Vaidehi S. Paliya et al 2015 ApJ 811 143

The blazar Mrk 421 flared in 2013 with the fastest variability ever recorded for it. This may have been caused by magnetic energy dissipation and reconnection in a fast-moving region within the jet.

L. Testi et al 2015 ApJ 812 L38

The protoplanetary disk around HL Tau, shown by ALMA to have gaps, was searched for point sources corresponding to planets. None were found, setting upper limits to possible planet masses.

Shin Toriumi et al 2015 ApJ 811 137

Analysis of a light bridge that divides a sunspot into smaller regions shows that magnetoconvective evolution within the bridge drives local chromospheric brightening and dark surges.

Song Wang et al 2015 ApJ 812 L34

The ultraluminous X-ray source (ULX) M82-X1 may be a black hole being fed by a supergiant, based on the candidate optical counterparts discovered using HST.

Alexander Rudy et al 2015 ApJ 811 24

Multiwavelength observations of the inner knot of the Crab Nebula, a candidate site for gamma-ray flares, show that its intrinsic properties correlate with its projected separation from the pulsar.

Juliette C. Becker et al 2015 ApJ 812 L18

The discovery of two additional transiting planets around WASP-47, which is already known to host two hot Jupiters, makes this system a Rosetta stone for understanding transit timing variations.