Marco Buttu
A5002939555- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Antenna Design and Optimization
- Astrophysics and Star Formation Studies
- Superconducting and THz Device Technology
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Parallel Computing and Optimization Techniques
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- GNSS positioning and interference
- Interconnection Networks and Systems
- Satellite Communication Systems
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Embedded Systems Design Techniques
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Music Technology and Sound Studies
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
Osservatorio Astronomico di Cagliari
2012-2024
Osservatorio astronomico di Bologna
2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2022
Osservatorio di Astrofisica e Scienza dello Spazio
2022
Concordia University Wisconsin
2022
University of Cagliari
2008
We report the discovery and characterisation of a pair sub-Neptunes transiting bright K-dwarf TOI-1064 (TIC 79748331), initially detected in TESS photometry. To characterise system, we performed retrieved CHEOPS, TESS, ground-based photometry, HARPS high-resolution spectroscopy, Gemini speckle imaging. host star determine $T_{\rm eff, \star}=4734\pm67$ K, $R_{\star}=0.726\pm0.007$ $R_{\odot}$, $M_{\star}=0.748\pm0.032$ $M_{\odot}$. present novel detrending method based on PSF shape-change...
[Abridged] The Sardinia Radio Telescope (SRT) is the new 64-m dish operated by INAF (Italy). Its active surface will allow us to observe at frequencies of up 116 GHz. At moment, three receivers, one per focal position, have been installed and tested. SRT was officially opened in October 2013, upon completion its technical commissioning phase. In this paper, we provide an overview main science drivers for SRT, describe outcomes from scientific telescope, discuss a set observations...
In the period 2012 June - 2013 October, Sardinia Radio Telescope (SRT) went through technical commissioning phase. The characterization involved three first-light receivers, ranging in frequency between 300MHz and 26GHz, connected to a Total Power back-end. It also tested employed telescope active surface installed main reflector of antenna. instrument status performance proved be good agreement with expectations terms panels alignment (at present 300 um rms improved microwave holography),...
Abstract Astronomers do not have a complete picture of the effects wide-binary companions (semimajor axes greater than 100 au) on formation and evolution exoplanets. We investigate these using new data from Gaia Early Data Release 3 Transiting Exoplanet Survey Satellite mission to characterize systems with transiting identify sample 67 exoplanet candidates (with well-determined, edge-on orbital inclinations) that reside in wide visual binary systems. derive limits parameters for measure...
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and 38. is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with mass $0.68\pm0.05$ M$_{\odot}$ radius $0.67\pm0.01$ R$_{\odot}$. obtain photometric follow-up observations variety facilities, we use these data-sets to determine that inner planet, b, $1.70\pm0.07$ R$_{\oplus}$ super-Earth in 3.82 day orbit,...
Abstract We present the spectroscopic confirmation and precise mass measurement of warm giant planet TOI-199 b. This was first identified in TESS photometry confirmed using ground-based from ASTEP Antarctica including a full 6.5 hr long transit, PEST, Hazelwood, LCO; space NEOSSat; radial velocities (RVs) FEROS, HARPS, CORALIE, CHIRON. Orbiting late G-type star, b has <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>104.854</mml:mn>...
Abstract We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. b is large ( R = <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>1.580</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.070</mml:mn> <mml:mo>+</mml:mo> <mml:mn>0.074</mml:mn> </mml:msubsup> </mml:math> J ) on highly eccentric e...
As feature sizes decrease, power dissipation and heat generation density exponentially increase. Thus, temperature gradients in Multiprocessor Systems on Chip (MPSoCs) can seriously impact system performance reliability. Thermal balancing policies based task migration have been proposed to modulate distribution between processing cores achieve flattening. However, the context of MPSoC for multimedia streaming computing, where timeliness is critical, quality service must be carefully...
In 2016 September, the microquasar Cygnus X-3 underwent a giant radio flare, which was monitored for 6 d with Medicina Radio Astronomical Station and Sardinia Telescope. Long observations were performed in order to follow evolution of flare on an hourly scale, covering six frequency ranges from 1.5 25.6 GHz. The emission reached maximum 13.2 ± 0.7 Jy at 7.2 GHz 10 1 18.6 Rapid flux variations observed high frequencies peak together rapid spectral index: α steepened 0.3 0.6 (with Sν ∝ ν−α)...
We report on the discovery and characterisation of three planets orbiting F8 star HD~28109, which sits comfortably in \tess's continuous viewing zone. The two outer have periods $\rm 56.0067 \pm 0.0003~days$ 84.2597_{-0.0008}^{+0.0010}~days$, implies a period ratio very close to that first-order 3:2 mean motion resonance, exciting transit timing variations (TTVs) up 60\,mins$. These were first identified by \tess, we third planet \textcolor{black}{\tess photometry} with 22.8911 0.0004~days$....
Observations of supernova remnants (SNRs) are a powerful tool for investigating the later stages stellar evolution, properties ambient interstellar medium, and physics particle acceleration shocks. For fraction SNRs, multi-wavelength coverage from radio to ultra high-energies has been provided, constraining their contributions production Galactic cosmic rays. Although emission is most common identifier SNRs prime probe refining models, high-resolution images at frequencies above 5 GHz...
As feature sizes decrease, power dissipation and heat generation density exponentially increase. Thus, temperature gradients in multiprocessor systems on chip (MPSoCs) can seriously impact system performance reliability. Thermal balancing policies based task migration have been proposed to modulate distribution between processing cores achieve flattening. However, the context of MPSoC for multimedia streaming computing, where timeliness is critical, quality service must be carefully...
The Sardinia Radio Telescope is approaching to its official inauguration. Nowadays, the technical staff accomplishing last remaining activities set up and integrate microwave receivers, digital processing systems all equipment necessary reach a top level in international scenario of large radio telescopes. Even if telescope still along commissioning, SRT has already performed first astronomical detection. This early scientific result opens exciting perspectives for time when will be full...
Solaris is a scientific and technological project aimed at the development of smart Solar monitoring system high radio frequencies, based on single-dish imaging techniques. It combines implementation dedicated interchangeable high-frequency receivers existing small telescope systems (1.5/2.6m class) available in our laboratories Antarctica, to be adapted for observations. can perform observations nearly 20h/day during Antarctic summer with optimal sky opacity, it will only facility offering...
The Sardinia Radio Telescope (SRT) is a new 64-meter shaped antenna designed to carry out observations up 100 GHz. This large instrument has been built in Sardinia, 35 km north of Cagliari, and now facing the technical commissioning phase. paper describes architecture, implementation solutions development status NURAGHE, SRT control software. Aim project was produce software which reliable, easy keep date flexible against other telescopes. most ambitious goal will be install NURAGHE at all...
The Sardinia Radio Telescope (SRT) is a new 64-metre, Gregorian-shaped antenna built in (Italy). It designed to carry out observations up 100 GHz. telescope provided with six focal positions: primary, Gregorian and four beam-waveguide foci. This paper describes the project of servo system which allows focus receiver selection during instrument setup. also operates, at observation stage, compensation some stucture deformations due gravity, temperature variations other environmental effects....
Photometric monitoring of Beta Pictoris in 1981 showed anomalous fluctuations up to 4% over several days, consistent with foreground material transiting the stellar disk. The subsequent discovery gas giant planet b and predicted transit its Hill sphere within 0.1 au projected distance provided an opportunity search for a circumplanetary disk this $21\pm 4$ Myr-old planetary system. Continuous broadband photometric requires ground-based observatories at multiple longitudes provide redundancy...
Existing radio receivers have a very low noise temperature. To further increase the observation speed, new generation of use multi-beam focal plane array (FPA) together with wide bandwidth. In this article, we present front-end and cryogenic design 7-beam FPA double linear polarization receiver for 64-m primary focus Sardinia Radio Telescope. At end show simulated performances measurements down-conversion section.
The Sardinia Radio Telescope (SRT) is a 64-m fully-steerable radio telescope. It provided with an active surface to correct for gravitational deformations, allowing observations from 300 MHz 100 GHz. At present, three receivers are available: coaxial LP-band receiver (305-410 and 1.5-1.8 GHz), C-band (5.7-7.7 GHz) 7-feed K-band (18-26.5 GHz). Several back-ends also available in order perform the different data acquisition analysis procedures requested by scientific projects. design...
The noise temperature of existing radio telescope receivers has actually achieved very low values. In any case, there are other practical ways to increase the observational speed a single dish antennas without using longer integration time: observe with multi-beam and large bandwidth receiver. this paper we present front end cryogenic dewar design 5 beams FPA double linear polarization receiver for primary focus 64 m Sardinia Radio Telescope.
Abstract As an all-sky survey, NASA’s Transiting Exoplanet Survey Satellite (TESS) mission is able to detect the brightest and rarest types of transiting planetary systems, including young planets that enable study evolutionary processes occur within first billion years. Here we report discovery a young, multiplanet system orbiting bright K4.5V star, TOI-712 ( V = 10.838, <?CDATA ${M}_{\star }={0.733}_{-0.025}^{+0.026}\,{M}_{\odot }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The Sardinia Radio Telescope (SRT) is a new 64-m across radio astronomical facility located in Sardinia, Italy, and operated by the National Institute for Astrophysics (INAF). It can operate on broad frequency range -300 MHz to 115 GHz, equipped with three different focus solutions: primary, Gregorian, four Beam Wave Guide foci. primary mirror an active surface able compensate gravitational stress variations at elevations keeps antenna gain flat optimal any elevation, as proven regular...
The software maintenance typically requires 40-80% of the overall project costs, and this considerable variability mostly depends on internal quality: more is designed implemented to constantly welcome new changes, lower will be costs. quality enforced through testing, which in turn also affects development This reason why testing methodologies have become a major concern for any company that builds - or involved building software. Although there no approach suits all contexts, we infer some...