Pumping the eccentricity of exoplanets by tidal effect

Details Pumping the eccentricity of exoplanets by tidal effect Pumping the eccentricity of exoplanets by tidal effect

2011-11-23

arxiv.org/abs/1111.5486v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

5 pages, 1 figure, accepted for publication in ApJL

Scientific paper

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.

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