First pixel-by-pixel JWST absorption maps of multiple ice species toward six Class 0 protostars reveal abundance variations from heating and outflows, with total composition matching prestellar formation models covering ~90% of inventory.
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JWST observations find constant ~1% PAH abundance in the M82 superwind to 5 kpc, consistent with shielding in surface layers of cool clouds and possible replenishment.
Experiments identify acenaphthene derivatives from C11H9+ reactivity with methylated naphthalenes and link them to efficient formation of acenaphthylene-like species in cold clouds.
Aliphatic side chains on PAHs shift certain infrared band intensity ratios, especially in small molecules, which can mislead ionization-state estimates, though the main diagnostic grid still applies with possible calibration.
The document records key conclusions, challenges, and open questions from discussion sessions at a 2025 conference focused on interstellar, circumstellar, and galactic dust with emphasis on JWST and ALMA results.
citing papers explorer
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Mapping Interstellar Ice Inventory toward Class 0 Protostars in Star-forming Region Orion A with JWST Data
First pixel-by-pixel JWST absorption maps of multiple ice species toward six Class 0 protostars reveal abundance variations from heating and outflows, with total composition matching prestellar formation models covering ~90% of inventory.
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JWST Observations of Starbursts: Dust Processing in the M82 Superwind
JWST observations find constant ~1% PAH abundance in the M82 superwind to 5 kpc, consistent with shielding in surface layers of cool clouds and possible replenishment.
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Acenaphthene Derivatives as Signatures of C$_{11}$H$_9^+$ Reactivity with Methylated Naphthalenes
Experiments identify acenaphthene derivatives from C11H9+ reactivity with methylated naphthalenes and link them to efficient formation of acenaphthylene-like species in cold clouds.
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The Influence of Aliphatic Components on the Aromatic Emission Characteristics of Polycyclic Aromatic Hydrocarbons
Aliphatic side chains on PAHs shift certain infrared band intensity ratios, especially in small molecules, which can mislead ionization-state estimates, though the main diagnostic grid still applies with possible calibration.
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Summary of Discussion Sessions from "The Dusty Universe 2025: The Fifth Pandust Conference"
The document records key conclusions, challenges, and open questions from discussion sessions at a 2025 conference focused on interstellar, circumstellar, and galactic dust with emphasis on JWST and ALMA results.