A5089065980- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Mass Spectrometry Techniques and Applications
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Atmospheric chemistry and aerosols
- Spectroscopy and Quantum Chemical Studies
- Quantum, superfluid, helium dynamics
- Astrophysical Phenomena and Observations
- Inorganic Fluorides and Related Compounds
- Origins and Evolution of Life
- Phase Equilibria and Thermodynamics
- Planetary Science and Exploration
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Photochemistry and Electron Transfer Studies
- Catalytic Processes in Materials Science
Laboratoire d’Astrophysique de Marseille
2019-2024
Château Gombert
2023-2024
Aix-Marseille Université
2014-2023
Centre National de la Recherche Scientifique
2014-2023
Centre National d'Études Spatiales
2020
Physique des interactions ioniques et moléculaires
2009-2018
Délégation Provence et Corse
2014
École Polytechnique Fédérale de Lausanne
2001-2009
Center for Astrophysics Harvard & Smithsonian
2005-2007
Harvard University
2005-2007
Abstract Modern and future surveys effectively provide a panchromatic view for large numbers of extragalactic objects. Consistently modeling these multiwavelength survey data is critical but challenging task studies. The Code Investigating GALaxy Emission ( cigale ) an efficient python code spectral energy distribution (SED) fitting galaxies active galactic nuclei (AGNs). Recently, major extension (named x-cigale has been developed to account AGN/galaxy X-ray emission improve AGN at UV-to-IR...
Complex organic molecules have been observed for decades in the interstellar medium. Some of them might be considered as small bricks macromolecules at base terrestrial life. It is hence particularly important to understand chemistry Solar-like star forming regions. In this article, we present a new observational project: SOLIS (Seeds Of Life Space). This Large Project IRAM-NOEMA interferometer, and its scope image emission several crucial sample regions different evolutionary stage...
We present the results of a 7 mm spectral survey molecular absorption lines originating in disk z=0.89 spiral galaxy located front quasar PKS 1830-211. [...] A total 28 different species, plus 8 isotopic variants, were detected toward south-west region, about 2 kpc from center galaxy, which therefore has largest number species any extragalactic object so far. The our rotation diagram analysis show that temperatures are close to cosmic microwave background temperature 5.14 K we expect measure...
Context. Hydrogenation reactions dominate grain surface chemistry in dense molecular clouds and lead to the formation of complex saturated molecules interstellar medium.
Context. Modern versions of the Miller-Urey experiment claim that formamide (NH2CHO) could be starting point for formation metabolic and genetic macromolecules. Intriguingly, is indeed observed in regions forming solar-type stars external galaxies.
Context. Much of the formaldehyde (H2CO) is formed from hydrogenation CO on interstellar dust grains, and released in gas phase hot core regions. Radio-astronomical observations these regions are directly related to its desorption grains.
Context. Studing chemical reactivity in astrophysical environments is an important means for improving our understanding of the origin organic matter molecular clouds, protoplanetary disks, and possibly, as a final destination, solar system. Laboratory simulations ice analogs provide insight into these environments. Here, we use experimental to investigate Strecker synthesis leading formation aminoacetonitrile astrophysical-like conditions. The interesting compound because it was detected...
Context. Water is the major component of interstellar ice mantle. In ice, chemical reactivity limited by diffusion reacting molecules, which are usually present at abundances a few percent with respect to water.
Context. It is generally agreed that hydrogenation reactions dominate chemistry on grain surfaces in cold, dense molecular cores, saturating the molecules present ice mantles. Aims. We a study of low temperature reactivity solid phase isocyanic acid (HNCO) with hydrogen atoms, aim elucidating its reaction network. Methods. Fourier transform infrared spectroscopy and mass spectrometry were employed to follow evolution pure HNCO during bombardment H atoms. Both multilayer monolayer regimes...
Among all existing complex organic molecules, glycolaldehyde HOCH2CHO and ethylene glycol HOCH2CH2OH are two of the largest detected molecules in interstellar medium. We investigate both experimentally theoretically low-temperature reaction pathways leading to grains. Using infrared spectroscopy, mass spectroscopy quantum calculations, we formation based on HCO• •CH2OH radical–radical recombinations. also show that is main intermediate radical species H2CO CH3OH hydrogenation processes. then...
The interstellar delivery of carbon atoms locked into molecules might be one the key ingredients for emergence life. Cyanopolyynes are chains delimited at their two extremities by an atom hydrogen and a cyano group, so that they excellent reservoirs carbon. simplest member, HC3N, is ubiquitous in galactic medium found also external galaxies. Thus, understanding growth cyanopolyynes regions forming stars similar to our Sun, what affects it, particularly relevant. In framework IRAM/NOEMA Large...
Ammonium salts on comet 67P The distribution of carbon and nitrogen in the Solar System is thought to reflect stability carbon- nitrogen-bearing molecules when exposed heat forming Sun. Comets have a low nitrogen-to-carbon ratio, which contrary expectations because they originate outer where species should be common. Poch et al. used laboratory experiments simulate cometary surfaces compared resulting spectra with 67P/Churyumov-Gerasimenko. They assigned previously unidentified infrared...
We study low temperature reactivity of methylamine (CH3NH2) and carbon dioxide (CO2) mixed within different ratios, using FTIR spectroscopy mass spectrometry. report experimental evidence that the methylammonium methylcarbamate [CH3NH3(+)][C3NHCO2(-)] methylcarbamic acid (CH3NHCOOH) are formed when initial mixture CH3NH2:CO2 is warmed up to temperatures above 40 K. An excess CH3NH2 favors carbamate formation while an CO2 leads a both acid. Quantum calculations show molecules associated into...
Context. We study carbamic acid [ NH2COOH] and ammonium carbamate NH2COO-] NH4+] formation in interstellar ice analogs.
Aminomethanol (NH2CH2OH) is formed at low temperature from the purely thermal reaction of NH3 and H2CO in laboratory interstellar ice analogs. We report for first time its infrared mass spectra. study desorption kinetics using Fourier transform spectroscopy spectrometry. Its rate estimated to be k(T) = 0.05 × exp(−4.5(kJ mol-1)/RT) energy Edes 58 ± 2 kJ mol−1. NH2CH2OH can also contribute 5–8 μm region thermally processed ices encountered many young stellar objects. Gas phase may present hot...
<i>Context. <i/>Analyses of dust cometary grains collected by the Stardust spacecraft have shown presence amines and amino acids molecules, among them glycine (NH<sub>2<sub/>CH<sub>2<sub/>COOH). We show how molecule could be produced in protostellar environments before its introduction into comets.<i>Aims. <i/>We study evolution interstellar ice analogues affected both thermal heating vacuum ultraviolet (VUV) photons, addition to nature formed molecules confrontation our experimental results...
Aims. We investigate the purely thermal formation of hexamethylenetetramine (HMT, C6H12N4) in interstellar ice analogs from non-photolysed and compare our results with those for photolysed ice.
This contribution is focused on the concurrent pathway to Strecker synthesis of amino acids in an astrophysical-like environment. We indeed use experimental and modeling simulations investigate possibility form aminomethanol (HOCH2NH2) concurrence with hydroxyacetonitrile (HOCH2CN) from ices containing at 40 K formaldehyde (CH2O), ammonia (NH3), cyanide ion (CN−). demonstrate using infrared spectroscopy mass spectrometry that formation (Ea = 4.5 kJ mol−1) competing 3.9 mol−1). The ratio...
HCN is a molecule central to interstellar chemistry, since it the simplest containing carbon-nitrogen bond and its solid state chemistry rich. The aim of this work was study NH3 + -> NH4+CN- thermal reaction in ice analogues. Laboratory experiments based on Fourier transform infrared spectroscopy mass spectrometry were performed characterise product formation kinetics. This purely can occur at low temperatures ices without requiring non-thermal processing by photons, electrons or cosmic...
The diffusion of molecules in interstellar ice is a fundamental phenomenon to take into account while studying the formation complex this ice. This work presents theoretical study on H2O, NH3, CO2, CO, and H2CO bulk low density amorphous (LDA) ice, taking physical conditions prevailing space, i.e. temperatures below 150 K extremely pressure. was undertaken by means molecular dynamics simulations. For CO2 for which no experimental data were available we conducted our own experiments. From...
We report new interferometric images of cyclopropenylidene, c-C$_3$H$_2$, towards the young protocluster OMC-2 FIR\,4. The observations were performed at 82 and 85 GHz with NOrthern Extended Millimeter Array (NOEMA) as part project Seeds Of Life In Space (SOLIS). addition, IRAM-30m data used to investigate physical structure find that c-C$_3$H$_2$ gas emits from same region where previous SOLIS showed bright HC$_5$N emission. From a non-LTE analysis data, has an average temperature...
The chemical enrichment in the interstellar medium (ISM) of galaxies is regulated by several physical processes: stellar evolution, grain formation and destruction, galactic inflows outflows. Understanding such processes essential to follow through cosmic epochs, interpret observations. Despite importance topics, efficiency different driving evolution baryons galaxies, remain controversial. We revise current description metal dust local low-metallicity dwarf we develop a for Lyman Break...