HATS-59b,c: A Transiting Hot Jupiter and a Cold Massive Giant Planet around a Sun-like Star

摘要

We report the first discovery of a multi-planetary system by the HATSouth network, HATS-59b,c, a planetary system with an inner transiting hot Jupiter and an outer cold massive giant planet, which was detected via radial velocity. The inner transiting planet, HATS-59b, is on an eccentric orbit with e 0.129 0.049 = ? , orbiting a V 13.951 0.030 = ? mag solar-like star ( M ? = 1.038 0.039 ? M ☉ and R R 1.036 0.067 =☉ ) with a period of 5.416081 0.000016 ? days. The outer companion, HATS-59c is on a circular orbit with m i sin 12.70 = 0.87 M J and a period of 1422?±?14 days. The inner planet has a mass of 0.806 0.069 ? M J and a radius of 1.126 0.077 ? R J , yielding a density of 0.70 0.16 ? g cm 3 - . Unlike most planetary systems that include only a single hot Jupiter, HATS-59b,c includes, in addition to the transiting hot Jupiter, a massive outer companion. The architecture of this system is valuable for understanding planet migration.