Daniele Vassallo
A5032508280- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Advanced optical system design
- Optical Systems and Laser Technology
- Astronomical Observations and Instrumentation
- Optical Wireless Communication Technologies
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Geophysics and Sensor Technology
- Gamma-ray bursts and supernovae
- Infrared Target Detection Methodologies
- solar cell performance optimization
- Advancements in Photolithography Techniques
- Advanced Measurement and Metrology Techniques
- Galaxies: Formation, Evolution, Phenomena
- Optical measurement and interference techniques
- Pelvic and Acetabular Injuries
- Radio Astronomy Observations and Technology
- Advances in Cucurbitaceae Research
- Education and Technology Integration
- Geophysics and Gravity Measurements
- Satellite Image Processing and Photogrammetry
- Image Processing Techniques and Applications
- Advanced Optical Sensing Technologies
Osservatorio Astronomico di Padova
2016-2024
Laboratoire d’Astrophysique de Marseille
2023
National Institute of Optics
2017-2022
National Institute for Astrophysics
2016-2021
University of Padua
2015-2020
Institut de Planétologie et d'Astrophysique de Grenoble
2018
A consortium of several Australian and European institutes – together with the Southern Observatory (ESO) has initiated design MAVIS, a Multi-Conjugate Adaptive Optics (MCAO) system for ground- based 8-m Very Large Telescope (VLT). MAVIS (MCAO-assisted Visible Imager Spectrograph) will deliver visible images integral field spectrograph data 2-3x better angular resolution than Hubble Space Telescope, making it powerful complement at wavelengths to future facilities like space-based James Webb...
SHARK-NIR channel is one of the two coronagraphic instruments proposed for Large Binocular Telescope, in framework call second generation instruments, issued 2014. Together with SHARK-VIS channel, it will offer a few observing modes (direct imaging, imaging and low resolution spectroscopy) covering wide wavelength domain, going from 0.5μm to 1.7μm. Initially as an instrument also K-band, current design foresees camera working Y H bands, exploiting this way synergy other LBT such LBTI,...
Context . Full sky coverage adaptive optics (AO) on extremely large telescopes requires the adoption of several laser guide stars as references. With such apertures, apparent elongation beacons is absolutely significant. a few exceptions, wavefront sensors (WFSs) designed for natural can be adapted and used in suboptimal mode this context. Aims We analyse describe geometrical properties class WFSs that are specifically to deal with propagated from location immediate vicinity telescope...
We revisit one class of z-invariant WaveFront sensor where the LGS is fired aside telescope aperture.In this way there a spatial dependence on focal plane with respect to height resonant scattering occurs.We revise basic parameters involving geometry and we propose various merit functions define how much improvement can be attained by approach.We show that refractive approaches are not viable discuss several solutions reflective ones in what has been nicknamed "ingot wavefront sensor"...
In this article we report the results of a comprehensive simulation program aimed at investigating coronagraphic capabilities SHARK-NIR, camera selected to proceed final design phase Large Binocular Telescope. For purpose, developed dedicated tool based on physical optics propagation. The code propagates wavefronts through SHARK optical train in an end-to-end fashion and can implement any kind coronagraph. Detection limits be finally computed, exploring wide range Strehl values observing conditions.
SHARK-NIR is an instrument which provides direct imaging, coronagraphic dual band imaging and low resolution spectroscopy in Y, J H bands, taking advantage of the outstanding performance Large Binocular Telescope AO systems. observations will be provided used combination with SHARK-VIS (operating V band) LMIRCam LBTI from K to M bands), a way exploit simultaneous three different wavelengths. A wide variety techniques have been implemented SHARK-NIR, ranging conventional ones such as Gaussian...
Laser Guide Stars are, in spite of their name, all but "stars". They do not stand at infinite distance, neither on a plane. If fired from the side large telescope characteristics as seen various points apertures changes dramatically. As they extend 3D world, there is need WFS that deploy similar manner, conjugated volume, resembling approach MCAO required long time ago to overcome usual limitations conventional AO. We describe class novel kind employ combination refraction and reflection,...
A robust post processing technique is mandatory for analysing the coronagraphic high contrast imaging data. Angular Differential Imaging (ADI) and Principal Component Analysis (PCA) are most used approaches to suppress quasi-static structure presents in Point Spread Function (PSF) revealing planets at different separations from host star. In this work, we present comparison between ADI PCA applied System of coronagraphy with High order Adaptive optics R K band (SHARK-NIR), which will be...
In this paper, we present an overview of the System Design Analysis carried on for SHARK-NIR, coronagraphic camera designed to take advantage outstanding performance that can be obtained with FLAO facility at LBT, in near infrared regime. Born as a fast-track project, system now foresees both direct imaging and spectroscopic observing mode, together first order wavefront correction tool. The analysis here report includes several trade-offs selection baseline design, terms optical mechanical...
Stellar activity influences radial velocity (RV) measurements and can also mimic the presence of orbiting planets. As part search for planets around components wide binaries performed with SARG High Resolution Spectrograph at TNG, it was discovered that HD 200466A shows strong variation in RV is well correlated index based on H$_\alpha$. We used to study H$_\alpha$ line variations each component a few bright stars test capability revealing rotation period or cycle. analysed relations between...
TIPTOP is a python library that able to quickly compute Point Spread Functions (PSF) of any kind Adaptive Optics systems. This has multiple objectives: support the exposure time calculators future VLT and ELT instruments, adaptive optics systems design activities, be part PSF reconstruction pipelines selection best asterism natural guide stars for observation preparation. Here we report one last improvements TIPTOP: introduction error given by single conjugated laser, commonly known as cone...
The Adaptive Optics Module of MAVIS is a self-contained MCAO module, which delivers corrected FoV to the postfocal scientific instruments, in visible. module aims exploit full potential ESO VLT UT4 Facility, composed high spatial frequency deformable secondary mirror and laser guide stars launching control systems. During Phase A, we evaluated, with support simulations analysis at different levels, main terms error budgets aiming estimating realistic AOM performance. After introducing...
Phase diversity is a focal plane wavefront sensing technique that allows to retrieve the phase aberration introduced by camera starting from two images of whatever object, one which (the diverse image) intentionally corrupted known aberration. We present here results simulation campaign aimed at assessing validity this approach for non-common path aberrations (NCPA) in SHARK-NIR, new-generation high-contrast imager Large Binocular Telescope (LBT). The be retrieved has been modeled on...
The MCAO Assisted Visible Imager and Spectrograph (MAVIS) is a facility-grade visible instrument, currently under development for the Adaptive Optics Facility at VLT. adaptive optics system will feed both an imager integral field spectrograph, with unprecedented sky coverage of 50% Galactic Pole. deliver diffraction-limited image quality in V band, cover 30" x view, imaging from U to z bands. conceptual design spectrograph has selectable field-of-view 2.5" 3.6", or 5" 7.2", spatial sampling...
The MCAO Assisted Visible Imager and Spectrograph (MAVIS) Adaptive Optics Module has very demanding goals to support science in the optical: providing 15% SR V band on a large FoV of 30arcsec diameter standard atmospheric conditions at Paranal. It will be able work closed loop up three natural guide stars down H=19, sky coverage larger than 50% south galactic pole. Such exploration system parameters space have required combination analytical end- to-end simulations assess performance, drive...
In the context of ADONI, newly constituted laboratory for INAF Adaptive Optics activities, it is foreseen to set-up a facility accessible Italian and international AO community, with purpose facilitating testing critical sub-systems or components (which may be part instruments under construction), prototypes innovative concepts which require on-sky demonstrations. The 182cm Copernico Telescope located in Asiago (Italy) has been selected suitable place this public facility, where common...
Dark wavefront sensing takes shape following quantum mechanics concepts in which one is able to "see" an object path of a two-arm interferometer using as low desired amount light actually "hitting" the occulting object. A theoretical way achieve such goal, but realm sensing, represented by combination two unequal beams sharing same incoming light, and whose difference length continuously adjusted order show different signals for signs perturbation. Furthermore, obtain this white should be...
Full sky coverage Adaptive Optics on Extremely Large Telescopes requires the adoption of several Laser Guide Stars as references.With such large apertures, apparent elongation beacons is absolutely significant.With few exceptions,WaveFront Sensors designed for Natural are adapted and used in suboptimal mode this context. We analyse describe geometrical properties a class WaveFront that specifically to deal with propagated from location immediate vicinity telescope aperture. three dimensions...
The combination of detection techniques enhances our ability to identify companions orbiting nearby stars. We employed high-contrast imaging constrain mass and separation possible responsible for the significant proper motion anomalies stars HIP 11696, 47110 36277. These targets were observed using LBT's camera, SHARK-NIR, in H-band a Gaussian coronagraph, with LMIRCam instrument L'-band vAPP coronagraph. Both observations conducted simultaneously. Additionally, constraints at short...
SHARK-NIR (System for coronagraphy with high order adaptive optics in Z and H band) has completed its commissioning phase at the Large Binocular Telescope. Four runs of one to two weeks each allowed team significantly strengthen architecture SHINS, instrument control software. In this contribution, we present main improvements: 1) new engineering panel, dedicated Real Time Computing system; 2) process implemented correct non-rotating (instrument-driven) rotating (telescope-driven)...
ABSTRACT The combination of detection techniques enhances our ability to identify companions orbiting nearby stars. We employed high-contrast imaging constrain mass and separation possible responsible for the significant proper motion anomalies stars HIP 11696, 47110, 36277. These targets were observed using LBT’s camera, SHARK-NIR, in H band a Gaussian coronagraph, with LMIRCam instrument L’ vAPP coronagraph. Both observations conducted simultaneously. Additionally, constraints at short...