A5089174943- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Advanced Chemical Physics Studies
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Stellar, planetary, and galactic studies
- Mesoporous Materials and Catalysis
- Spacecraft Design and Technology
- Fullerene Chemistry and Applications
- Isotope Analysis in Ecology
- Advanced Battery Materials and Technologies
- Space Exploration and Technology
- Sensor Technology and Measurement Systems
- Electrophoretic Deposition in Materials Science
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Catalytic Processes in Materials Science
- Atmospheric chemistry and aerosols
- Microfluidic and Capillary Electrophoresis Applications
- Radioactive contamination and transfer
- Transportation Safety and Impact Analysis
- Maritime Navigation and Safety
Instituto de Ciencia de Materiales de Madrid
2019-2024
Osservatorio Astrofisico di Catania
2012-2024
National Institute for Astrophysics
2015-2024
Institute for Space Astrophysics and Planetology
2015-2018
Parthenope University of Naples
2008-2015
University of Catania
2009-2013
CY Cergy Paris Université
2010-2013
Centre National de la Recherche Scientifique
2010-2013
Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
2009-2012
Sorbonne Université
2010
Critical measurements for understanding accretion and the dust/gas ratio in solar nebula, where planets were forming 4.5 billion years ago, are being obtained by GIADA (Grain Impact Analyser Dust Accumulator) experiment on European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 3.4 astronomical units inbound, OSIRIS (Optical, Spectroscopic, Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, 48 10(-5)...
ABSTRACT The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10 −10 kg by means the GIADA collector and OSIRIS Wide Angle Camera Narrow since 2014 August will continue until 2016 September. Detections single allow us to estimate anisotropic flux from 67P, infer loss rate size distribution at surface sunlit nucleus, see whether 67P evolves in time. velocity orbiter, relative is much lower measured GIADA,...
The Grain Impact Analyzer and Dust Accumulator (GIADA) instrument on board ESA's Rosetta mission is constraining the origin of dust particles detected within coma comet 67 P/Churyumov–Gerasimenko (67P). collected belong to two families: (i) compact (ranging in size from 0.03 1 mm), witnessing presence materials that underwent processing solar nebula (ii) fluffy aggregates 0.2 2.5 mm) sub-micron grains may be a record primitive component, probably linked interstellar dust. dynamics constrain...
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Context. During the period between 15 September 2014 and 4 February 2015, Rosetta spacecraft accomplished circular orbit phase around nucleus of comet 67P/Churyumov-Gerasimenko (67P). The Grain Impact Analyzer Dust Accumulator (GIADA) onboard monitored 67P coma dust environment for entire period.
Comet 67P/Churyumov-Gerasimenko (67P hereinafter) is characterized by a dust transfer from the southern hemi-nucleus to night-side northern deposits, which constrains dust-to-ices mass ratio inside nucleus values factor of 2 larger than that provided lost gas and non-volatiles. This applies all comets because density in night comae cannot prevent fallback. Taking into account Grain Impact Analyser Dust Accumulator (GIADA) data collected during entire Rosetta mission, we update average bulk...
The formation of water molecules from the reaction between ozone (O3) and D-atoms is studied experimentally for first time. Ozone deposited on non-porous amorphous solid ice (H2O), are then sent onto sample held at 10 K. HDO detected during desorption whole substrate where isotope mixing takes place, indicating that synthesis has occurred. efficiency via hydrogenation same order magnitude found reactions involving O atoms or O2 exhibits no apparent activation barrier. These experiments...
We present the results of an experimental study on interaction atomic deuterium with coronene films. The effects D atom irradiation have been analyzed infrared spectroscopy. spectral changes provide evidence for deuteration outer edge C sites via a addition reaction. A cross section 1.1 Å2 is estimated process coronene. HD and D2 molecules form, through abstraction reactions, deuterated 0.06 Å2. magnitude both sections in line Eley–Rideal type process. show that hydrogenated neutral...
GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure momentum, mass speed of individual dust particles escaping nucleus comet 67P/Churyumov–Gerasimenko (hereafter 67P). From 2014 August 2016 June, escorted 67P during its journey around Sun. Here, we focus on data taken between 2015 January February which included 67P's perihelion passage. To better understand cometary activity more specifically presence structures in comae, mapped spatial...
Any evolving system can change state via thermal mechanisms (hopping a barrier) or quantum tunneling. Most of the time, efficient classical dominate at high temperatures. This is why an increase temperature initiate chemistry. We present here experimental investigation O-atom diffusion and reactivity on water ice. explore 6-25 K range submonolayer surface coverages. derive law observe transition from to diffusion. Despite mass O, tunneling even 6 K. As consequence, solid-state astrochemistry...
Interstellar carbonaceous dust is mainly formed in the innermost regions of circumstellar envelopes around carbon-rich asymptotic giant branch (AGB) stars. In these highly chemically stratified regions, atomic and diatomic carbon, along with acetylene are most abundant species after H
The morphology of water ice in the interstellar medium is still an open question. Although accretion gaseous could not be only possible origin observed icy mantles covering dust grains cold molecular clouds, it well known that accreted from gas phase on surfaces kept at 10 K forms films exhibit a very high porosity. It also dark clouds H(2) formation occurs surface and part energy (4.48 eV) released when adsorbed atoms react to form deposited ice. experimental study described present work...
GIADA (Grain Impact Analyser and Dust Accumulator) on-board the Rosetta mission to comet 67P/Churyumov-Gerasimenko was designed study physical dynamical properties of dust particles ejected by during encounter. In this paper we report results analysis data collected past seven years cruise phase. During period detection subsystems were switched on for periodic in-flight payload checkouts monitor their state-of-health including potential changes in its performance that could affect...
The formation of the first monolayer water molecules on bare dust grains is primary importance to understand growth icy mantles that cover in interstellar medium. In this work, we explore experimentally from O2 + D reaction silicate surfaces simulates present diffuse clouds at visual extinctions (AV < 3 mag). For comparison, also study covered with amorphous ice representing dense ⩾ Our studies focus sub-monolayer and regimes using reflection absorption infrared spectroscopy...
Using the King and Wells method, we present experimental data on dependence of sticking molecular hydrogen deuterium beam temperature onto nonporous amorphous solid water ice surfaces interstellar interest. A statistical model that explains isotopic effect behavior our is proposed. This gives an understanding discrepancy between all known results hydrogen. Moreover, it able to fit theoretical Buch et al. [Astrophys. J. 379, 647 (1991)] atomic deuterium. For astrophysical applications,...
Context . Multi-year laboratory experiments have demonstrated that frozen icy mixtures containing simple organic and inorganic molecules (such as H 2 O, N , CH 4 CO, CO C 6 etc.), if exposed to a flux of energetic ions or UV photons, give rise new more complex at low temperatures (10–50 K). A fraction the synthesized is volatile while remaining refractory therefore it preserved after warm-up substrate room temperature. Moreover, part material formed during annealing temperature, when...
We report on an experimental study the formation of water, through D + O2 pathway, a sample amorphous solid i.e. realistic analogue surface interstellar grains dense clouds. For improving our conditions we use deuterium instead hydrogen. obtain, using both Temperature-Programmed Desorption Spectroscopy and Infrared Spectroscopy, that morphology nascent water ice is mostly compact. compare results with those obtained previously by Oba et al. show first technique more effective in probing ice....
We describe the results obtained on a set of organic samples that have been part experiment "Photochemistry Space Station (PSS)" EXPOSE-R2 mission conducted EXPOSE-R facility situated outside International (ISS). The were prepared in Catania laboratory by 200 keV He+ irradiation N2:CH4:CO icy mixtures deposited at 17 K, vacuum UV (VUV) transparent MgF2 windows. This material contains different chemical groups, including triple CN bonds, are thought to be interest for astrobiology. It is...
Ultraviolet (UV) processing in the insterstellar medium (ISM) induces dehydrogenation of hydrocarbons. Aliphatics, including alkanes, are present different interstellar environments, being prevalently formed evolved stars; thus, by UV photoprocessing alkanes plays an important role chemistry ISM, leading to formation unsaturated hydrocarbons and eventually aromatics, latter ubiquitously detected ISM. Here, through combined experimental results \textit{ab-initio} calculations, we show that...
Abstract Development of sustainable processes for hydrocarbons synthesis is a fundamental challenge in chemistry since these are unquestionable importance the production many essential synthetic chemicals, materials and carbon-based fuels. Current industrial rely on non-abundant metal catalysts, temperatures hundreds Celsius pressures tens bars. We propose an alternative gas phase process under mild reaction conditions using only atomic carbon, molecular hydrogen inert carrier gas....
Abstract Ultraviolet (UV) processing in the interstellar medium (ISM) induces dehydrogenation of hydrocarbons. Aliphatics, including alkanes, are present different environments, being prevalently formed evolved stars; thus, by UV photoprocessing alkanes plays an important role chemistry ISM, leading to formation unsaturated hydrocarbons and eventually aromatics, latter ubiquitously detected ISM. Here, through combined experimental results ab initio calculations, we show that absorption...