D. Barbato
A5013077678- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Planetary Science and Exploration
- Atmospheric aerosols and clouds
- Ionosphere and magnetosphere dynamics
- Gallbladder and Bile Duct Disorders
- Earth Systems and Cosmic Evolution
- Appendicitis Diagnosis and Management
- Sodium Intake and Health
- Economic Growth and Productivity
- Remote Sensing in Agriculture
- Biliary and Gastrointestinal Fistulas
- Fatty Acid Research and Health
- Inertial Sensor and Navigation
- SAS software applications and methods
Osservatorio Astronomico di Padova
2024
Osservatorio Astrofisico di Torino
2018-2023
University of Geneva
2020-2023
Ospedale Buon Consiglio Fatebenefratelli
2022
Fatebenefratelli Hospital
2022
University of Turin
2018-2020
Max Planck Society
2018-2019
Max Planck Institute for Astronomy
2019
Astrometric discovery of sub-stellar mass companions orbiting stars is exceedingly hard due to the required sub-milliarcsecond precision, limiting application this technique only a few instruments on target-per-target basis as well global astrometry space missions Hipparcos and Gaia. The third Gaia data release includes first astrometric orbital solutions, whose sensitivity in terms estimated companion extends down into planetary-mass regime. We present contribution `exoplanet pipeline' DR3...
Proxima could host a planet on ∼5-year orbit, which Gaia can confirm in the near future providing its exact mass.
The assessment of the frequency planetary systems reproducing Solar System's architecture is still an open problem. Detailed study multiplicity and generally hampered by limitations in quality, temporal extension observing strategy, causing difficulties detecting low-mass inner planets presence outer giant bodies. We present results high-cadence high-precision HARPS observations on 20 solar-type stars known to host a single long-period planet order search for additional companions estimate...
In the framework of GAPS project, we observed planet-hosting star KELT-9 (A-type star, VsinI$\sim$110 km/s) with HARPS-N spectrograph at TNG. this work analyse spectra and extracted radial velocities (RVs), to constrain physical parameters system detect planetary atmosphere KELT-9b. We from high-resolution optical mean stellar line profiles an analysis based on Least Square Deconvolution technique. Then, computed RVs a method optimized for fast rotators, by fitting profile purely rotational...
WASP-103b is the exoplanet with highest expected deformation signature in its transit light curve and one of shortest spiral-in times. Measuring tidal planet would allow us to estimate second degree fluid Love number gain insight into planet's internal structure. Moreover, measuring decay timescale stellar quality factor, which key constraining physics. We obtained 12 curves CHEOPS this extreme system. modelled high-precision together systematic instrumental noise using multi-dimensional...
Observations of companions solar-type stars in nearby young moving groups (NYMGs) show that they split into two groups: stellar and brown dwarf (mass ratio q>0.05) Jupiter-like (JL) planets (q<0.02). The frequency JL NYMGs appears to be higher than obtained from radial velocity (RV) surveys. We extended the search for three clusters intermediate age: Hyades, Coma Berenices, Ursa Major. They are older formed more massive events NYMGs. sample host is complete core clusters, while we...
Observations of companions solar-type stars in nearby young moving groups (NYMGs) show that they split into two groups: stellar and brown dwarf (mass ratio $q>0.05$) Jupiter-like (JL) planets ($q<0.02$). The frequency JL NYMGs appears to be higher than obtained from radial velocity (RV) surveys. We extended the search for three clusters intermediate age: Hyades, Coma Berenices, Ursa Major. They are older formed more massive events NYMGs. sample host is complete core clusters, while we...
Context . The formation mechanisms of stellar, brown dwarf, and planetary companions, their dependencies on the environment interactions with each other are still not well established. Recently, combining high-contrast imaging space astrometry we found that Jupiter-like (JL) planets frequent in β Pic moving group (BPMG) around those stars where orbit can be stable, prompting further analysis discussion. Aims We broaden our previous to young nearby associations determine frequency, mass...
A historical planet-search on a sample of 1647 nearby southern main sequence stars has been ongoing since 1998 with the CORALIE spectrograph at La Silla Observatory, backup subprogram dedicated to monitoring binary stars. We review 25 years measurements and search for Doppler signals consistent stellar or brown dwarf companions produce an updated catalog both known previously unpublished in sample, assessing binarity fraction population providing perspective more precise sample. perform new...
Aim: We aim to refine the orbital and physical parameters determine sky-projected planet obliquity of five eccentric transiting planetary systems: HAT-P-15, HAT-P-17, HAT-P-21, HAT-P-26, HAT-P-29. Each systems hosts a hot Jupiter, except for HAT-P-26 which Neptune-mass planet. Methods: observed transit events these planets with HARPS-N spectrograph, obtaining high-precision radial velocity measurements that allow us measure Rossiter-McLaughlin effect each target systems. used new spectra...
Context. The leading spectrographs used for exoplanets’ search and characterization offer online data reduction softwares (DRS) that yield, as an ancillary result, the full-width at half-maximum (FWHM) of cross-correlation function (CCF) is to estimate radial velocity host star. FWHM also contains information on stellar projected rotational v eq sin i ★ , if appropriately calibrated. Aims. We wanted establish a simple relationship derive directly from computed by HARPS-N DRS in case...
We perform a homogeneous search for and analysis of optical occultations phase variations the most favorable ultra-short-period (USP) ($P<1$~d) sub-Neptunes ($R_{p}<4 R_{\oplus}$) observed by $\textit{Kepler}$ K2, with aim better understanding their nature. first selected 16 K2 USP sub-Neptunes, based on expected occultation signal. filtered out stellar variability in light curves, using sliding linear fitting and, when required, more sophisticated approach Gaussian Process regression....
In the framework of Global Architecture Planetary Systems (GAPS) project we collected more than 300 spectra with HARPS-N at TNG for bright G9V star HD164922. This target is known to host one gas giant planet in a wide orbit (Pb~1200 days, semi-major axis ~2 au) and Neptune-mass period Pc ~76 days. We searched additional low-mass companions inner region system. compared radial velocities (RV) activity indices derived from time series measure rotation used Gaussian process regression describe...
We present broad-band photometry of 30 planetary transits the ultra-hot Jupiter KELT-16b, using five medium-class telescopes. The were monitored through standard B, V, R, I filters and four simultaneously observed from different places, for a total 36 new light curves. used these photometric data those TESS space telescope to review main physical properties KELT-16 system. Our results agree with previous measurements but are more precise. estimated mid-transit times each combined them others...
Context. With the growth of comparative exoplanetology, it is increasingly clear that relationship between inner and outer planets plays a key role in unveiling mechanisms governing formation evolution models. For this reason, important to probe region systems hosting long-period giants search undetected lower mass planetary companions. Aims. We aim present results high-cadence high-precision radial velocity (RV) monitoring three late-type dwarf stars with well-measured orbits order for...
Context. The observed scarcity of brown dwarfs in close orbits (within 10 au) around solar-type stars has posed significant questions about the origins these substellar companions. These not only pertain to but also impact our broader understanding planetary formation processes. However, resolve mechanisms, accurate observational constraints are essential. Notably, most have been discovered by radial velocity surveys, this method introduces uncertainties due its inability determine orbital...
Context. With the growth of comparative exoplanetology, it is becoming increasingly clear that investigating relationships between inner and outer planets plays a key role in discriminating competing formation evolution models. To do so, important to probe region systems host long-period giants search undetected lower-mass planetary companions. Aims. In this work, we present our results on K-dwarf star BD-11 4672, which already known giant planet, as first output subsample GAPS programme...
ABSTRACT We present rotation period measurements for 107 M dwarfs in the mass range $0.15\!-\!0.70 \, \mathrm{M}_\odot$ observed within context of APACHE photometric survey. measure periods 0.5–190 d, with distribution peaking at ∼30 d. revise stellar masses and radii our sample rotators by exploiting Gaia DR2 data. For ${\sim}20{{\ \rm per\ cent}}$ sample, we compare those derived from different spectroscopic indicators, finding good correspondence most cases. to one obtained Kepler survey...
Statistical studies of exoplanets have shown that giant planets are more commonly hosted by metal-rich dwarf stars than low-metallicity ones, while such a correlation is not evident for lower-mass planets. The search around metal-poor and the estimate their occurrence $f_p$ an important element in providing support to models planet formation. We present results from HARPS-N orbiting ($-1.0\leq[Fe/H]\leq-0.5$ dex) northern hemisphere complementing previous HARPS survey on southern order...
The search for Earth-like planets around Sun-like stars and the evaluation of their occurrence rate is a major topic research exoplanetary community. Two key characteristics in defining planet as 'Earth-like' are having radius between 1 1.75 times Earth's orbiting inside host star's habitable zone; measurement planet's related error however possible only via transit observations highly dependent on precision radius. A improvement determination stellar represented by unprecedented parallax...
Astrometric discovery of sub-stellar mass companions orbiting stars is exceedingly hard due to the required sub-milliarcsecond precision, limiting application this technique only a few instruments on target-per-target basis as well global astrometry space missions Hipparcos and Gaia. The third Gaia data release includes first astrometric orbital solutions, whose sensitivity in terms estimated companion extends down into planetary-mass regime. We present contribution `exoplanet pipeline' DR3...