G. Lo Curto
A5085280806- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Adaptive optics and wavefront sensing
- Advanced Fiber Laser Technologies
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Advanced Fiber Optic Sensors
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Advanced Frequency and Time Standards
- Planetary Science and Exploration
- Photonic Crystal and Fiber Optics
- X-ray Spectroscopy and Fluorescence Analysis
European Southern Observatory
2014-2024
European Southern Observatory
2012-2024
Brera Astronomical Observatory
2010
Institut de Planétologie et d'Astrophysique de Grenoble
2009
Instituto de Astrofísica de Canarias
2009
Uppsala University
2006-2007
University of Maryland, College Park
2005
University of Liège
2005
Pomona College
2005
University of Hawaiʻi at Mānoa
2005
We report on the results of an 8-year survey carried out at La Silla Observatory with HARPS spectrograph to detect and characterize planets in super-Earth Neptune mass regime. The size our star sample precision achieved have allowed detection a sufficiently large number low-mass study statistical properties their orbital elements, correlation host-star metallicity planet masses, as well occurrence rate planetary systems around solar-type stars. A robust estimate frequency shows that more...
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,...
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...
Proxima Centauri is the closest star to Sun. This small, low-mass, mid M dwarf known host an Earth-mass exoplanet with orbital period of 11.2 days within habitable zone, as well a long-period planet candidate close 5 years. We report on analysis large set observations taken ESPRESSO spectrograph at VLT aimed thorough evaluation presence third low-mass planetary companion, which started emerging during previous campaign. Radial velocities (RVs) were calculated using both cross-correlation...
Abstract The two-planet transiting system LHS 1140 has been extensively observed since its discovery in 2017, notably with Spitzer, HST, TESS, and ESPRESSO, placing strong constraints on the parameters of M4.5 host star small temperate exoplanets, b c. Here, we reanalyze ESPRESSO observations novel line-by-line framework designed to fully exploit radial velocity content a stellar spectrum while being resilient outlier measurements. improved velocities, combined updated parameters,...
We combine results from interferometry, asteroseismology and spectroscopy to determine accurate fundamental parameters of 23 bright solar-type stars, spectral type F5 K2 luminosity classes III–V. For some stars we can use direct techniques the mass, radius, effective temperature, compare with indirect methods that rely on photometric calibrations or spectroscopic analyses. asteroseismic information available in literature infer an mass accuracy 4–15 per cent. From radius 3 find evidence...
In this letter we present the discovery of a very light planetary companion to star μ Ara (HD 160691). The planet orbits its host once every 9.5 days, and induces sinusoidal radial velocity signal with semi-amplitude 4.1 m s-1, smallest Doppler amplitude detected so far. These values imply mass 14 (Earth-masses). This detection represents slightly smaller than that Uranus, "ice giant" in our Solar System. Whether can be considered an ice giant or super-earth is discussed context...
ESPRESSO, the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations, will combine efficiency of modern echelle spectrograph design with extreme radial-velocity precision. It be installed on ESO's VLT in order to achieve a gain two magnitudes respect its predecessor HARPS, instrumental radialvelocity precision improved reach cm/s level. Thanks characteristics ability combining incoherently light 4 large telescopes, ESPRESSO offer new possibilities various fields...
Context. Low-mass extrasolar planets are presently being discovered at an increased pace by radial velocity and transit surveys, opening a new window on planetary systems. Aims. We conducting high-precision survey with the HARPS spectrograph which aims characterizing population of ice giants super-Earths around nearby solar-type stars. This will lead to better understanding their formation evolution, yield global picture systems from gas down telluric planets. Methods. Progress has been...
Abstract We present the first stringent tests of a novel calibration system based on laser frequency comb (LFC) for radial velocity measurements. The were obtained with high-resolution, optical spectrograph, High Accuracy Radial Planet Searcher. By using only one echelle order, we obtain repeatability 15cms−1 exposures that are several hours apart. This is comparable simultaneous Th–Ar lamp makes use all 72 orders. In both cases, residuals compatible computed photon noise. Averaging LFC...
WASP-121b is one of the most studied Ultra-hot Jupiters: many recent analyses its atmosphere report interesting features at different wavelength ranges. In this paper we analyze transit acquired with high-resolution spectrograph ESPRESSO VLT in 1-telescope mode, and partial taken during commissioning instrument 4-telescope mode. We investigate anomalous in-transit radial velocity curve study transmission spectrum planet. By analysing velocities were able to infer presence atmospheric...
Context. The search for planets orbiting metal-poor stars is of utmost importance our understanding planet formation models. However, no dedicated searches have been conducted so far very low mass such objects. Only a few cases low-mass are thus known. Amongst these, HD 41248 metal-poor, solar-type star on the orbit which resonant pair super-Earth-like has announced. This detection was based 62 radial velocity measurements obtained with HARPS spectrograph (public data).
We aim to confirm the presence of Proxima b using independent measurements obtained with new ESPRESSO spectrograph, and refine planetary parameters taking advantage its improved precision. analysed 63 spectroscopic observations taken during 2019. radial velocity a typical photon noise 26 cm/s. ran joint MCMC analysis on time series full-width half maximum cross-correlation function model stellar signals present in data, applying Gaussian process regression deal activity. independently data....
We present the analysis of entire HARPS observations three stars that host planetary systems: HD1461, HD40307, and HD204313. The data set spans eight years contains more than 200 nightly averaged velocity measurements for each star. This means it is sensitive to both long-period low-mass planets also effects induced by stellar activity cycles. modelled using Keplerian functions correspond candidates included short- long-term magnetic activity. A Bayesian approach was taken modelling, which...
The advent of a new generation radial velocity instruments has allowed us to break the one Earth-mass barrier. We report milestone in this context with detection lowest-mass planet measured so far using velocities: L 98-59 b, rocky half mass Venus. It is part system composed three known transiting terrestrial planets (planets b d). announce discovery fourth nontransiting minimum 3.06_{-0.37}^{+0.33} MEarth and an orbital period 12.796_{-0.019}^{+0.020} days indications for presence fifth...
We observed two transits of the iconic gas giant HD 209458b between 380 and 780 nm, using high-resolution ESPRESSO spectrograph. The derived planetary transmission spectrum exhibits features at all wavelengths where parent star shows strong absorption lines, for example, NaI, MgI, FeI, FeII, CaI, VI, H$\alpha$, KI. interpreted these as signature deformation stellar line profiles due to Rossiter-McLaughlin effect, combined with centre-to-limb effects on surface, which is in agreement similar...
We report on the first extra-solar planet discovered with brand new HARPS instrument. The is a typical "hot Jupiter" and an orbital period of 3.39 days, but from photometric follow-up its parent star HD 330075 we can exclude presence transit. induced radial-velocity variations exceed 100 m s-1 in semi-amplitude are easily detected by state-of-the-art spectro-velocimeters. Nevertheless, faint magnitude () benefits efficient instrument: less than 10 observing nights 3 h total integration time...