A5010799965- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Optical Wireless Communication Technologies
- Advanced Thermodynamics and Statistical Mechanics
- Statistical Mechanics and Entropy
- Stellar, planetary, and galactic studies
- Advanced optical system design
- Optical Systems and Laser Technology
- Gamma-ray bursts and supernovae
- Quantum chaos and dynamical systems
- Complex Systems and Time Series Analysis
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Advanced Adaptive Filtering Techniques
- Combustion and Detonation Processes
- Astrophysics and Star Formation Studies
- Machine Learning in Bioinformatics
- Spectroscopy and Chemometric Analyses
- Space Satellite Systems and Control
- Acoustic Wave Phenomena Research
- Nonlinear Dynamics and Pattern Formation
- SARS-CoV-2 and COVID-19 Research
- Phase Equilibria and Thermodynamics
Arcetri Astrophysical Observatory
2012-2024
Orbits Lightwave (United States)
2024
National Institute for Astrophysics
2020
University of Florence
2012-2016
Ricerca sul Sistema Energetico (Italy)
2011-2012
Centre de Physique Théorique
2011-2012
Aix-Marseille Université
2011
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2010-2011
Laboratoire de Physique Théorique
2011
Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes
2011
A general method to determine covariant Lyapunov vectors in both discrete- and continuous-time dynamical systems is introduced. This allows us address fundamental questions such as the degree of hyperbolicity, which can be quantified terms transversality these intrinsic vectors. For spatially extended systems, have localization properties spatial Fourier spectra qualitatively different from those composing orthonormalized basis obtained standard procedure used calculate exponents.
The last decade has seen a revolution in our knowledge of the Galaxy thanks to Gaia and asteroseismic space missions ground-based spectroscopic surveys. To complete this picture, it is necessary map ages its stellar populations. During recent years, dependence on time abundance ratios involving slow (s) neutron-capture $\alpha$ elements (called chemical-clocks) been used provide estimates ages, usually limited volume close Sun. We aim analyse relations chemical clocks Galactic disc extending...
One of the main goals feasibility study MOSE (MOdellig ESO Sites) is to evaluate performances a method conceived forecast optical turbulence above sites Very Large Telescope and European-Extremely in Chile. The implied use dedicated code for (OT) called Astro-Meso-Nh. In this paper we present results obtained at conclusion project concerning forecasting most relevant parameters related (CN2, seeing , isoplanatic angle theta_0 wavefront coherence time tau_0). Numerical predictions very rich...
Context. In the present-day panorama of large spectroscopic surveys, amount, diversity, and complexity available data continuously increase. The overarching goal studying formation evolution our Galaxy is hampered by heterogeneity instruments, selection functions, analysis methods, measured quantities. Aims. We present a comprehensive catalogue, Survey Surveys (SoS), built homogeneously merging radial velocity (RV) determinations largest ground-based surveys to date, such as APOGEE, GALAH,...
ABSTRACT In this study we demonstrate that can provide forecasts of all the main astroclimatic parameters (seeing, wavefront coherence time, isoplanatic angle, and ground-layer fraction) on time-scales 1 2 h (the most critical ones for service mode) with a root-mean-square error (RMSE) is smaller than or, at worst, comparable to instrumental uncertainty (i.e. standard deviation between instrument estimates). The seeing RMSE 0.08 arcsec. Results are achieved thank use autoregressive method...
(Shortened). In the era of large surveys and space missions, it is necessary to rely on samples well-characterized stars for inter-calibrating comparing measurements from different sources. Among most employed photometric systems, Johnson-Kron-Cousins has been used decades a amount important datasets. Using Gaia DR3 as reference, well data reddening maps, spectroscopic surveys, variable monitoring we curated characterized widely Landolt Stetson collections more than 200 000 secondary...
An analytical solution for the out-of-equilibrium quasistationary states of paradigmatic Hamiltonian mean field (HMF) model can be obtained from a maximum entropy principle. The theory has been so far tested with reference to specific class initial condition, called (single-level) water-bag type. In this paper step forward is taken by considering an arbitrary number overlapping water bags. benchmarked direct microcanonical simulations performed case two-level water-bag. comparison shown...
The efficiency of the management top-class ground-based astronomical facilities supported by Adaptive Optics (AO) relies on our ability to forecast optical turbulence (OT) and a set relevant atmospheric parameters. Indeed, in spite fact that AO is able achieve, at present, excellent levels wavefront corrections (a Strehl Ratio up 90% H band), its performances strongly depend conditions. Knowing advance conditions allows an optimization use. It has already been proven it possible provide...
In this paper we quantify the performances of an automated weather forecast system implemented on Large Binocular Telescope (LBT) site at Mt. Graham (Arizona) in forecasting main atmospheric parameters close to ground. The employs a mesoscale non-hydrostatic numerical model (Meso-Nh). To validate compare forecasts wind speed, direction, temperature and relative humidity ground with respective values measured by instrumentation installed telescope dome. study is performed over large sample...
According to thermodynamics, the specific heat of Boltzmannian short-range interacting systems is a positive quantity. Less intuitive properties are instead displayed by characterized long-range interactions. In that case, sign depends on considered statistical ensemble: Negative can be found in isolated systems, which studied framework microcanonical ensemble; other hand, it generally recognized should always measured contact with thermal bath, for canonical ensemble appropriate one. We...
Water vapour in the atmosphere is main source of atmospheric opacity infrared and sub-millimetric regimes its value plays a critical role observations done with instruments working at these wavelengths on ground-based telescopes. The scheduling scientific observational programs such as VLT Imager Spectrometer for mid Infrared (VISIR) Cerro Paranal Large Binocular Telescope Interferometer (LBTI) Mount Graham would definitely benefit from ability to forecast water content. In this contribution...
The emergence of large spectroscopic surveys requires homogenising on the same scale quantities they measure in order to increase their scientific legacy. We developed SpectroTranslator, a data-driven deep neural network algorithm that can convert parameters from base one survey another. also includes method estimate importance various play conversion A B. As showcase, we apply transform effective temperature, surface gravity, metallicity, [Mg/Fe] and los velocity GALAH into APOGEE base....
The highest scientific return, for adaptive optics (AO) observations, is achieved with a reliable reconstruction of the PSF. This especially true MICADO@ELT. In this presentation, we will focus on extending MICADO PSF (PSF-R) method to off-axis case. Specifically, novel approach based temporal-based tomography AO telemetry data has been recently implemented. Results from PSF-R both simulated and real show that, at half isoplanatic angle distances, precision about 10-15% achievable in Strehl...
Context . In modern Galactic astronomy, stellar spectroscopy plays a pivotal role in complementing large photometric and astrometric surveys enabling deeper insights to be gained into the chemical evolution chemo-dynamical mechanisms at play Milky Way its satellites. Nonetheless, use of different instruments dedicated pipelines various spectroscopic can lead differences derived parameters. Aims Efforts homogenise these onto common scale are essential maximising their scientific legacy. To...
Wide Field Adaptive Optics (WFAO) systems are among the most sophisticated AO available today on large telescopes. The knowledge of vertical spatio-temporal distribution wind speed (WS) and direction (WD) fundamental to optimize performance such systems. Previous studies already proved that Gemini Multi-Conjugated system (GeMS) is able retrieve measurements WS WD stratification using SLODAR technique store in telemetry data. In order assess reliability these estimates applied a kind complex...
In this paper we present the first results ever obtained by applying autoregressive (AR) technique to precipitable water vapour (PWV). The study is performed at Very Large Telescope. AR has been recently proposed provide forecasts of atmospheric and astroclimatic parameters short time scales (up a few hours) achieving much better performances with respect 'standard forecasts' provided early afternoon for coming night. method uses real-time measurements parameter interest improve...
<i>Step 1</i> (Veillet et al.<sup>1</sup>), after a review of the development Large Binocular Telescope Observatory (LBTO from early concepts 80s to mid-2014, outlined six-year plan (LBT2020) aimed at optimizing LBTO's scientific production while mitigating consequences inevitable setbacks brought on by considerable complexity telescope and very diverse nature LBTO partnership. Step 2 is now focusing first two years implementation this plan, presenting encountered obstacles, technical,...
Due to the exponential increase in global data transfer, high-speed free space optical links between ground and satellites are increasingly being envisaged. However, availability of link is affected by atmospheric attenuation turbulence. To reliably estimate overall system performance, accurate prediction required, which implies reliable characterization local parameters. Such will help for optimal selection station network their turbulence conditions. In this contribution, we propose...
In this contribution, we present the most recent progresses obtained in context of a long-term program undertook since few years towards implementation operational forecast systems (a) on top-class ground-based telescopes assisted by AO to support flexible scheduling observational scientific programs night as well day time and (b) ground-stations free space optical communication. Two topics have been treated presented Conference AO4ELT6: 1. ALTA is an system for OT all critical atmospheric...
In this paper we study the abilities of an atmospherical mesoscale model in forecasting classical parameters relevant for astronomical applications at surface layer (wind speed, wind direction, temperature, relative humidity) on Large Binocular Telescope (LBT) site - Mount Graham, Arizona. The is carried out framework ALTA project aiming implementing automated system forecasts (Meso-Nh code) and optical turbulence (Astro-Meso-Nh service-mode operation LBT. final goal such operational tool to...