Kedron Silsbee and Roman R. Rafikov 2015 ApJ 808 58
These calculations suggest Kepler-discovered planets circling binary star systems on ~1AU orbits likely didn’t form in situ, but instead formed further out and migrated in to where they are now.
Andrea Kunder et al. 2015 ApJ 808 L12
An abnormally high-velocity RR Lyrae star near the Galactic bulge might be a Galactic halo interloper. This suggests additional halo contamination might exist in the bulge RR Lyrae sample.
Kevin J. Walsh and Harold F. Levison 2015 AJ 150 11
Simulations of the formation of Pluto’s moons demonstrate collisions could knock debris outward in the system, addressing the problem of why Pluto’s outer moons are unexpectedly far from Pluto and Charon.
Michael J. Koss et al. 2015 ApJ 807 149
NuSTAR and Chandra observations show that the core of NGC 3393, previously reported to be a dual AGN with the smallest known separation, may actually be a single AGN with a two-sided jet.
Robert H. Tyler et al. 2015 ApJS 218 22
Models of the tidal heating of Jupiter’s moon Io that include a magma ocean just below its surface suggest that including both solid and fluid tidal responses is important for matching observations.
Alexander J. Mustill et al. 2015 ApJ 808 14
In systems with Hot Jupiters, low-mass planets aren’t observed close to the host star. Hot Jupiters may clear all the low-mass inner planets out of the system as their orbits circularize.