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Kepler-107 b and c have the same radius but, contrary to expectations, the outermost Kepler-107 c is much denser. This difference cannot be explained by photoevaporation by stellar high-energy particle flux and it suggests that Kepler-107 c experienced a giant impact event.
Using a pair of modest telescopes, Arimatsu et al. have observed an occultation event that purports to have been caused by a kilometre-sized Kuiper belt object (KBO). KBOs of this order of magnitude in size have not been detected before, but are likely to represent the most populous size of object in the Kuiper belt.
The distance of outflowing gas from the galaxy centre for 915 quasars is found to be typically tens of parsecs. Typical outflow mass rates and energies indicate that these outflows are energetic enough to influence the evolution of their host galaxies.
The concordance cosmology model is poorly tested at high redshifts. Here the expansion rate of the Universe in the range 0.5 < z < 5.1 is measured based on a Hubble diagram of quasars, whose distances are estimated from their X-ray and ultraviolet emission.
A spatially ubiquitous energy flux from the interior of the Sun reaches the corona through Alfvénic waves generated by internal acoustic modes. Such flux persists for the whole solar cycle and contributes significantly to the energy in the corona.
Using SN 1987A as a cosmic laboratory, Miceli et al. have measured the shock acceleration of ions heavier than oxygen, finding that the post-shock temperature of a wide range of ions is mass dependent.
Increased UV–optical nuclear emission in a nearby galaxy together with a spectrum showing emission lines typical of unobscured AGNs and Bowen fluorescence features suggests a longer-term event of intensified accretion onto the central supermassive black hole.
Precise polarization measurements from the gamma-ray burst polarimeter POLAR suggest that the gamma-ray emission is at most polarized at a level lower than predicted by some models and also shows intrapulse evolution of its polarization angle.
ALMA observations of well-studied quadruple stellar system HD 98800 have revealed the presence of a circumbinary disk in a polar orientation around one of the binary pairs, providing observational confirmation of the theoretical stability of such an arrangement.
