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We report the detection of eighteen Jovian planets discovered as part of ourDoppler survey of subgiant stars at Keck Observatory, with follow-up Dopplerand photometric observations made at McDonald and Fairborn Observatories,respectively. The host stars have masses 0.927 < Mstar /Msun < 1.95, radii 2.5< Rstar/Rsun < 8.7, and metallicities -0.46 < [Fe/H] < +0.30. The planets haveminimum masses 0.9 MJup < MP sin i <3 MJup and semima jor axes a > 0.76 AU.These detections represent a 50% increase in the number of planets known toorbit stars more massive than 1.5 Msun and provide valuable additionalinformation about the properties of planets around stars more massivethantheSun.

Retired A Stars and Their Companions: Eighteen New Jovian Planets