We report precise Doppler measurements of seven subgiants from Keck Observatory .
All seven stars show variability in their radial velocities consistent with planet–mass companions in Keplerian orbits .
The host stars have masses ranging from 1.1 \leq M _ { \star } / M _ { \odot } \leq 1.9 , radii 3.4 \leq R _ { \star } / R _ { \odot } \leq 6.1 , and metallicities -0.21 \leq [ Fe/H ] \leq + 0.26 .
The planets are all more massive than Jupiter ( M _ { P } \sin i~ { } > 1 M _ { Jup } ) and have semimajor axes a > 1 AU .
We present millimagnitude photometry from the T3 0.4 m APT at Fairborn observatory for five of the targets .
Our monitoring shows these stars to be photometrically stable , further strengthening the interpretation of the observed radial velocity variability .
The orbital characteristics of the planets thus far discovered around former A-type stars are very different from the properties of planets around dwarf stars of spectral type F , G and K , and suggests that the formation and migration of planets is a sensitive function of stellar mass .
Three of the planetary systems show evidence of long-term , linear trends indicative of additional distant companions .
These trends , together with the high planet masses and increased occurrence rate , indicate that A-type stars are very promising targets for direct imaging surveys .