A5083381734- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- Gamma-ray bursts and supernovae
- Meteorological Phenomena and Simulations
- Geochemistry and Geologic Mapping
- Solar and Space Plasma Dynamics
- Air Quality Monitoring and Forecasting
- Astronomical and nuclear sciences
- Adaptive optics and wavefront sensing
- Advanced Frequency and Time Standards
- High-pressure geophysics and materials
- Inertial Sensor and Navigation
- Remote-Sensing Image Classification
- Geophysics and Gravity Measurements
- Infrared Target Detection Methodologies
- History and Developments in Astronomy
- Spectroscopy and Laser Applications
University of Bologna
2017-2023
University of Rome Tor Vergata
2015-2019
Astronomical Observatory of Rome
2017-2019
National Institute for Astrophysics
2017
Abstract The Vera C. Rubin Legacy Survey of Space and Time (LSST) holds the potential to revolutionize time domain astrophysics, reaching completely unexplored areas Universe mapping variability scales from minutes a decade. To prepare maximize LSST data for exploration transient variable Universe, one four pillars science, Transient Variable Stars Science Collaboration, eight Collaborations, has identified research interest requirements, paths enable them. While our roadmap is...
We present a new complete Near-Infrared (NIR, $JHK_s$) census of RR Lyrae stars (RRLs) in the globular $\omega$ Cen (NGC 5139). collected 15,472 $JHK_s$ images with 4-8m class telescopes over 15 years (2000-2015) covering sky area around cluster center 60x34 arcmin$^2$. These provided calibrated photometry for 182 out 198 RRL candidates ten to sixty measurements per band. also provide homogeneous estimates photometric amplitude 180 ($J$), 176 ($H$) and 174 ($K_s$) RRLs. data were...
Optical and microphysical cloud properties are retrieved from measurements acquired in 2013 2014 at the Concordia base station Antarctic Plateau. Two sensors used synergistically: a Fourier transform spectroradiometer named REFIR-PAD (Radiation Explorer Far Infrared-Prototype for Applications Developments) backscattering-depolarization LiDAR. First, order to identify cloudy scenes assess thermodynamic phase, spectral radiances ingested by machine learning algorithm called Cloud...
Abstract. Statistics on the occurrence of clear skies, ice clouds, and mixed-phase clouds over Concordia Station, in Antarctic Plateau, are provided for multiple timescales analyzed relation to simultaneous meteorological parameters measured at surface. Results obtained by applying a machine learning cloud identification classification (CIC) code 4 years measurements between 2012–2015 downwelling high-spectral-resolution radiances, Radiation Explorer Far Infrared – Prototype Applications...
Abstract. FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) will fly as the ninth ESA's Earth Explorer mission, an end-to-end simulator (E2ES) has been developed a support tool for mission selection process subsequent development phases. The current status of E2ES project is presented together with characterization capabilities full physics retrieval code applied to data. We show how instrument characteristics observed scene conditions impact on spectrum measured by...
We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyrae stars (RRL) at Spitzer and WISE wavelengths. The PLZ were derived using nonlinear, time-dependent convective hydrodynamical models a broad range in metal abundances (Z=0.0001 to 0.0198). In deriving the light curves, we tested two sets of atmospheric (Brott & Hauschildt 2005, Castelli Kurucz 2003) found no significant difference between resulting mean magnitudes. also compare our empirical from RRL both...
We discuss the largest and most homogeneous spectroscopic dataset of field RR Lyrae variables (RRLs) available to date. estimated abundances using both high-resolution low-resolution ({\Delta S} method) spectra for fundamental (RRab) first overtone (RRc) RRLs. The iron 7,941 RRLs were supplemented with similar literature estimates available, ending up 9,015 (6,150 RRab, 2,865 RRc). metallicity distribution shows a mean value <[Fe/H]> = -1.51\pm0.01, {\sigma}(standard deviation)= 0.41 dex...
We developed a new approach to provide accurate estimates of metal content, reddening and true distance modulus RR Lyrae stars (RRLs). The method is based on homogeneous optical ($BVI$) near-infrared ($JHK$) mean magnitudes predicted period--luminosity--metallicity relations ($IJHK$) absolute magnitude--metallicity ($BV$). obtained solutions for three different RRL samples in $\omega$ Cen: first overtone (RRc,~90), fundamental (RRab,~80) global (RRc+RRab) which the period overtones were...
Abstract. Spectral emissivity is a key property of the Earth's surface, which only very few measurements exist so far in far-infrared (FIR) spectral region, even though recent work has shown that FIR important for accurate modelling global climate. The European Space Agency's 9th Earth Explorer, FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) will provide first spectrally resolved top-of-the-atmosphere (TOA) spectrum FIR. In clear-sky conditions with low water vapour...
We present a detailed spectroscopic analysis of horizontal branch stars in the globular cluster NGC 3201. collected optical (4580-5330 A), high resolution (~34,000), signal-to-noise ratio (~200) spectra for eleven RR Lyrae and one red star with multifiber spectrograph M2FS at 6.5m Magellan telescope Las Campanas Observatory. From measured equivalent widths we derived atmospheric parameters abundance ratios {\alpha} (Mg, Ca, Ti), iron peak (Sc, Cr, Ni, Zn) s-process (Y) elements. found that...
We present a detailed spectroscopic analysis of RR Lyrae (RRL) variables in the globular cluster NGC 5139 (omega Cen). collected optical (4580-5330 A), high resolution (R = 34,000), signal-to-noise ratio (200) spectra for 113 RRLs with multi-fiber spectrograph M2FS at Magellan/Clay Telescope Las Campanas Observatory. also analysed 26,000) 122 FLAMES/GIRAFFE VLT, available ESO archive. The current sample doubles literature abundances and field Milky Way based on spectra. Equivalent width...
Abstract We collected a large data set of field RR Lyrae stars (RRLs) by using catalogs already available in the literature and Gaia DR2. estimated iron abundances for subsample 2382 fundamental RRLs (Δ S method: Ca ii K, H β , γ δ lines) which there are publicly medium-resolution SDSS-SEGUE spectra. also included similar estimates literature, ending up with largest most homogeneous spectroscopic ever (2903). The metallicity scale was validated based on high-resolution spectra RRL (V Ind),...
Airborne interferometric data, obtained from the Cirrus Coupled Cloud-Radiation Experiment (CIRCCREX) and PiknMix-F field campaign, are used to test ability of a machine learning cloud identification classification algorithm (CIC). Data comprise set spectral radiances measured by Tropospheric Fourier Transform Spectrometer (TAFTS) Research Interferometer Evaluation System (ARIES). Co-located measurements two sensors allow observations upwelling radiance for clear cloudy conditions across...
We present the first spectroscopic abundance determination of iron, alpha-elements (Si, Ca and Ti) sodium for Mira variable V1 in metal-rich globular cluster NGC 5927. use high-resolution (R~ 28,000), high signal-to-noise ratio (~200) spectra collected with WINERED, a near-infrared (NIR) spectrograph covering simultaneously wavelength range 0.91--1.35 micron. The effective temperature surface gravity at pulsation phase observation were estimated using both optical (V) NIR time-series...
The Vera C. Rubin Legacy Survey of Space and Time holds the potential to revolutionize time domain astrophysics, reaching completely unexplored areas Universe mapping variability scales from minutes a decade. To prepare maximize LSST data for exploration transient variable Universe, one four pillars science, Transient Variable Stars Science Collaboration, eight Collaborations, has identified research interest requirements, paths enable them. While our roadmap is ever-evolving, this document...
The main aim of this experiment is to provide a complete census old (t > 10 Gyr, RR Lyrae, type II Cepheids, red horizontal branch), intermediate age (red clump, Miras) and young (classical Cepheids) stellar tracers across the Galactic Bulge. To fully exploit unique photometric quality LSST images, we plan perform Shallow minisurvey (ugrizy, -20 < l 20 deg, -15 b deg) Deep (izy, -3 3 deg). former one aimed at constraining 3D structure galactic Bulge four quadrants, in particular,...
Abstract We introduce the empirical framework concerning optical and near-infrared (NIR) photometry of crowded stellar fields. In particular, we address impact that linear detectors analytical PSF played in improving accuracy precision multi-band color-magnitude diagrams (CMDs). focus our attention on recent findings based deep NIR images collected with Adaptive Optics (AO) systems at 8-10m class telescopes discuss pros cons different approaches. also estimate absolute age globular clusters...
Abstract Cepheids are excellent stellar tracers: they bright enough to be observed even at large distances; their distances can accurately determined via period-luminosity relations; spectra contain numerous lines that enable us derive abundances for many α, iron-peak or neutron-capture elements. Classical yellow supergiants trace the young populations (⩽ 300 Myr); Type II post Horizontal Branch, low-mass, Population stars (⩾ 10 Gyr). Both used purposes in Milky Way archaeology.
We present our analysis of a large sample (over 150k) candidate Galactic RR Lyrae (RRL) stars for which we derived high quality photometry at UV, optical and infrared wavelengths, using data from publicly available surveys. For sub-sample these (~2,400 fundamental mode field RRLs) have measured their individual metallicity the Delta S method, resulting in largest most homogeneous spectroscopic set collected RRLs. use this to study distribution Halo, including long-standing problem Oosterhoff...
Abstract. Spectral emissivity is a key property of the Earth surface which only very few measurements exist so far in far-infrared (FIR) spectral region, even though recent work has shown its FIR contribution important for accurate modelling global climate. The European Space Agency's 9th Explorer, FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) will provide first spectrally resolved Earth's top-of-the-atmosphere (TOA) spectrum FIR. In clear-sky conditions with low water...
Abstract. FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) will flight as the 9th ESA’s Earth Explorer mission, an End-to-End Simulator (E2ES) has been developed a support tool for mission selection process subsequent development phases. The current status of E2ES project is presented, together with characterization capabilities full physics retrieval code applied to data. We show how instrument characteristics and5the observed scene conditions impact on spectrum measured...
Abstract. Statistics on the occurrence of clear skies, ice and mixed-phase clouds over Concordia station, in Antarctic Plateau, are provided for multiple time scales analysed relation to simultaneous meteorological parameters measured at surface. Results obtained by applying a machine learning cloud identification classification code (named CIC) 4 years measurements between 2012–2105 down-welling high spectral resolution radiances, Radiation Explorer Far Infrared-Prototype Applications...