A5023878393- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Spacecraft Design and Technology
- Spacecraft and Cryogenic Technologies
- Sensor Technology and Measurement Systems
- Scientific Research and Discoveries
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- History and Developments in Astronomy
- Molecular Spectroscopy and Structure
- Planetary Science and Exploration
- Advanced X-ray Imaging Techniques
- High-pressure geophysics and materials
- Space Exploration and Technology
- Astronomical and nuclear sciences
Osservatorio Astronomico di Palermo
2015-2024
Chalmers University of Technology
2024
University of Florence
2012-2024
National Institute for Astrophysics
2012-2023
Sapienza University of Rome
2018-2022
Osservatorio Astronomico di Padova
2020-2022
Arcetri Astrophysical Observatory
2018-2022
University of Padua
2022
Istituto di Fotonica e Nanotecnologie
2020-2021
Brera Astronomical Observatory
2010-2020
We present the results of a new study on relationship between coronal X-ray emission and stellar rotation in late-type main-sequence stars. have selected sample 259 dwarfs range 0.5–2.0, including 110 field stars 149 members Pleiades, Hyades, α Persei, IC 2602 2391 open clusters. All been observed with ROSAT, most them photometrically-measured periods available. Our confirm that two regimes exist, one which period is good predictor total luminosity, other constant saturated to bolometric...
We use the data of Chandra Orion Ultradeep Project (COUP) to study nearly 600 X-ray sources that can be reliably identified with optically well characterized T Tauri stars (TTS) in Nebula Cluster. detect emission from more than 97% visible late-type (spectral types F M) cluster stars. This proofs there is no ``X-ray quiet'' population suppressed magnetic activity. All TTS known rotation periods lie saturated or super-saturated regime relation between activity and Rossby numbers seen for...
We analyze century‐long daily temperature and precipitation records for stations in Europe west of 60°E. A set climatic indices derived from the series, mainly focusing on extremes, is defined. Linear trends these are assessed over period 1901–2000. Average trends, 75 mostly representing 20°E, show a warming all indices. Winter has, average, warmed more (∼1.0°C/100 yr) than summer (∼0.8°C), both maximum (TX) minimum (TN) temperatures. Overall, TX winter was stronger warm tail cold (1.6 1.5°C...
Context: The current distribution of planet mass vs. incident stellar X-ray flux supports the idea that photoevaporation atmosphere may take place in close-in planets. Integrated effects have to be accounted for. A proper calculation loss rate due requires estimate total irradiation from whole XUV range. Aims: purpose this paper is extend analysis planetary atmospheres accessible X-rays mostly unobserved EUV range by using coronal models stars calculate contribution spectra. evolution...
We present the Coordinated Synoptic Investigation of NGC 2264, a continuous 30-day multi-wavelength photometric monitoring campaign on more than 1000 young cluster members using 16 telescopes. The unprecedented combination multi-wavelength, high-precision, high-cadence, and long-duration data opens new window into time domain behavior stellar objects. Here we provide an overview observations, focusing results from Spitzer CoRoT. highlight this work is detailed analysis 162 classical T Tauri...
The Telescopio Nazionale Galileo (TNG)[9] hosts, starting in April 2012, the visible spectrograph HARPS-N. It is based on design of its predecessor working at ESO's 3.6m telescope, achieving unprecedented results radial velocity measurements extrasolar planetary systems. spectrograph's ultra-stable environment, a temperature-controlled vacuum chamber, will allow under 1 m/s which enable characterization rocky, Earth-like planets. Enhancements from original HARPS include better scrambling...
ESPRESSO is the new high-resolution spectrograph of ESO's Very-Large Telescope (VLT). It was designed for ultra-high radial-velocity precision and extreme spectral fidelity with aim performing exoplanet research fundamental astrophysical experiments unprecedented accuracy. able to observe any four Unit Telescopes (UT) VLT at a resolving power 140,000 or 190,000 over 378.2 788.7 nm wavelength range, all UTs together, turning into 16-m diameter equivalent telescope in terms collecting area,...
Thousands of exoplanets have now been discovered with a huge range masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface their host star. However, essential nature these remains largely mysterious: there is no known, discernible pattern linking presence, size, or orbital parameters planet its parent We little idea whether chemistry linked formation environment, type star drives physics planet's birth, evolution. ARIEL was conceived observe number...
(abridged:) The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) surveys most populated ~5 square degrees star formation region, using X-ray observatory to study thermal structure, variability, and long-term evolution hot plasma, investigate magnetic dynamo, search for new potential members association. Many targets are also studied in optical, high-resolution grating spectroscopy has been obtained selected bright sources. spectra have coherently analyzed with two different...
We carried out a Bayesian homogeneous determination of the orbital parameters 231 transiting giant planets (TGPs) that are alone or have distant companions; we employed DE-MCMC methods to analyse radial-velocity (RV) data from literature and 782 new high-accuracy RVs obtained with HARPS-N spectrograph for 45 systems over 3 years. Our work yields largest sample exoplanet coherently determined orbital, planetary, stellar parameters. found TGPs in non-compact planetary clearly shaped by tides...
ABSTRACT Young (125 Myr), populous (>1000 members), and relatively nearby, the Pleiades has provided an anchor for stellar angular momentum models both younger older stars. We used K 2 to explore distribution of rotation periods in Pleiades. With more than 500 new members, we are vastly expanding number with periods, particularly at low-mass end. About 92% members our sample have least one measured spot-modulated period. For ∼8% without non-astrophysical effects often dominate...
(Abridged) We have used the atmospheric parameters, [alpha/Fe] abundances and radial velocities, determined from Gaia-ESO Survey GIRAFFE spectra of FGK-type stars (iDR1), to provide a chemo-kinematical characterisation disc stellar populations. focuss on subsample 1016 with high quality covering volume |Z|<4.5kpc R in range 2-13kpc. identified thin thick separation vs [M/H] plane, thanks presence low-density region number density distribution. The seem lie progressively thinner layers...
The Gaia-ESO Survey is obtaining high-quality spectroscopic data for about 10^5 stars using FLAMES at the VLT. UVES high-resolution spectra are being collected 5000 FGK-type stars. These analyzed in parallel by several state-of-the-art methodologies. Our aim to present how these analyses were implemented, discuss their results, and describe a final recommended parameter scale defined. We also precision (method-to-method dispersion) accuracy (biases with respect reference values) of...
Determining the architecture of multi-planetary systems is one cornerstones understanding planet formation and evolution. Resonant are especially important as fragility their orbital configuration ensures that no significant scattering or collisional event has taken place since earliest phase when parent protoplanetary disc was still present. In this context, TOI-178 been subject particular attention first TESS observations hinted at a 2:3:3 resonant chain. Here we report results from...
In the last 15 years different ground-based spectroscopic surveys have been started (and completed) with general aim of delivering stellar parameters and elemental abundances for large samples Galactic stars, complementing Gaia astrometry. Among those surveys, Gaia-ESO Public Spectroscopic Survey (GES), only one performed on a 8m class telescope, was designed to target 100,000 stars using FLAMES ESO VLT (both Giraffe UVES spectrographs), covering all Milky Way populations, special focus open...
Context. The Gaia-ESO Public Spectroscopic Survey is an ambitious project designed to obtain astrophysical parameters and elemental abundances for 100 000 stars, including large representative samples of the stellar populations in Galaxy, a well-defined sample 60 (plus 20 archive) open clusters. We provide internally consistent results calibrated on benchmark stars star clusters, extending across very wide range ages. This provides legacy data set intrinsic value, equally wide-ranging...
The exoplanet population characterized by relatively short orbital periods ( P < 100 d) around solar-type stars is dominated super-Earths and sub-Neptunes. However, these planets are missing in our Solar System the reason behind this absence still unknown. Two theoretical scenarios invoke role of Jupiter as possible culprit: may have acted a dynamical barrier to inward migration sub-Neptunes from beyond water iceline; alternatively, considerably reduced flux material (pebbles) required...
We present a description of the data reduction methods and derived catalog more than 1600 X-ray point sources from exceptionally deep January 2003 Chandra Observatory observation Orion Nebula Cluster embedded populations around OMC-1. The was obtained with Chandra's Advanced CCD Imaging Spectrometer (ACIS) has been nicknamed Ultradeep Project (COUP). With an 838 ks exposure made over continuous period 13.2 days, COUP provides most uniform comprehensive dataset on emission normal stars ever...
We have analyzed a number of intense X-ray flares observed in the Chandra Orion Ultradeep Project (COUP), 13 days observation Nebula Cluster (ONC). Analysis flare decay allows to determine size, peak density and magnetic field flaring structure. A total 32 events (the most powerful 1% COUP flares), sufficient statistics for analysis. broad range times (from 10 400 ks) are present sample. Peak temperatures often very high, with half sample showing excess 100 MK. Significant sustained heating...
We have developed a method based on wavelet transforms (WTs) to detect sources in astronomical images obtained with photon-counting detectors, such as X-ray images. The WT is multiscale transform that suitable for detection and analysis of interesting image features (sources) spanning range sizes. This property the particularly well suited case which point-spread function strongly varying across image, it also effective extended sources. allows one measure source count rates, sizes,...
In January 2003, the Chandra Orion Ultradeep Project (COUP) detected about 1400 young stars during a 13.2 day observation of Nebula Cluster (ONC). This paper studies well-defined sample 28 solar-mass COUP sources to characterize magnetic activity analogs Sun and thereby improve understanding effects solar X-rays on nebula era planet formation. We find that active Suns spend 70% their time in characteristic state with relatively constant flux magnetically confined plasma temperatures kT_2 =...