Chemical evolution
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Possible heterogeneous chemistry of hydroxymethanesulfonate (HMS) in northern China winter haze Open
The chemical mechanisms responsible for rapid sulfate production, an important driver of winter haze formation in northern China, remain unclear. Here, we propose a potentially important heterogeneous hydroxymethanesulfonate (HMS) chemical…
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The Narrow Road to the Deep Past: In Search of the Chemistry of the Origin of Life Open
The sequence of events that gave rise to the first life on our planet took place in the Earth's deep past, seemingly forever beyond our reach. Perhaps for that very reason the idea of reconstructing our ancient story is tantalizing, almost…
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Membraneless polyester microdroplets as primordial compartments at the origins of life Open
Significance The prebiotic milieu was likely heterogeneous, consisting of a large number of chemicals and their associated reactions, including those not only of biological compounds, but also nonbiological compounds. Although origins of l…
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SILCC-Zoom: the dynamic and chemical evolution of molecular clouds Open
We present 3D ‘zoom-in’ simulations of the formation of two molecular clouds out of the galactic interstellar medium. We model the clouds – identified from the SILCC simulations – with a resolution of up to 0.06 pc using adaptive mesh refi…
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Chemical evolution with rotating massive star yields II. A new assessment of the solar s- and r- process components Open
The decomposition of the Solar system abundances of heavy isotopes into their s- and r- components plays a key role in our understanding of the corresponding nuclear processes and the physics and evolution of their astrophysical sites. We …
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Planet-forming material in a protoplanetary disc: the interplay between chemical evolution and pebble drift Open
The composition of gas and solids in protoplanetary discs sets the composition of planets that form out of them. Recent chemical models have shown that the composition of gas and dust in discs evolves on Myr time-scales, with volatile spec…
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The AMBRE project: chemical evolution models for the Milky Way thick and thin discs Open
We study the chemical evolution of the thick and thin discs of the Galaxy by comparing detailed chemical evolution models with recent data from the Archéologie avec Matisse Basée sur les aRchives de l'ESO project. The data suggest that the…
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The temporal evolution of neutron-capture elements in the Galactic discs Open
Important insights into the formation and evolution of the Galactic disc(s) are contained in the chemical compositions of stars. We analysed high-resolution and high signal-to-noise HARPS spectra of 79 solar twin stars in order to obtain p…
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The Impact of Modeling Assumptions in Galactic Chemical Evolution Models Open
We use the OMEGA galactic chemical evolution code to investigate how the assumptions used for the treatment of galactic inflows and outflows impact numerical predictions. The goal is to determine how our capacity to reproduce the chemical …
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Nucleosynthetic history of elements in the Galactic disk Open
Context. The chemical composition of stars is intimately linked to the formation and evolution of the Galaxy. Aims. We aim to trace the chemical evolution of the Galactic disk through the inspection of the [X/Fe]-age relations of 24 specie…
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Chemical element transport in stellar evolution models Open
Stellar evolution computations provide the foundation of several methods applied to study the evolutionary properties of stars and stellar populations, both Galactic and extragalactic. The accuracy of the results obtained with these techni…
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Coenzymes and Their Role in the Evolution of Life Open
The evolution of coenzymes, or their impact on the origin of life, is fundamental for understanding our own existence. Having established reasonable hypotheses about the emergence of prebiotic chemical building blocks, which were probably …
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Carbon and oxygen in H ii regions of the Magellanic Clouds: abundance discrepancy and chemical evolution Open
We present C and O abundances in the Magellanic Clouds derived from deep spectra of HII regions. The data have been taken with the Ultraviolet-Visual Echelle Spectrograph at the 8.2-m VLT. The sample comprises 5 HII regions in the Large Ma…
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The chemical compositions of accreted and <i>in situ</i> galactic globular clusters according to SDSS/APOGEE Open
Studies of the kinematics and chemical compositions of Galactic globular clusters (GCs) enable the reconstruction of the history of star formation, chemical evolution, and mass assembly of the Galaxy. Using the latest data release (DR16) o…
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Investigating Prebiotic Protocells for a Comprehensive Understanding of the Origins of Life: A Prebiotic Systems Chemistry Perspective Open
Protocells are supramolecular systems commonly used for numerous applications, such as the formation of self-evolvable systems, in systems chemistry and synthetic biology. Certain types of protocells imitate plausible prebiotic compartment…
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Towards open-ended evolution in self-replicating molecular systems Open
In this review we discuss systems of self-replicating molecules in the context of the origin of life and the synthesis of de novo life. One of the important aspects of life is the ability to reproduce and evolve continuously. In this revie…
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Chemical equilibrium in AGB atmospheres: Successes, failures, and prospects for small molecules, clusters, and condensates. Open
Chemical equilibrium has proven extremely useful for predicting the chemical composition of AGB atmospheres. Here we use a recently developed code and an updated thermochemical database that includes gaseous and condensed species involving…
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The<i>Gaia</i>-ESO Survey: Sodium and aluminium abundances in giants and dwarfs Open
Context. Stellar evolution models predict that internal mixing should cause some sodium overabundance at the surface of red giants more massive than ~1.5-2.0 M⊙. The surface aluminium abundance should not be affected. Nevertheless, observa…
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Stellar migrations and metal flows – Chemical evolution of the thin disc of a simulated Milky Way analogous galaxy Open
In order to understand the roles of metal flows in galaxy formation and evolution, we analyse our self-consistent cosmological chemodynamical simulation of a Milky Way like galaxy during its thin-disc phase. Our simulated galaxy disc quali…
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Can Life Begin on Enceladus? A Perspective from Hydrothermal Chemistry Open
Enceladus is a target of future missions designed to search for existing life or its precursors. Recent flybys of Enceladus by the Cassini probe have confirmed the existence of a long-lived global ocean laced with organic compounds and bio…
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New analytical solutions for chemical evolution models: characterizing the population of star-forming and passive galaxies Open
Analytical models of chemical evolution, including inflow and outflow of gas,\nare important tools to study how the metal content in galaxies evolves as a\nfunction of time. In this work, we present new analytical solutions for the\nevolut…
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Galactic archaeology with asteroseismic ages Open
Context. With the wealth of information from large surveys and observational campaigns in the contemporary era, it is critical to properly exploit the data to constrain the parameters of Galactic chemical evolution models and quantify the …
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Evolution Through the Post-starburst Phase: Using Post-starburst Galaxies as Laboratories for Understanding the Processes that Drive Galaxy Evolution Open
Post-starburst (or "E+A") galaxies trace the fastest and most dramatic\nprocesses in galaxy evolution. Recent work studying the evolution of galaxies\nthrough this phase have revealed insights on how galaxies undergo structural\nand stella…
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Probing the Chemical Complexity of Amines in the ISM: Detection of Vinylamine (C<sub>2</sub>H<sub>3</sub>NH<sub>2</sub>) and Tentative Detection of Ethylamine (C<sub>2</sub>H<sub>5</sub>NH<sub>2</sub>) Open
Amines, particularly primary amines (R-NH 2 ), are closely related to the primordial synthesis of amino acids since they share the same structural backbone. However, only a limited number of amines has been identified in the interstellar m…
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The evolution of chemical abundance in quasar broad line region Open
We study the relation between the metallicity of quasar broad line region\n(BLR) and black hole (BH) mass ($10^{7.5}M_{\\odot} \\sim 10^{10}M_{\\odot}$) and\nquasar bolometric luminosity ($10^{44.6}erg/s \\sim 10^{48} erg/s$) using a\nsamp…
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Autocatalytic Networks at the Basis of Life’s Origin and Organization Open
Life is more than the sum of its constituent molecules. Living systems depend on a particular chemical organization, i.e., the ways in which their constituent molecules interact and cooperate with each other through catalyzed chemical reac…
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GALACTIC CHEMICAL EVOLUTION: THE IMPACT OF THE <sup>13</sup>C-POCKET STRUCTURE ON THE s-PROCESS DISTRIBUTION Open
The solar s -process abundances have been analyzed in the framework of a Galactic Chemical Evolution (GCE) model. The aim of this work is to implement the study by Bisterzo et al., who investigated the effect of one of the major uncertaint…
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Previously unknown class of metalorganic compounds revealed in meteorites Open
Significance In this study we report the discovery of a previously unrecognized chemical class, dihydroxymagnesium carboxylates, [(HO) 2 MgO 2 CR] − , gained from nonterrestrial meteoritic analyses. The existence of such low-coordination o…
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Emergence of homochirality in large molecular systems Open
Significance The selection of a single molecular handedness among the two possible configurations of a given molecule, or homochirality, is observed across all living matter and is a mystery in the origin of life. Here, we show that large …
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The Gaia-ESO Survey: evidence of atomic diffusion in M67? Open
Investigating the chemical homogeneity of stars born from the same molecular cloud at virtually the same time is very important for our understanding of the chemical enrichment of the interstellar medium and with it the chemical evolution …