Sub-Neptune GJ 1214b total envelope mass fraction has been constrained to be at least 8.1% to match observations, but the composition could be various combinations of rock, ice, and volatiles.
Inverse-Compton emission from radio lobes might be responsible for the X-ray emission seen in three active galactic nuclei classified as compact symmetric objects.
Hubble Space Telescope observations reveal a three-zone disk, polar dust lanes that might point to a past minor merger, and dust pillars that may indicate large-scale feedback.
Steven L. Finkelstein et al 2024 ApJL 969 L2
Eighty-eight candidate high-redshift galaxies — 13 of which have now been spectroscopically confirmed — show that the number density of these UV-bright galaxies didn’t change much from z ~ 14 to z ~ 9.
Transient surveys are discovering increasingly complex supernovae; one such example transitioned from being Type IIb–like to resembling a stripped-envelope supernova during a dramatic second peak.
Tyrone N. O’Doherty et al 2024 AJ 168 44
New research suggests that astronomers should proceed carefully with identifying black holes via ellipsoidal variations; a closer look at a black hole candidate revealed a likely contact binary instead.