E. Corsaro
A5037398884- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Inertial Sensor and Navigation
- Adaptive optics and wavefront sensing
- Geological and Geophysical Studies
- Geophysics and Sensor Technology
- History and Developments in Astronomy
- Astronomical and nuclear sciences
- Scientific Research and Discoveries
- Botanical Research and Chemistry
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Geomagnetism and Paleomagnetism Studies
- Spectroscopy and Chemometric Analyses
- Chemical Thermodynamics and Molecular Structure
- Liver Disease Diagnosis and Treatment
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
Osservatorio Astrofisico di Catania
2016-2025
Instituto de Astrofísica de Canarias
2015-2019
Astrophysique, Instrumentation et Modélisation
2015-2018
CEA Paris-Saclay
2015-2018
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2018
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2018
Centre National de la Recherche Scientifique
2015-2018
Universidad de La Laguna
2015-2018
Université Paris Cité
2015-2018
Délégation Paris 7
2015-2017
We use asteroseismic data obtained by the NASA Kepler Mission to estimate fundamental properties of more than 500 main-sequence and sub-giant stars. Data during first 10 months science operations were used for this work, when these solar-type targets observed one month each in a survey mode. Stellar have been estimated using two global parameters complementary photometric spectroscopic data. Homogeneous sets effective temperatures available entire ensemble from photometry; estimates T_eff...
We have analyzed solar-like oscillations in ~1700 stars observed by the Kepler Mission, spanning from main-sequence to red clump. Using evolutionary models, we test asteroseismic scaling relations for frequency of maximum power (nu_max), large separation (Delta_nu) and oscillation amplitudes. show that difference Delta_nu-nu_max relation unevolved evolved can be explained different distributions effective temperature stellar mass, agreement with what is expected relations. For amplitudes,...
In addition to its search for extra-solar planets, the NASA Kepler Mission provides exquisite data on stellar oscillations. We report detections of oscillations in 500 solartype stars field view, an ensemble that is large enough allow statistical studies intrinsic properties (such as mass, radius and age) test theories evolution. find distribution observed masses these shows intriguing differences predictions from models synthetic populations Galaxy.
Abstract We present a methodology for the determination of empirical masses single stars through combination three direct observables with Gaia and Transiting Exoplanet Survey Satellite ( TESS ): (i) surface gravity via granulation-driven variations in light curve, (ii) bolometric flux at Earth broadband spectral energy distribution, (iii) distance parallax. demonstrate method using 525 Kepler which these measures are available literature, show that stellar can be measured this to precision...
We studied solar-like oscillations in 115 red giants the three open clusters NGC 6791, 6811, and 6819, based on photometric data covering more than 19 months with NASA's Kepler space telescope. present asteroseismic diagrams of asymptotic parameters \delta\nu_02, \delta\nu_01 \epsilon, which show clear correlation fundamental stellar such as mass radius. When populations from are compared, we see evidence for a difference giant branch stars, possibly structure clump our measurements small...
We use photometric observations of solar-type stars, made by the NASA Kepler Mission, to conduct a statistical study impact stellar surface activity on detectability solar-like oscillations. find that number stars with detected oscillations falls significantly increasing levels activity. The results present strong evidence for magnetic properties near-surface convection in which appears inhibit amplitudes stochastically excited, intrinsically damped
The unparalleled photometric data obtained by NASA's Kepler space telescope led to an improved understanding of red giant stars and binary stars. Seismology allows us constrain the properties giants. In addition eclipsing binaries, eccentric non-eclipsing exhibiting ellipsoidal modulations, have been detected with Kepler. We aim study systems containing a star derive parameters primary component. apply asteroseismic techniques determine masses radii component each system. For selected...
We present a catalog of stellar properties for large sample 6676 evolved stars with APOGEE spectroscopic parameters and \textit{Kepler} asteroseismic data analyzed using five independent techniques. Our includes evolutionary state, surface gravity, mean density, mass, radius, age, the measurements used to derive them. employ new empirical approach combining from different methods, calibrating inferred parameters, estimating uncertainties. With high statistical significance, we find that...
ABSTRACT Given the potential of ensemble asteroseismology for understanding fundamental properties large numbers stars, it is critical to determine accuracy scaling relations on which these measurements are based. From several powerful validation techniques, all indications so far show that stellar radius estimates from asteroseismic accurate within a few percent. Eclipsing binary systems hosting at least one star with detectable solar-like oscillations constitute ideal test objects...
To exploit the full potential of Kepler light curves, sophisticated and robust analysis tools are now required more than ever. Characterizing single stars with an unprecedented level accuracy subsequently analyzing stellar populations in detail fundamental to further constrain structure evolutionary models. We developed a new code, termed Diamonds, for Bayesian parameter estimation model comparison by means nested sampling Monte Carlo (NSMC) algorithm, efficient powerful method very suitable...
We present the discovery of TOI-197.01, first transiting planet identified by Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology host star is possible. TOI-197 (HIP116158) a bright (V=8.2 mag), spectroscopically classified subgiant oscillates with an average frequency about 430 muHz and displays clear signature mixed modes. The oscillation amplitude confirms that redder TESS bandpass compared to Kepler has small effect on oscillations, supporting expected yield thousands...
Abstract In the third APOKASC catalog, we present data for complete sample of 15,808 evolved stars with APOGEE spectroscopic parameters and Kepler asteroseismology. We used 10 independent asteroseismic analysis techniques anchor our system on fundamental radii derived from Gaia L T eff . provide evolutionary state, surface gravity, mass, radius, age, to derive them 12,418 stars. This includes 10,036 exceptionally precise measurements, median fractional uncertainties in <mml:math...
Asteroseismology of solar-type stars has an important part to play in the exoplanet program NASA Kepler Mission. Precise and accurate inferences on stellar properties that are made possible by seismic data allow very tight constraints be placed exoplanetary systems. Here, we outline how make estimate detectability solar-like oscillations any given target, using rough estimates temperature radius, apparent magnitude.
Stellar models generally use simple parametrizations to treat convection. The most widely used parametrization is the so-called "Mixing Length Theory" where convective eddy sizes are described using a single number, \alpha, mixing-length parameter. This free parameter, and general practice calibrate \alpha known properties of Sun apply that all stars. Using data from NASA's Kepler mission we show solar-calibrated not always appropriate, in many cases it would lead estimates initial helium...
We present the asteroseismic analysis of 1948 F-, G- and K-type main-sequence subgiant stars observed by NASA {\em Kepler Mission}. detect characterise solar-like oscillations in 642 these stars. This represents largest cohort oscillators to date. The photometric observations are analysed using methods developed nine independent research teams. results combined validate determined global parameters calculate relative precision which can be obtained. correlate number detected with stellar...
Context. Non-radial oscillations, observed in thousands of red giants by the space missions CoRoT and Kepler, allow us to greatly improve our understanding stellar structure evolution cool low-mass stars. The currently available Kepler light curves contain an outstanding amount information, but a detailed analysis individual oscillation modes power spectra, also known as peak bagging, is computationally demanding challenging perform on large number targets.
We investigate different amplitude scaling relations adopted for the asteroseismology of stars that show solar-like oscillations. Amplitudes are among most challenging asteroseismic quantities to handle because large uncertainties arise in measuring background level star's power spectrum. present results computed by means a Bayesian inference on sample 1640 observed with Kepler, spanning from main sequence red giant stars, 12 models used predictions and exploiting recently well-calibrated...
We analyze the photometric short-cadence data obtained with Kepler mission during first 8 months of observations two solar-type stars spectral types G and F: KIC 11395018 11234888, respectively, latter having a lower signal-to-noise ratio (S/N) compared former. estimate global parameters acoustic (p) modes such as average large small frequency separations, maximum p-mode envelope, line width modes. were able to identify measure 22 frequencies for star 16 second one even though S/N these are...
Aims. We present a detailed study of the two Sun-like stars KIC 7985370 and 7765135, to determine their activity level, spot distribution, differential rotation. Both were previously discovered by us be young observed NASA Kepler mission.
The internal structures and properties of oscillating red-giant stars can be accurately inferred through their global oscillation modes (asteroseismology). Based on 1460 days Kepler observations we perform a thorough asteroseismic study to probe the stellar parameters evolutionary stages three red giants in eclipsing binary systems. We present first detailed analysis individual components KIC 8410637, KIC5640750 KIC9540226. obtain estimates masses, radii, mean densities logarithmic surface...
We present a novel method for estimating lower-limit surface gravities (log g) of Kepler targets whose data do not allow the detection solar-like oscillations. The is tested using an ensemble solar-type stars observed in context Asteroseismic Science Consortium. then proceed to estimate log g cohort planet-candidate host with no detected Limits on fundamental stellar properties, as provided by this work, are likely be useful characterization corresponding candidate planetary systems....