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A magnified compact galaxy at redshift 9.51 with strong nebular emission lines
Koekemoer, Anton M.; Treu, Tommaso; Broadhurst, Tom +21 more
Ultraviolet light from early galaxies is thought to have ionized gas in the intergalactic medium. However, there are few observational constraints on this epoch because of the faintness of those galaxies and the redshift of their optical light into the infrared. We report the observation, in JWST imaging, of a distant galaxy that is magnified by g…
Direct imaging and astrometric detection of a gas giant planet orbiting an accelerating star
Burrows, Adam; Currie, Thayne; Kwon, Jungmi +31 more
Direct imaging of gas giant exoplanets provides information on their atmospheres and the architectures of planetary systems. However, few planets have been detected in blind surveys with direct imaging. Using astrometry from the Gaia and Hipparcos spacecraft, we identified dynamical evidence for a gas giant planet around the nearby star HIP 99770.…
An observed population of intermediate-mass helium stars that have been stripped in binaries
Smith, N.; de Mink, S. E.; Drout, M. R. +4 more
The hydrogen-rich outer layers of massive stars can be removed by interactions with a binary companion. Theoretical models predict that this stripping produces a population of hot helium stars of ~2 to 8 solar masses (M☉), however, only one such system has been identified thus far. We used ultraviolet photometry to identify potential st…
Element abundance patterns in stars indicate fission of nuclei heavier than uranium
Beers, Timothy C.; Placco, Vinicius M.; Holmbeck, Erika M. +9 more
The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elements heavier than uranium (transuranic nuclei) is poorly understood and inaccessible to experiments so must be extrapolated by using nucleosynthesis models. We examined el…
Evidence for a radiation belt around a brown dwarf
Pérez-Torres, M.; Guirado, J. C.; Marcaide, J. M. +2 more
Ultracool dwarfs (UCDs) are a category of astronomical objects that includes brown dwarfs and very-low-mass stars. Radio observations of UCDs have measured their brightness as a function of time (light curves) and spectral energy distributions, providing insight into their magnetic fields. We present spatially resolved radio observations of the br…