Gijs D. Mulders et al 2016 AJ 152 187

A study of 20,000 Kepler stars shows that exoplanets with orbital periods of <10 days are preferentially found around metal-rich stars. The largest host metallicity difference is seen for hot, rocky planets.

Noemie Globus and David Eichler 2016 ApJL 833 L17

Changing an ultra high energy cosmic ray’s rigidity from a given source is shown to change the expected arrival direction, as does motion of the solar system through the interstellar medium.

Jaejin Shin et al 2016 ApJS 227 31

148 X-ray cavities were found in Chandra archive data, with similar detection rates among galaxy clusters, groups and individual galaxies. This suggests their formation is likely independent of environment.

Kevin M. Flaherty et al 2016 ApJ 833 104

~80% of the 30 young stellar objects observed by Spitzer in the Chamaeleon I cluster displayed variability on timescales of months, likely caused by structural or temperature fluctuations in the inner disk.

Daniel F. Evans et al 2016 ApJL 833 L19

WASP-20 has been discovered to be a close binary stellar system with a separation of ~60 AU, orbited by a transiting “hot Saturn” that has a ~5 day period.

Mercedes López-Morales et al 2016 AJ 152 204

An analysis of 82 new radial-velocity observations of Kepler-21, the brightest exoplanet host discovered by Kepler, show that Kepler-21b is a rocky exoplanet of roughly 5 times Earth’s mass.