A5061782741- Astro and Planetary Science
- Planetary Science and Exploration
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Atomic and Molecular Physics
- Molecular Spectroscopy and Structure
- Isotope Analysis in Ecology
- Advanced Chemical Physics Studies
- Astronomical Observations and Instrumentation
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Space Satellite Systems and Control
- Solar and Space Plasma Dynamics
- Atmospheric chemistry and aerosols
- Ion-surface interactions and analysis
- Gamma-ray bursts and supernovae
- Geology and Paleoclimatology Research
- Ionosphere and magnetosphere dynamics
- Marine and environmental studies
- Historical and Architectural Studies
- Nuclear Physics and Applications
- Historical Astronomy and Related Studies
- Geophysics and Gravity Measurements
- Laser-induced spectroscopy and plasma
Astronomical Institute of the Slovak Academy of Sciences
2014-2024
Slovak Academy of Sciences
2014-2024
National Institute for Astrophysics
2009-2022
Astronomical Observatory of Rome
2021-2022
Osservatorio Astrofisico di Catania
2009-2017
Tatra (Czechia)
2017
Université Paris Cité
2014
Observatoire de Paris
2014
Centre National de la Recherche Scientifique
2014
Université de Versailles Saint-Quentin-en-Yvelines
2014
Sulphur appears to be depleted by an order of magnitude or more from its elemental abundance in star-forming regions. In the last few years, numerous observations and experiments have been performed understand reasons behind this depletion without providing a satisfactory explanation sulphur chemistry towards high-mass cores. Several sulphur-bearing molecules observed these regions, yet none are abundant enough make up gas-phase deficit. Where, then, does hidden reside? This paper represents...
<i>Context. <i/>Chemical models predict the presence of S-bearing molecules such as hydrogen sulfide (H<sub>2<sub/>S) in interstellar icy grain mantles dense molecular clouds. Up to now only two molecules, namely sulfur dioxide (SO<sub>2<sub/>) and carbonyl (OCS), have been detected solid phase towards young stellar objects (YSOs), while upper limits for H<sub>2<sub/>S reported same lines sight. The estimated abundance is not able account cosmic S abundance.<i>Aims. <i/>In this paper we...
ABSTRACT The recent detection of ethanolamine (EtA, HOCH$_2$CH$_2$NH$_2$), a key component phospholipids, i.e. the building blocks cell membranes, in interstellar medium is line with an exogenous origin life-relevant molecules. However, stability and survivability EtA molecules under inter/circumstellar Solar System conditions have yet to be demonstrated. Starting from assumption that mainly forms on ice grains, we systematically exposed EtA, pure mixed amorphous water (H$_2$O) ice,...
Context. Formamide (NH2HCO) and isocyanic acid (HNCO) have been observed as gaseous species in several astronomical environments such cometary comae pre- proto-stellar objects. A debate is open on the formation route of those molecules, particular if they are formed by chemical reactions gas phase and/or grains. In this latter case it relevant to understand occurs through surface or induced energetic processing.
Abstract The modelling of molecular excitation and dissociation processes relevant to astrochemistry requires the validation theories by comparison with data generated from laboratory experimentation. newly commissioned Ice Chamber for Astrophysics-Astrochemistry (ICA) allows study astrophysical ice analogues their evolution when subjected energetic processing, thus simulating alterations interstellar icy grain mantles outer Solar System bodies undergo. ICA is an ultra-high vacuum compatible...
Sulfur is an abundant element in the cosmos and it thus important contributor to astrochemistry interstellar medium Solar System. Astronomical observations of gas solid phases dense interstellar/circumstellar regions have evidenced that sulfur underabundant. The hypothesis explain such a circumstance incorporated some species phase (i.e. as frozen gases and/or refractory solids) phase, which for different reasons not been observed so far. Here we wish give contribution field by studying...
The Ice Chamber for Astrophysics-Astrochemistry (ICA) is a new laboratory end-station located at the Institute Nuclear Research (Atomki) in Debrecen, Hungary. ICA has been specifically designed study of physico-chemical properties astrophysical ice analogues and their chemical evolution when subjected to ionising radiation thermal processing. an ultra-high vacuum compatible chamber containing series IR-transparent substrates mounted copper holder connected closed-cycle cryostat capable being...
Aims. The structure of the complex meteoroid particles released from comet 96P/Machholz is studied to reveal a relationship among meteor showers observed in Earth's atmosphere that belong this complex.
Laboratory experiments have shown that the energetic processing, i.e. ion bombardment and UV photolysis, of interstellar grain mantles cometary surfaces is efficient in production formamide. To explain its presence gas-phase these astrophysical environments, a desorption mechanism has to be taken into account. In this work we show experimental results on thermal evolution formamide when deposited at 17 K as pure mixture with water or carbon monoxide. samples, observed 220 K. Moreover,...
The astrochemistry of CO2 ice analogues has been a topic intensive investigation due to the prevalence throughout interstellar medium and Solar System, as well possibility it acting carbon feedstock for synthesis larger, more complex organic molecules. In order accurately discern physico-chemical processes in which plays role, is necessary have laboratory-generated spectra compare against observational data acquired by ground- space-based telescopes. A key factor known influence appearance...
Water (H2O) ice is ubiquitous component of the universe, having been detected in a variety interstellar and Solar System environments where radiation plays an important role its physico-chemical transformations. Although chemistry H2O astrophysical analogues has well studied, direct systematic comparisons different solid phases are scarce typically limited to just two phases. In this article, we describe results in-depth study 2 keV electron irradiation amorphous water (ASW), restrained...
Laboratory studies of the radiation chemistry occurring in astrophysical ices have demonstrated dependence this on a number experimental parameters. One parameter which has received significantly less attention is that phase solid ice under investigation. In present study, we performed systematic 2 keV electron irradiations amorphous and crystalline phases pure CH3OH N2O analogues. Radiation-induced decay these concomitant formation products were monitored situ using FT-IR spectroscopy. A...
The organic chemistry occurring in interstellar environments may lead to the production of complex molecules that are relevant emergence life. Therefore, order understand origins life itself, it is necessary probe carbon-bearing under conditions simulate space. Several these regions, such as dense molecular cores, exposed ionizing radiation form galactic cosmic rays, which act an important driver destruction and synthesis. In this paper, we report results a comparative systematic study...
Carbonic acid (H2CO3) is a weak relevant to astrobiology which, date, remains undetected in space. Experimental work has shown that the beta-polymorph of H2CO3 forms under space conditions through energetic (UV photon, electron, and cosmic ray) processing CO2- H2O-rich ices. We present systematic set VUV photoabsorption spectra pure mixed CO2 H2O ices exposed 1 keV electrons at 20 80 K simulate different interstellar Solar System environments. Ices were then annealed obtain layer which was...
Aims.We attempt to prove or disprove the comet 96P/Machholz and asteroid 2003 EH1 as parents of Quadrantids. These two bodies have been regarded most probable candidates. Moreover, we investigate a possibility an existence their common progenitor, in past.
<i>Context. <i/>The surfaces of airless bodies in the Solar System are continuously altered by bombardment micrometeoroids and irradiation solar wind, flares, cosmic particles. Major effects this process – space weathering darkening "reddening" spectra surface materials, as well a "degrading" absorption features.<i>Aims. <i/>We studied changes induced energetic ion ultraviolet-visual-near-infrared (UV-Vis-NIR) (0.2–0.98 <i>μ<i/>m) reflectance targets selected to mimic inner System. Our...
Context: The dwarf planet (1) Ceres - next target of the NASA Dawn mission is largest body in asteroid main belt; although several observations this have been performed so far, presence surface water ice still questioned. Aims: Our goal to better understand composition Ceres, and constrain exposed ice. Methods: We acquired new visible near-infrared spectra at Telescopio Nazionale Galileo (TNG, La Palma, Spain), reanalyzed literature 3-$\mu$m region. Results: obtained first...
The use of mid-infrared spectroscopy to characterise the chemistry icy interstellar and Solar System environments will be exploited in near future better understand chemical processes molecular inventories various astronomical environments. This is, part, due observational work made possible by recently launched James Webb Space Telescope as well forthcoming missions outer that observe spectroscopic region (e.g., Jupiter Icy Moons Explorer Europa Clipper missions). However, such...
Context. Infrared observations show the presence of icy mantles along line sight toward young stellar objects (YSOs), where a temperature gradient is expected and indirectly observed. In this environment, are affected by ion UV irradiation. Laboratory experiments that molecules formed after irradiation mixtures. However, most done so far have been performed in temperatures range 10–20 K.
Context. The Brazilian Aster project plans a space mission to rendezvous and characterize (153591) 2001 SN263, one of the only two known triple near-Earth asteroids (NEAs). Improving knowledge its physical properties is necessary optimize planning science return.