R. Cosentino
A5068323687- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Distributed and Parallel Computing Systems
- Atmospheric Ozone and Climate
- Particle Detector Development and Performance
- Planetary Science and Exploration
- Spacecraft Design and Technology
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Infrared Target Detection Methodologies
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Photocathodes and Microchannel Plates
- Pulsars and Gravitational Waves Research
- solar cell performance optimization
- Inertial Sensor and Navigation
- Scientific Research and Discoveries
Telescopio Nazionale Galileo
2015-2024
Osservatorio Astrofisico di Catania
2014-2024
Osservatorio Astrofisico di Torino
2024
Universidad de La Laguna
2024
University of Insubria
2022
Arcetri Astrophysical Observatory
2016-2022
Brera Astronomical Observatory
2022
Queen's University Belfast
2022
National Institute for Astrophysics
2003-2021
Osservatorio Astronomico di Padova
2002-2020
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...
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...
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...
Radial velocity (RV) perturbations induced by stellar surface inhomogeneities including spots, plages and granules currently limit the detection of Earth-twins using Doppler spectroscopy. Such noise is poorly understood for stars other than Sun because their unresolved. In particular, effects on observed radial velocities are extremely difficult to characterize, thus developing optimal correction techniques extract true challenging. this paper, we present preliminary results a solar...
Kepler-93b is a 1.478 +/- 0.019 Earth radius planet with 4.7 day period around bright (V=10.2), astroseismically-characterized host star mass of 0.911+/-0.033 solar masses and 0.919+/-0.011 radii. Based on 86 radial velocity observations obtained the HARPS-N spectrograph Telescopio Nazionale Galileo 32 archival Keck/HIRES observations, we present precise estimate 4.02+/-0.68 masses. The corresponding high density 6.88+/-1.18 g/cc consistent rocky composition primarily iron magnesium...
Kepler-10b was the first rocky planet detected by Kepler satellite and con- firmed with radial velocity follow-up observations from Keck-HIRES. The mass of measured a precision around 30%, which insufficient to constrain models its internal structure composition in detail. In addition Kepler-10b, second transiting same star period 45 days sta- tistically validated, but velocities were only good enough set an upper limit 20 Mearth for Kepler-10c. To improve on b, HARPS-N Collaboration decided...
Ultra-short period (USP) planets are a class of low mass with periods shorter than one day. Their origin is still unknown, photo-evaporation mini-Neptunes and in-situ formation being the most credited hypotheses. Formation scenarios differ radically in predicted composition USP planets, it therefore extremely important to increase limited sample precise accurate density measurements. We report here characterization an planet 0.28 days around K2-141 (EPIC 246393474), validation outer 7.7...
We present here the detection of a system four low-mass planets around bright (V=5.5) and close-by (6.5 pc) star HD219134. This is first result Rocky Planet Search program with HARPS-N on TNG in La Palma. The inner planet orbits 3.0937 +/-0.0004 days, quasi-circular orbit semi-major axis 0.0382 +/- 0.0003 AU. Spitzer observations allowed us to detect transit front making HD219134b nearest known transiting date. From amplitude radial-velocity variation (2.33 0.24 m/s) observed depth (359 38...
A long-term multi-purpose observational programme has started with HARPS-N@TNG aimed to characterise the global architectural properties of exoplanetary systems. In this first paper we fully transiting system Qatar-1. We exploit HARPS-N high-precision radial velocity measurements obtained during a transit measure Rossiter-McLaughlin effect in Qatar-1 system, and out-of-transit redetermine spectroscopic orbit. New photometric light-curves are analysed characterisation host star atmospheric...
The time-variable velocity fields of solar-type stars limit the precision radial-velocity determinations their planets' masses, obstructing detection Earth twins. Since 2015 July we have been monitoring disc-integrated sunlight in daytime using a purpose-built solar telescope and fibre feed to HARPS-N stellar spectrometer. We present analyse measurements cross-correlation function (CCF) parameters obtained first 3 years observation, interpreting them context spatially-resolved observations....
We present the first detection of atomic emission lines from atmosphere an exoplanet. detect neutral iron day-side KELT-9b (Teq $\sim$ 4, 000 K). combined thousands spectrally resolved observed during one night with HARPS-N spectrograph (R 115, 000), mounted at Telescopio Nazionale Galileo. introduce a novel statistical approach to extract planetary parameters binary mask cross-correlation analysis. also adapt concept contribution function context high spectral resolution observations,...
Open cluster (OC) stars share the same age and metallicity, and, in general, their mass can be estimated with higher precision than for field stars. For this reason, OCs are considered an important laboratory to study relation between physical properties of planets those host stars, evolution planetary systems. We started observational campaign within GAPS collaboration search characterize monitored Praesepe member Pr0211 improve eccentricity Hot-Jupiter (HJ) already known orbit star...
HD 3167 is a bright (V = 8.9), nearby K0 star observed by the NASA K2 mission (EPIC 220383386), hosting two small, short-period transiting planets. Here we present results of multi-site, multi-instrument radial velocity campaign to characterize system. The masses planets are 5.02+/-0.38 MEarth for b, hot super-Earth with likely rocky composition (rho_b 5.60+2.15-1.43 g/cm^3), and 9.80+1.30-1.24 c, warm sub-Neptune substantial volatile complement (rho_c 1.97+0.94-0.59 g/cm^3). We explore...
Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, structures are shaped by environment. Young planets ($<$1 Gyr) offer an opportunity to probe the critical early stages of this evolution, where fastest. However, most known young orbit prohibitively faint stars. We present discovery two transiting HD 63433 (TOI 1726, TIC 130181866), a Sun-like ($M_*=0.99\pm0.03$) star. Through kinematics, lithium abundance, rotation, we confirm that is member Ursa...
We present the confirmation of two new planets transiting nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, $V=13.07$, $K_s=8.204$, $R_s$=0.374 R$_{\odot}$, $M_s$=0.401 M$_{\odot}$, d=22 pc). The planet candidates are identified in a single TESS sector and validated with reconnaissance spectroscopy, ground-based photometric follow-up, high-resolution imaging. With measured orbital periods $P_b=0.77$ days, $P_c=12.25$ days sizes $r_{p,b}=1.33\pm 0.07$ R$_{\oplus}$, $r_{p,c}=2.30\pm 0.16$...
Stellar magnetic activity produces time-varying distortions in the photospheric line profiles of solar-type stars. These lead to systematic errors high-precision radial-velocity measurements, which limit efforts discover and measure masses low-mass exoplanets with orbital periods more than a few tens days. We present new data-driven method for separating Doppler shifts dynamical origin from apparent velocity variations arising variability-induced changes stellar spectrum. show that...
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of solar atmosphere, from deep photosphere to upper chromosphere. Its design combines knowledge and expertise gathered by physics community during construction operation state-of-the-art telescopes operating in visible near-infrared wavelengths: Swedish 1m (SST), German Vacuum Tower (VTT) GREGOR, French T\'elescope H\'eliographique pour l'\'Etude du Magn\'etisme et des Instabilit\'es Solaires...
We present an analysis of high-dispersion spectra (R ∼ 40,000) three red clump stars in the old open cluster NGC 6819. The were obtained with SARG, spectrograph Telescopio Nazionale Galileo. analyzed using both equivalent widths measured automatic procedure and comparisons synthetic spectra. 6819 is found to be slightly metal-rich ([Fe/H] = +0.09 ± 0.03, internal error); there are no previous high-resolution studies compare. Most element-to-element abundance ratios close solar; we find a...
établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics privés.
We present iron abundance analysis for 23 wide binaries with main sequence components in the temperture range 4900–6300 K, taken from sample of pairs currently included radial velocity planet search on going at Telescopio Nazionale Galileo (TNG) using high resolution spectrograph SARG. The use a line-by-line differential technique between each pair allows us to reach errors about 0.02 dex content difference. Most have differences lower than and there are no larger 0.07 dex. four cases may be...