A5087567663- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astronomical and nuclear sciences
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Sesquiterpenes and Asteraceae Studies
- High-pressure geophysics and materials
- Historical Astronomy and Related Studies
- Speech Recognition and Synthesis
- Scientific Research and Discoveries
- Mass Spectrometry Techniques and Applications
- Galaxies: Formation, Evolution, Phenomena
- Molecular spectroscopy and chirality
- Reservoir Engineering and Simulation Methods
- Graph Theory and Algorithms
- Infrared Target Detection Methodologies
- Process Optimization and Integration
- Data Quality and Management
- Advanced Control Systems Optimization
- Urban Development and Societal Issues
- Biblical Studies and Interpretation
Petrobras (Brazil)
2024-2025
Agenzia Spaziale Italiana
2016-2023
Astronomical Observatory of Rome
2014-2023
National Institute for Astrophysics
2016-2022
Space (Italy)
2020-2022
University of California, Santa Cruz
2019
Politecnico di Milano
2018
University of Rome Tor Vergata
2015-2017
Instituto Politécnico Nacional
2015-2017
Universidade Estadual de Maringá
2015
Among the 160 known exoplanets, mainly detected in large radial-velocity surveys, only 8 have a characterization of their actual mass and radius thanks to two complementary methods detection: radial velocities photometric transit. We started March 2004 an exoplanet-search programme biased toward high-metallicity stars which are more frequently host extra-solar planets. This survey aims detect close-in giant planets, most likely transit star. For this programme, high-precision measured with...
The Near-Infrared Spectrometer and Photometer (NISP) on board the Euclid satellite provides multiband photometry R>=450 slitless grism spectroscopy in 950-2020nm wavelength range. In this reference article we illuminate background of NISP's functional calibration requirements, describe instrument's integral components, provide all its key properties. We also sketch processes needed to understand how NISP operates is calibrated, technical potentials limitations. Links articles providing more...
We have analyzed high-resolution and high signal-to-noise ratio optical spectra of nearby FGK stars with without detected giant planets in order to homogeneously measure their photospheric parameters, mass, age, the abundances volatile (C, N, O) refractory (Na, Mg, Si, Ca, Ti, V, Mn, Fe, Ni, Cu, Ba) elements. Our sample contains 309 from solar neighborhood (up distance 100 pc), out which 140 are dwarfs, 29 subgiants, giants. The parameters derived equivalent widths Fe I II lines. Masses ages...
We present new homogeneous measurements of Na, Al and three alpha-elements (Mg, Si, Ca) for 75 Galactic Cepheids. The abundances are based on high spectral resolution (R ~ 38,000) signal-to-noise ratio (S/N 50-300) spectra collected with UVES at ESO VLT. current were complemented Cepheid either provided by our group (75) or available in the literature, a total 439 Special attention was given providing abundance scale these five elements plus iron (Genovali et al. 2013, 2014). In addition,...
We present a detailed investigation of the Large Magellanic Cloud (LMC) disk using classical Cepheids. Our analysis is based on optical (I,V; OGLE-IV), near-infrared (NIR: J,H,Ks) and mid-infrared (MIR: w1; WISE) mean magnitudes. By adopting new templates to estimate NIR magnitudes from single-epoch measurements, we build currently most accurate, largest homogeneous multi-band dataset LMC determine Cepheid individual distances Period-Wesenheit relations (PWRs), measure geometry its viewing...
We present the star cluster catalogs for 17 dwarf and irregular galaxies in $HST$ Treasury Program "Legacy ExtraGalactic UV Survey" (LEGUS). Cluster identification photometry this subsample are similar to that of entire LEGUS sample, but special methods were developed provide robust with accurate fluxes due low statistics. The colors ages largely consistent two widely used aperture corrections, a significant fraction clusters more compact than average training cluster. However, ensemble...
Abstract We performed the largest and most homogeneous spectroscopic survey of field RR Lyraes (RRLs). secured ≈6300 high-resolution (HR, R ∼ 35,000) spectra for 143 RRLs (111 fundamental, RRab; 32 first-overtone, RRc). The atmospheric parameters were estimated by using traditional approach iron abundances measured an LTE line analysis. resulting distribution shows a well-defined metal-rich tail approaching solar abundance. This suggests that experienced complex chemical enrichment in early...
Two years ago a new benchmark for the planetary survey was set with discoveries of three extrasolar planets masses below 20$M_\oplus$. In particular, serendipitous discovery 14$M_\oplus$ planet around $μ$ Ara found HARPS semi-amplitude only 4 m s$^{-1}$ put in evidence tremendous potential search this class very low-mass planets. Aiming to discovering worlds similar b, we carried out an intensive campaign observe selected sample northern stars covering range metallicity from about solar...
We present a determination of photospheric parameters and C abundances for sample 172 G K dwarfs, subgiants, giants with without detected planets in the solar neighbourhood. The analysis was based on high S/N resolution spectra observed ELODIE spectrograph, which observational data publicly available. intend to contribute precise homogeneous studies that compare behaviour light elements stars, hosting or not. This will bring new arguments discussion possible anomalies have been suggested...
The analysis of eclipsing binaries containing non-radial pulsators allows: i) to combine two different and independent sources information on the internal structure evolutionary status components, ii) study effects tidal forces pulsations. KIC 3858884 is a bright Kepler target whose light curve shows deep eclipses, complex pulsation patterns with frequencies typical {\delta} Sct, highly eccentric orbit. We present result photometry high resolution phaseresolved spectroscopy. Spectroscopy...
Context. Classical Cepheids are the most popular distance indicators and tracers of young stellar populations. The key advantage is that they bright can be easily identified in Local Group Volume galaxies. Their evolutionary pulsation properties depend on their chemical abundances. Aims. main aim this investigation to perform a new accurate abundance analysis 20 calibrating Galactic Cepheids. We used high spectral resolution ( R ~ 40 000–115 000) S/N spectra (~400), covering entire cycle....
We report the abundances of C, Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Sm in 25 solar-type stars solar neighbourhood, their correlations with ages, kinematics, orbital parameters. The spectroscopic analysis, based high resolution S/N ratio data, was differential to Sun applied atomic line EWs C C2 spectral synthesis. performed a statistical study using tree clustering searching for groups sharing similar abundance patterns. derived Teff, log(g),...
New accurate and homogeneous optical UBVRI photometry has been obtained for variable stars in the Galactic globular $\omega$ Cen (NGC 5139). We secured 8202 CCD images covering a time interval of 24 years sky area 84x48 arcmin. The current data were complemented with available literature provided new, pulsation parameters (mean magnitudes, luminosity amplitudes,periods) 187 candidate RR Lyrae (RRLs). Among them we have 101 RRc (first overtone), 85 RRab (fundamental) single RRd (double-mode)...
Abstract We provide the largest and most homogeneous sample of α -element (Mg, Ca, Ti) iron abundances for field RR Lyrae (RRLs; 162 variables) by using high-resolution spectra. The current measurements were complemented with similar available in literature 46 RRLs brought to our metallicity scale. ended up a old ( t ≥ 10 Gyr), low-mass stellar tracers (208 RRLs: 169 fundamental, 38 first overtone, 1 mixed mode) covering 3 dex abundance (−3.00 ≤ [Fe/H] 0.24). found that are ∼0.3 more poor...
Mapping the Galactic spiral structure is a difficult task since Sun located in plane and because of dust extinction. For these reasons, molecular masers radio wavelengths have been used with great success to trace Milky Way arms. Recently, Gaia parallaxes helped investigating Solar extended neighborhood. In this paper, we propose determine location arms using Cepheids they are bright, young supergiants accurate distances (they first ladder extragalactic distance scale). They can be observed...
Context. Classical Cepheids (CCs) are solid distance indicators and tracers of young stellar populations. Dating back to the beginning 20th century, they have been safely adopted trace rotation, kinematics, chemical enrichment history Galactic thin disk. Aims. The main aim this investigation is provide iron, oxygen, sulfur abundances for largest most homogeneous sample CCs analyzed so far (1118 spectra 356 objects). current sample, containing 70 which spectroscopic metal provided first time,...
We report the discovery of a new planet candidate orbiting subgiant star HD118203 with period P=6.1335 days. The best Keplerian solution yields an eccentricity e=0.31 and minimum mass m2sin(i)=2.1MJup for planet. This has been observed ELODIE fiber-fed spectrograph as one targets in our planet-search programme biased toward high-metallicity stars, on-going since March 2004 at Haute-Provence Observatory. An analysis spectroscopic line profiles using bisectors revealed no correlation between...
In this paper, we report a refined determination of the orbital parameters and detection Rossiter-McLaughlin effect recently discovered transiting exoplanet HD 147506b (HAT-P-2b). The large eccentricity at short period is unexpected distinguishing from other known exoplanets. We performed high-precision radial velocity spectroscopic observations 147506 (HAT-P-2) with new spectrograph SOPHIE, mounted on 1.93 m telescope Haute-Provence observatory (OHP). obtained 63 measurements, including 35...
We present new accurate abundances for five neutron-capture (Y, La, Ce, Nd, Eu) elements in 73 classical Cepheids located across the Galactic thin disk. Individual are based on high spectral resolution (R ~ 38,000) and signal-to-noise ratio (S/N 50-300) spectra collected with UVES at ESO VLT DIONYSOS project. Taking account similar Cepheid provided either by our group (111 stars) or available literature, we end up a sample of 435 covering broad range iron (-1.6 < [Fe/H] 0.6). found, using...
Context. The impact of stellar mass on the properties giant planets is still not fully understood. Main-sequence (MS) stars more massive than Sun remain relatively unexplored in radial velocity (RV) surveys, due to their characteristics which hinder classical RV measurements. Aims. Our aim characterize close (up ~2 au) planet (GP) and brown dwarf (BD) population around AF MS compare this with different masses. Methods. We used S OPHIE spectrograph located 1.93 m telescope at Observatoire de...
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 have performed a new abundance analysis of Carina Red Giant (RG) stars from spectroscopic data collected with UVES (high resolution) and FLAMES/GIRAFFE medium at ESO/VLT. The former sample includes 44 RGs, while the latter consists 65 (high) ~800 (medium covering significant fraction galaxy's RG branch (RGB), red clump stars. To improve faint magnitude limit, were divided into ten surface gravity effective temperature bins. spectra belonging to same gravity/temperature bin stacked. This...
Eclipsing binary systems with pulsating components allow the determination of several physical parameters stars, such as mass and radius, that, when combined pulsation properties, can be used to constrain modeling stellar interiors evolution. Hereby, we present results study CoRoT 105906206, an eclipsing system a component located in LRc02 field. The analysis light curve was complemented by high-resolution spectra from Sandiford at McDonald Observatory FEROS ESO spectrographs, which revealed...