Agnibha De Sarkar et al 2023 ApJ 951 62
RS Ophiuchi undergoes nova outbursts every 15–20 years, and new data in the very-high-energy gamma-ray regime have enabled researchers to test a new model for the origin of its high-energy emission.
Alex R. Howe et al 2023 ApJL 951 L25
If the model-confounding T-type brown dwarf GJ 229B is actually two brown dwarfs, that could provide a better fit to model parameters including temperature, mass, and radius.
Shuo Xiao et al 2023 ApJS 268 5
X-ray bursts most commonly last about 2 milliseconds, which corresponds to an origin region of about 600 kilometers; this supports the hypothesis that X-ray bursts arise from the magnetospheres of magnetars.
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.