New modeling provides insight into the coronae of solar-type stars that rotate far more rapidly than the Sun, yielding X-ray spectra and luminosities for these dense and ultra-hot coronae.
An analysis of the solar energetic particle proton population suggests that the temperature of this population hovers around 1 MeV while the density spans several orders of magnitude.
No radio emission was detected from a sample of old (>1 year) supernovae, despite the expectation that these supernovae exploded into dense circumstellar material.
Researchers have discovered linearly polarized scattered light from a hot Jupiter exoplanet, best explained by the presence of silicate particles with effective radii of 0.038 micron.
When galactic bars form rapidly, the galaxy’s dark matter halo spin appears to have little impact, but when the process takes longer, halo spin can hasten or delay bar formation, depending on the direction of the halo’s spin.
Long-term observations and modeling of a transient likely associated with a a star–planet merger suggest that the star was on the brink of joining the main sequence and the planet was at least several times as massive as Jupiter.