Marcello Lodi
A5041520435- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Scientific Computing and Data Management
- Advanced Frequency and Time Standards
- Particle Detector Development and Performance
- Advanced Data Storage Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Leprosy Research and Treatment
- Women's cancer prevention and management
- Dark Matter and Cosmic Phenomena
- Spectroscopy and Chemometric Analyses
- Computational Physics and Python Applications
- Pharmacovigilance and Adverse Drug Reactions
Telescopio Nazionale Galileo
2014-2023
National Institute for Astrophysics
2014-2022
Instituto do Câncer do Estado de São Paulo
2022
Osservatorio Astronomico di Palermo
2021
Rutherford Appleton Laboratory
2014-2020
Osservatorio Astronomico di Padova
2018-2020
Isaac Newton Group
2004-2018
Calar Alto Observatory
2013-2015
Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico
2015
University of Groningen
2014
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...
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...
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....
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 ASTRI Mini-Array (MA) is an INAF project to build and operate a facility study astronomical sources emitting at very high-energy in the TeV spectral band. MA consists of group nine innovative Imaging Atmospheric Cherenkov telescopes. telescopes will be installed Teide Astronomical Observatory Instituto de Astrofisica Canarias (IAC) Tenerife (Canary Islands, Spain) on basis host agreement with INAF. Thanks its expected overall performance, better than those current telescopes' arrays for...
Abstract State-of-the-art radial-velocity (RV) exoplanet searches are currently limited by RV signals arising from stellar magnetic activity. We analyze solar observations acquired over a 3 yr period during the decline of Carrington Cycle 24 to test models variation Sun-like stars. A purpose-built telescope at High Accuracy Radial-velocity Planet Searcher for Northern hemisphere (HARPS-N) provides disk-integrated spectra, which we extract RVs and <?CDATA...
Context. The existence of hot Jupiters is still not well understood. Two main channels are thought to be responsible for their current location: a smooth planet migration through the protoplanetary disk or circularization an initial highly eccentric orbit by tidal dissipation leading strong decrease in semimajor axis. Different formation scenarios result different observable effects, such as orbital parameters (obliquity and eccentricity) frequency planets at stellar ages. Aims. In context...
We present an overview of and status report on the WEAVE next-generation spectroscopy facility for William Herschel Telescope (WHT). principally targets optical ground-based follow up upcoming (LOFAR) space-based (Gaia) surveys. is a multi-object multi-IFU utilizing new 2-degree prime focus field view at WHT, with buffered pick-and-place positioner system hosting 1000 (MOS) fibres, 20 integral units, or single large IFU each observation. The fibres are fed to spectrograph, pair 8k(spectral)...
We present the Final Design of WEAVE next-generation spectroscopy facility for William Herschel Telescope (WHT), together with a status update on details manufacturing, integration and overall project schedule now that all major fabrication contracts are in place. also summary current planning behind 5-year initial phase survey operations. will provide optical ground-based follow up (LOFAR) space-based (Gaia) surveys. is multi-object multi-IFU utilizing new 2-degree prime focus field view at...
(Abridged) We perform a detailed study of the main optical activity indicators (Ca II H & K, Balmer lines, Na I D$_{\rm 1}$ 2}$, and He 3}$) measured for Sun using data provided by HARPS-N solar-telescope feed at Telescopio Nazionale Galileo. The value solar rotation period is found in all indicators, with only exception being H$\delta$. derived values vary from 26.29 days (H$\gamma$ line) to 31.23 (He I). From an analysis sliding periodograms we find that most spectral power split into...
Radial velocity (RV) searches for Earth-mass exoplanets in the habitable zone around Sun-like stars are limited by effects of stellar variability on host star. In particular, suppression convective blueshift and brightness inhomogeneities due to photospheric faculae/plage starspots dominant contribution such RVs. Gaussian process (GP) regression is a powerful tool statistically modeling these quasi-periodic variations. We investigate limits this technique using 800 days RVs from solar...
We recently demonstrated sub-m/s sensitivity in measuring the radial velocity (RV) between Earth and Sun using a simple solar telescope feeding HARPS-N spectrograph at Italian National Telescope, which is calibrated with green astro-comb. are to characterize effects of stellar (solar) RV jitter due activity on surface goal detecting signal from Venus, thereby demonstrating these instruments detect true Earth-twin exoplanets.
Abstract We present an analysis of Sun-as-a-star observations from four different high-resolution, stabilized spectrographs—HARPS, HARPS-N, EXPRES, and NEID. With simultaneous the Sun instruments, we are able to gain insight into radial velocity precision accuracy delivered by each these instruments isolate instrumental systematics that differ true astrophysical signals. solar observations, can completely characterize expected Doppler shift contributed orbiting Solar System bodies remove...
ABSTRACT Using images from the Helioseismic and Magnetic Imager aboard Solar Dynamics Observatory, we extract radial velocity (RV) signal arising suppression of convective blueshift bright faculae dark sunspots transiting rotating solar disc. We remove these rotationally modulated magnetic-activity contributions simultaneous RVs observed by HARPS-N (High Accuracy Radial Planet Searcher for Northern hemisphere) feed to produce an RV time series magnetically quiet surface (the ‘inactive-region...
GIANO is a high resolution (R50,000) IR spectrograph which provides quasi-complete coverage of the 0.95- 2.5μm wavelengths range in single exposure. The instrument was integrated and tested Arcetri-INAF (Florence, Italy) will be commisioned at 3.58m TNG Italian telescope La Palma. major scientific goals include search for rocky planets with habitable conditions around low-mass stars, quantitative spectroscopy brown dwarfs, accurate chemical abundances metallicity stars stellar clusters. This...
Aims. The inner disk of the Galaxy has a number young star clusters dominated by red supergiants that are heavily obscured dust extinction and observable only at infrared wavelengths. These important tracers recent formation chemical enrichment history in Galaxy.
GIANO is the high resolution near IR spectrograph recently commissioned at 3.58m Telescopio Nazionale Galileo in La Palma (Spain). first worldwide instrument providing cross-dispersed echelle spectroscopy a of 50,000 over 0.95 – 2.45 micron spectral range single exposure. There are outstanding science cases research fields exo-planets, Galactic stars and stellar populations that could strongly benefit from observations down to magnitude limit comparable 2MASS. The includes fully cryogenic an...
Aims Determining the intensity of lines and continuum airglow emission in H-band is important for design faint-object infrared spectrographs. Existing spectra at low/medium resolution cannot disentangle true sky-continuum from instrumental effects (e.g. diffuse light wings strong lines). We aim to obtain, first time, a high spectrum deep enough set significant constraints on between H-band. Methods During second commissioning run GIANO high-resolution spectrograph La Palma Observatory, we...
We present an update on the overall construction progress of WEAVE next-generation spectroscopy facility for William Herschel Telescope (WHT), now that all major fabrication contracts are in place. also a summary current planning behind 5-year initial phase survey operations, and some detailed end-to-end science simulations have been effected to evaluate final on-sky performance after data processing. will provide optical ground-based follow up (LOFAR) space-based (Gaia) surveys. is...
Transiting ultra-hot Jupiters are ideal candidates to study the exoplanet atmospheres and their dynamics, particularly by means of high-resolution, high signal-to-noise ratio spectra. One such object is KELT-20b, orbiting fast rotating A2-type star KELT-20. Many atomic species have already been found in its atmosphere, with blueshifted signals that hints at presence a day-to-night side wind. We aimed observe atmospheric Rossiter-McLaughlin effect Jupiter any variation signal during transit....
GIANO is an infrared (0.9-2.5 <i>μ</i>m cross-dispersed echelle spectrometer designed to achieve high resolution, throughput, wide band coverage and very stability for accurate radial velocity measurements. It also includes polarimetric capabilities a low resolution mode with <i>RS</i> ~ 400 complete 0.75-2.5 coverage. This makes it versatile, common user instrument which will be permanently mounted available on the Nasmyth-B foci of Telescopio Nazionale Galileo (TNG) located at Roque...
Context. Stellar activity is currently challenging the detection of young planets via radial velocity (RV) technique. Aims. We attempt to definitively discriminate nature RV variations for active K5 star BD+20 1790, which visible (VIS) measurements show divergent results on existence a substellar companion. Methods. compare VIS data with high precision RVs in near-infrared (NIR) range by using GIANO–B and IGRINS spectrographs. In addition, we present first time simultaneous VIS-NIR...
Aims. The Scutum complex in the inner disk of Galaxy has a number young star clusters dominated by red supergiants that are heavily obscured dust extinction and observable only at infrared wavelengths. These important tracers recent formation chemical enrichment history Galaxy.