Pumping the eccentricity of exoplanets by tidal effect

Abstract

Planets close to their host stars are believed to undergo significant tidal interactions, leading to a progressive damping of the orbital eccentricity. Here we show that, when the orbit of the planet is excited by an outer companion, tidal effects combined with gravitational interactions may give rise to a secular increasing drift on the eccentricity. As long as this secular drift counterbalances the damping effect, the eccentricity can increase to high values. This mechanism may explain why some of the moderate close-in exoplanets are observed with substantial eccentricity values.

5 pages, 1 figure, accepted for publication in ApJL

References in corpus (4)

• Long-term tidal evolution of short-period planets with companions
• Tidal evolution of hierarchical and inclined systems
• Explicit expansion of the three-body disturbing function for arbitrary eccentricities and inclinations
• Long-term evolution of the spin of Mercury I. Effect of the obliquity and core-mantle friction

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