Chan-Kao Chang et al. 2015 ApJS 219 27

This survey by the intermediate Palomar Transient Factory measured the rotation periods of 1438 asteroids. The observations included the discovery of a new large super-fast rotator.

Roman A. Krivonos et al. 2015 ApJ 809 140

Observations of X-ray pulsar 2RXP J130159.6–635806 suggest it has undergone strong and steady spin-up for the last 20 years, likely as a result of long-term mass accretion.

Nickolas Moeckel and Andreas Burkert 2015 ApJ 807 67

Spatially distinct regions can masquerade as coherent star-forming filaments both in projected appearance and velocity diagnostics.

Alejandro Núñez et al. 2015 ApJ 809 161

This study of stellar rotation and activity at 500 Myr, using an extensive sample of stars from the open cluster M37, will help to calibrate the stellar age-rotation–activity relation.

Jeffrey D. P. Kenney et al. 2015 AJ 150 59

HST observations of spiral galaxy NGC 4921 reveal how ram pressure strips the ISM from its disk and suggest that magnetic fields help bind the dense gas clouds to the lower-density gas.

Kyoung-Sun Lee et al. 2015 ApJ 809 114

A study of the elemental composition of polar jets on the Sun shows that they have photospheric abundances, similar to those of the fast solar wind.