A5087327428- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Spacecraft Design and Technology
- Space Exploration and Technology
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Distributed and Parallel Computing Systems
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Advanced Statistical Methods and Models
- High-pressure geophysics and materials
- Inertial Sensor and Navigation
- Advanced Measurement and Metrology Techniques
- Statistical and numerical algorithms
- Blind Source Separation Techniques
Osservatorio Astrofisico di Catania
2022-2024
Osservatorio Astronomico di Padova
2007-2024
University of Padua
2006-2024
National Institute for Astrophysics
2019-2022
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
2019
Universidade do Porto
2011-2016
Centre for Astrophysics of the University of Porto
2011-2016
Institute of Astrophysics and Space Sciences
2015-2016
Max Planck Institute for Extraterrestrial Physics
2008-2011
Max Planck Society
2008-2011
Aims. We study a subset of the planetary population characterized both by HARPS and Kepler surveys. compare statistical properties planets in systems with m.sin i >5-10 M_Earth R>2 R_Earth. If we assume that underlying has same characteristics, different detection sensitivity to orbital inclination relative line sight allows us probe planets' mutual inclination. Methods. considered frequency one, two three as dictated data. used Kepler's period host mass radii distributions (corrected from...
Transmission spectroscopy during planetary transits, which is based on the measurements of variations planet-to-star radius ratio as a function wavelength, powerful technique to study atmospheric properties transiting planets. One main limitation this effects stellar activity, up until now, have been taken into account only by assessing effect non-occulted spots estimates ratio. In paper, we study, for first time, impact occultation spot and plage transmission spectra exoplanets. We...
Stellar activity features such as spots can create complications in determining planetary parameters through spectroscopic and photometric observations. The overlap of a transiting planet stellar spot, for instance, produce anomalies the transit light curves that may lead to inaccurate estimation duration, depth timing. For instance inaccuracies affect precise derivation planet's radius. In this paper, we present results quantitative study on effects high precision curves. We show spot...
We present an improved version of SOAP named "SOAP-T", which can generate the radial velocity variations and light curves for systems consisting a rotating spotted star with transiting planet. This tool be used to study anomalies inside transit Rossiter-McLaughlin effect, better constrain orbital configuration properties planetary active zones their host stars. Tests code are presented illustrate its performance validate capability when compared analytical models real data. Finally, we apply...
The Rossiter-McLaughlin (hereafter RM) effect is a key tool for measuring the projected spin-orbit angle between stellar spin axes and orbits of transiting planets. However, measured radial velocity (RV) anomalies produced by this are not intrinsic depend on both instrumental resolution data reduction routines. Using inappropriate formulas to model RM introduces biases, at least in Vsin(i) compared spectroscopic value. Currently, only iodine cell technique has been modeled, which corresponds...
Context. Precise stellar parameters are crucial in exoplanet research for correctly determining of the planetary parameters. For stars hosting a transiting planet, mass and radius depends on radius, which turn depend atmospheric Different methods can provide different results, leads to planet characteristics.}%Spectroscopic surface gravities have shown be poorly constrained, but photometry an independent measurement gravity. Aims. In this paper, we use uniform method spectroscopically derive...
Context. The detection of reflected light from an exoplanet is a difficult technical challenge at optical wavelengths. Even though this signal expected to replicate the stellar signal, not only it several orders magnitude fainter, but also hidden among noise.
Context: Exoplanets have now been proven to be very common. The number of its detections continues grow following the development better instruments and missions. One key step for understanding these worlds is their characterization, which mostly depend on host stars. Aims:We perform a significant update Stars With ExoplanETs CATalog (SWEET-Cat), unique compilation precise stellar parameters planet-host stars provided exoplanet community. Methods: We made use high-resolution spectra stars,...
The TESS mission will survey ~85 % of the sky, giving us opportunity extracting high-precision light curves millions stars, including stellar cluster members. In this work, we present our project "A PSF-based Approach to High quality data Of Stellar clusters" (PATHOS), aimed at searching and characterise candidate exoplanets variable stars in clusters using innovative method for extraction located crowded environments. Our technique light-curve involves use empirical Point Spread Functions...
Context. The ESA PLAnetary Transits and Oscillations of stars (PLATO) mission will search for terrestrial planets in the habitable zone solar-type stars. Because telemetry limitations, PLATO targets need to be pre-selected. Aims. In this paper, we present an all sky catalogue that fundamental selecting best fields most promising target stars, deriving their basic parameters, analysing instrumental performances, then planing optimising follow-up observations. This also represents a valuable...
We present new optical long-slit data along six position angles of the bulge region M 31. derive accurate stellar and gas kinematics reaching 5 arcmin from center, where disk light contribution is always less than 30%, out to 8 major axis, provides 55% total light. show that velocity dispersions McElroy (1983) are severely underestimated (by up 50 km s<sup>-1<sup/>). As a consequence, previous dynamical models have mass 31's by factor 2. further light-weighted dispersion galaxy grows 166...
We present new optical long-slit data along 6 position angles of the bulge region M31. derive accurate stellar and gas kinematics reaching 5 arcmin from center, where disk light contribution is always less than 30%, out to 8 major axis, makes 55% total light. show that velocity dispersions McElroy (1983) are severely underestimated (by up 50 km/s) previous dynamical models have mass M31's by a factor 2. Moreover, light-weighted dispersion galaxy grows 166 km/s, thus reducing discrepancy...
The scope of the project "A PSF-based Approach to TESS High Quality data Of Stellar clusters" (PATHOS) is extraction and analysis high-precision light curves stars in stellar clusters young associations for identification candidate exoplanets variable stars. cutting-edge tools used this allow us measure real flux dense fields, minimising effects due contamination by neighbour sources. We extracted about 200 000 645 open located southern ecliptic hemisphere observed during first year its...
PLATO (PLAnetary Transits and Oscillations of stars) is an ESA M-class satellite planned for launch by end 2026 dedicated to the wide-field search transiting planets around bright nearby stars, with a strong focus on discovering habitable rocky hosted solar-like stars. The choice fields be pointed at crucial task since it has direct impact scientific return mission. In this paper we describe discuss formal requirements key prioritization criteria that have taken into account in Long-duration...
[Abridged] We present a novel method to study the thermal emission of exoplanets as function orbital phase at very high spectral resolution, and apply it investigate climate ultra-hot Jupiter KELT-9b. combine 3 nights HARPS-N 2 CARMENES optical spectra, covering phases between quadratures (0.25 < phi 0.75), when planet shows its day-side hemisphere with different geometries. co-add signal thousands FeI lines through cross-correlation, which we map likelihood function. phase-dependence of:...
Context.On October 24, 2007 the periodic comet 17P/Holmes underwent an astonishing outburst that increased its apparent total brightness from magnitude V~17 up to V~2.5 in roughly two days. In this contribution we report on Wendelstein 0.8 m telescope (WST) photometric observations of early evolution stages outburst.
In this work, we investigate the problem concerning presence of additional bodies gravitationally bound with WASP-3 system. We present eight new transits planet gathered between 2009 May and 2011 September by using 30-cm telescope at Crow Observatory-Portalegre, analyse all photometric radial velocity data published so far. did not observe significant periodicities in Fourier spectrum observed minus calculated (O − C) transit timing diagrams (the highest peak having false-alarm probabilities...
In this work, we present the solution of stellar spot problem using Kelvin–Stokes theorem. Our result is applicable for any given location and dimension spots on surface. We explicitly up to second degree in limb-darkening law. This technique can be used calculate very efficiently mutual photometric effects produced by eclipsing bodies occulting construct complex shapes.
In this work, we present the analysis of 976 814 FGKM dwarf and sub-giant stars in TESS Full Frame Images (FFIs) Southern ecliptic hemisphere. We a new pipeline, DIAmante, developed to extract optimized, multi-sector photometry from FFIs classifier, based on Random Forest technique, trained discriminate plausible transiting planetary candidates common false positives. A statistical model was provide probability correct identification source variability. restricted planet search located least...
Context . Short-period giant planets ( P ≲ 10 days, M p >0.1 J ) are frequently found to be solitary compared other classes of exo-planets. Small inner companions with 15 days known only in five compact systems: WASP-47, Kepler-730, WASP-132, TOI-1130, and TOI-2000. Here, we report the confirmation TOI-5398, youngest multi-planet system composed a hot sub-Neptune (TOI-5398 c, c = 4.77271 days) orbiting interior short-period Saturn b, b 10.590547 planet, both transiting around 650 ± 150...
Abstract Nearly one million light curves from the TESS Year 1 southern hemisphere extracted Full Field Images with DIAmante pipeline are processed through AutoRegressive Planet Search statistical procedure. ARIMA models remove lingering autocorrelated noise, Transit Comb Filter identifies strongest periodic signal in curve, and a Random Forest machine-learning classifier is trained applied to identify best potential candidates. Classifier training sets based on injections of planetary...
PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end 2026 discover characterize transiting planets around bright nearby stars, in particular habitable rocky hosted solar-like stars. Over lifetime, average 8% science data rate will allocated Guest Observer programs (GOs) selected through public calls, hence it essential for community know advance where observing fields located. In a previous paper, we identified two preliminary long-pointing...