Giant-planet hosts preferentially formed in the metal-rich inner Galaxy and later migrated, while rocky-only systems are less centrally concentrated and show smaller radial excursions.
A far-ultraviolet-driven photoevaporation flow observed in a protoplanetary disk
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abstract
Most low-mass stars form in stellar clusters that also contain massive stars, which are sources of far-ultraviolet (FUV) radiation. Theoretical models predict that this FUV radiation produces photo-dissociation regions (PDRs) on the surfaces of protoplanetary disks around low-mass stars, impacting planet formation within the disks. We report JWST and Atacama Large Millimetere Array observations of a FUV-irradiated protoplanetary disk in the Orion Nebula. Emission lines are detected from the PDR; modelling their kinematics and excitation allows us to constrain the physical conditions within the gas. We quantify the mass-loss rate induced by the FUV irradiation, finding it is sufficient to remove gas from the disk in less than a million years. This is rapid enough to affect giant planet formation in the disk.
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Probing the origins. III. Exoplanet demographics across Galactic birth radii
Giant-planet hosts preferentially formed in the metal-rich inner Galaxy and later migrated, while rocky-only systems are less centrally concentrated and show smaller radial excursions.