摘要：Hot Jupiters (HJs), gas giant planets orbiting their host stars with periods on the order of days, commonly occur inthe Galaxy, including relatively massive (1.6–2.4 M e , i.e., A-type main-sequence stars) and evolved stars. Themajority of A-type main-sequence stars have stellar binary companions, that can strongly affect the dynamicalevolution of planets around either star. In this work, we investigate the effects of gravitational perturbations by a faraway stellar companion on the orbital evolution of gas giant planets orbiting A-type stars, the so-called EccentricKozai–Lidov mechanism, including the effects of general relativity, post-main-sequence stellar evolution, andtides. We find that only 0.15% of A-type stars will host HJs during their main-sequence lifetimes. However, wealso find a new class of planets, Temporary Hot Jupiters (THJs), that form during the post-main-sequence lifetimeof about 3.7% of former A-type main-sequence stars. These THJs orbit on periods of tens to a hundred days andonly exist for a few 100,000 years before they are engulfed, but they reach similar temperatures as “classical” HJsdue to the increased stellar luminosities. THJs’ spin–orbit angles will mostly be misaligned. THJ effects on the hoststars’ evolution could also be observable for longer than a few 100,000 years. Overall, we find that approximately70% of all gas giant planets orbiting A-type stars will eventually be destroyed or engulfed by their star, about 25%during the main-sequence lifetime, about 45% during post-main-sequence evolution.
关键词：binaries: general;planets and satellites: dynamical evolution and stability;stars: evolution;stars: kinematics and dynamics
