Ilias Cholis and Iason Krommydas 2023 ApJ 950 120
An enhancement in the positron fraction (the number of positrons compared to positrons plus electrons) at an energy of 12 gigaelectronvolts could be linked to the creation of the Fermi bubbles.
James D. Keegans et al 2023 ApJS 268 8
Metallicity can have an effect on the elements created in Type Ia supernovae once the mass fraction of 22Ne (a stand-in for metallicity) reaches a level of 0.001 times the solar abundance.
Jonathan R. Gair et al 2023 AJ 166 22
Even when the electromagnetic counterpart of a gravitational-wave signal can’t be identified, researchers have shown that a statistical approach can allow for an estimate of the Hubble constant.
Jounghun Lee and Jun-Sung Moon 2023 ApJL 951 L26
Observations show for the first time that the spins of galaxies adjacent to cosmic voids — large regions containing almost no galaxies — switch from perpendicular to parallel at a certain mass.
Tyler Gorda et al 2023 ApJ 950 107
Researchers have used quantum chromodynamics (QCD) to advance our understanding of the equation of state — the relationship between density, temperature, and pressure — of a neutron star’s interior.
Alex J. Meyer et al 2023 Planet. Sci. J. 4 141
The Double Asteroid Redirection Test (DART) mission was a success, and researchers are now assessing its impact; a follow-up mission in 2027 will give us a closer look at the aftermath.