Spectroscopic sizing of interstellar icy grains with JWST
DARTOIS, E.
Centre National de la Recherche Scientifique [CNRS]
Université Paris-Saclay
Institut des Sciences Moléculaires d'Orsay [ISMO]
Centre National de la Recherche Scientifique [CNRS]
Université Paris-Saclay
Institut des Sciences Moléculaires d'Orsay [ISMO]
NOBLE, Jennifer
Physique des interactions ioniques et moléculaires [PIIM]
Centre National de la Recherche Scientifique [CNRS]
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Physique des interactions ioniques et moléculaires [PIIM]
Centre National de la Recherche Scientifique [CNRS]
DARTOIS, E.
Centre National de la Recherche Scientifique [CNRS]
Université Paris-Saclay
Institut des Sciences Moléculaires d'Orsay [ISMO]
Centre National de la Recherche Scientifique [CNRS]
Université Paris-Saclay
Institut des Sciences Moléculaires d'Orsay [ISMO]
NOBLE, Jennifer
Physique des interactions ioniques et moléculaires [PIIM]
Centre National de la Recherche Scientifique [CNRS]
Physique des interactions ioniques et moléculaires [PIIM]
Centre National de la Recherche Scientifique [CNRS]
MCGUIRE, B.
Department of Chemistry [MIT Cambridge]
National Radio Astronomy Observatory [Charlottesville] [NRAO]
< Reduce
Department of Chemistry [MIT Cambridge]
National Radio Astronomy Observatory [Charlottesville] [NRAO]
Language
en
Article de revue
This item was published in
Nature Astronomy. 2024-01-09, vol. 8, n° 3, p. 359-367
Nature Publishing Group
English Abstract
Clouds of gas and dust in the Galaxy are nurseries in which stars and planetary systems are born. Cold dust grains grow icy mantles -by accretion, surface chemistry, and collision mechanisms -during their journey from the ...Read more >
Clouds of gas and dust in the Galaxy are nurseries in which stars and planetary systems are born. Cold dust grains grow icy mantles -by accretion, surface chemistry, and collision mechanisms -during their journey from the diffuse interstellar medium to protoplanetary disks. Our "Ice Age" JWST observations of the dense Chamaeleon I cloud reveal that this growth starts early, before the protostellar phase, significantly modifying the ice absorption band spectroscopic profiles. Spectral analysis confirms that the grains reach micron sizes, implying myriad changes in local microphysics, including mass transfer from small to large grains, reduction in the grain surface available for chemistry, and modification of the penetration and propagation of radiation fields. Deformation of the observed profiles complicates chemical abundance determination. Observing extensive icy growth in dense clouds quantitatively constrains the grain size evolution prior to star-and planet-formation.Read less <
English Keywords
Astrophysical dust
Interstellar medium
Laboratory astrophysics
European Project
Linking chemistry and physics in the planet-forming zones of disks
Origin
Hal imported