Search Publications
Strong damped Lyman-α absorption in young star-forming galaxies at redshifts 9 to 11
Finkelstein, Steven L.; Arrabal Haro, Pablo; Heintz, Kasper E. +18 more
Primordial neutral atomic gas, mostly composed of hydrogen, is the raw material for star formation in galaxies. However, there are few direct constraints on the amount of neutral atomic hydrogen (H I) in galaxies at early cosmic times. We analyzed James Webb Space Telescope (JWST) near-infrared spectroscopy of distant galaxies, at redshifts ≳8. Fr…
A far-ultraviolet–driven photoevaporation flow observed in a protoplanetary disk
Hartigan, Patrick; Zhang, Yong; Gordon, Karl D. +144 more
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 photodissociation regions (PDRs) on the surfaces of protoplanetary disks around low-mass stars, which affects planet formation within the disks. We report Ja…
Abundant hydrocarbons in the disk around a very-low-mass star
Waters, L. B. F. M.; Olofsson, G.; Kamp, I. +40 more
Very-low-mass stars (those less than 0.3 solar masses) host orbiting terrestrial planets more frequently than other types of stars. The compositions of those planets are largely unknown but are expected to relate to the protoplanetary disk in which they form. We used James Webb Space Telescope mid-infrared spectroscopy to investigate the chemical …
Emission lines due to ionizing radiation from a compact object in the remnant of Supernova 1987A
Fox, O. D.; Blommaert, J. A. D. L.; Larsson, J. +31 more
The nearby Supernova 1987A was accompanied by a burst of neutrino emission, which indicates that a compact object (a neutron star or black hole) was formed in the explosion. There has been no direct observation of this compact object. In this work, we observe the supernova remnant with JWST spectroscopy, finding narrow infrared emission lines of a…