. The primary challenge in revealing the…
Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction
Johan Mazoyer, Charles Goulas, Fabrice Vidal +16
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 enhan…
Numerical simulations for the SAXO+ upgrade: Performance analysis of the adaptive optics system
Charles Goulas, Raphaël Galicher, Fabrice Vidal +16
SPHERE, operating at the VLT since 2014, is currently one of the high-contrast instruments with a higher performance. Its adaptive optics system, known as SAXO, will be upgraded to…
Astrometric and photometric characterization of Tel B combining two decades of observations
P. H. Nogueira, C. Lazzoni, A. Zurlo +11
Tel is an 18 Myr system with a 2.09 M A-type star and an M7-M8 brown dwarf companion, Tel B, separated by 4.2'' (208 au). High-contrast imaging campaigns over 20…
SPHERE RefPlanets: Search for epsilon Eridani b and warm dust
C. Tschudi, H. M. Schmid, M. Nowak +35
We carried out very deep VLT/SPHERE imaging polarimetry of the nearby system Eps Eri based on 38.5 hours of integration time with a 600 - 900 nm broadband filter to search for pola…
The SPHERE view of the Chamaeleon I star-forming region
C. Ginski, A. Garufi, M. Benisty +32
We used VLT/SPHERE to observe 20 systems in the Cha I cloud in polarized scattered light in the near-infrared. We combined the scattered light observations with existing literature…
Dynamics of the Beta Pictoris planetary system and its falling evaporating bodies
H. Beust, J. Milli, A. Morbidelli +5
For decades, the spectral variations of Beta Pictoris have been modelled as the result of the evaporation of exocomets close to the star, termed falling evaporating bodies (FEBs).…