How Jupiters save or destroy inner Neptunes around evolved stars

MARÍA PAULA RONCO; SCHREIBER, MATTHIAS R.; GIUPPONE, CRISTIAN A.; VERAS, DIMITRI; JORGE CUADRA; OCTAVIO MIGUEL GUILERA

Congreso; 51 Virtual Anual Meeting of the DDA; 2020

In about 6 Giga years our Sun will evolve into a red giant and nally end its life as a white dwarf.This stellar metamorphosis will occur to virtually all known host stars of exo-planetary systems andis therefore crucial for their nal fate. It is clear that the innermost planets will be engulfed andevaporated during the giant phase and that planets located farther out will survive. However, thedestiny of planets in-between, at 1 􀀀 10 au, has not yet been investigated with a multi-planet tidaltreatment. We here combine for the rst time multi-planet interactions, stellar evolution, and tidaleects in an N-body code to study the evolution of a Neptune-Jupiter planetary system. We reportthat the fate of the Neptune-mass planet, located closer to the star than the Jupiter-mass planet, can bevery dierent from the fate of a single Neptune. The simultaneous eects of gravitational interactions,mass loss and tides can drive the planetary system towards mean motion resonances. Crossing theseresonances aects particularly the eccentricity of the Neptune and thereby also its fate, which can beengulfment, collision with the Jupiter-mass planet, ejection from the system, or survival at a largerseparation.