J. Kóta and J. R. Jokipii 2017 ApJ 839 126

A new model suggests Voyager 1’s observations of the galactic cosmic-ray flux beyond the heliopause could indicate the presence of a gradual shock followed by a slow decrease of magnetic field strength.

Zhe Xu et al 2017 ApJL 840 L21

Observations of a M7.9 solar flare reveal significant change in sunspot structure on the solar surface in response to the flare — likely due to the restructuring of coronal magnetic fields.

Chen Wang et al 2017 ApJS 230 5

Filaments and other structures have been discovered in the process of mapping the molecular gas over a 9° × 6.5° area toward the GEM OB1 association in the galactic anti-center direction.

Jeffrey Fung and Eugene Chiang 2017 ApJ 839 100

Simulations show that over time, sufficiently compact systems of super-Earths can clear their natal protoplanetary disk gas either inward to feed their star or outward to be blown away from the system.

Johan Samsing and Enrico Ramirez-Ruiz 2017 ApJL 840 L14

N-body simulations show that binary black hole (BBH) mergers that result from binary-single interactions are likely to dominate the population of high-eccentricity BBH mergers detectable by LIGO.

William E. Harris and Courtney J. Mulholland 2017 ApJ 839 102

HST photometry has revealed a population of intragalactic globular clusters (GCs) extending out to at least 500 kpc from the center of the Perseus Cluster; there may be 50,000 or more of these GCs.