DARTOIS, E.; NOBLE, Jennifer; CASELLI, P.; FRASER, H.; JIMÉNEZ-SERRA, I.; MATÉ, B.; MCCLURE, M.; MELNICK, G.; PENDLETON, Y.; SHIMONISHI, T.; SMITH, Z.; STURM, J.; TAILLARD, A.; WAKELAM, V.; BOOGERT, A.; DROZDOVSKAYA, M.; ERKAL, J.; HARSONO, D.; HERRERO, V.; IOPPOLO, S.; LINNARTZ, H.; MCGUIRE, B.; PEROTTI, G.; QASIM, D.; ROCHA, W.

doi:10.1038/s41550-023-02155-x

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DARTOIS, E.
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]

CASELLI, P.
Dipartimento di Chimica "Giacomo Ciamician"

Langue

Article de revue

Ce document a été publié dans

Nature Astronomy. 2024-01-09, vol. 8, n° 3, p. 359-367

Nature Publishing Group

Résumé en anglais

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.< Réduire

Mots clés en anglais

Astrophysical dust

Interstellar medium

Laboratory astrophysics

URI

https://oskar-bordeaux.fr/handle/20.500.12278/203480

DOI

http://dx.doi.org/10.1038/s41550-023-02155-x

Projet Européen

Linking chemistry and physics in the planet-forming zones of disks

Origine

Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804