Planetary Orbit Eccentricity Trends (POET). I. The Eccentricity-Metallicity Trend for Small Planets Revealed by the LAMOST-Gaia-Kepler Sample.

In the first paper of the POET, we found that, in single transiting systems, the eccentricity of small planets increases with stellar metallicity. Our results are consistent with RV.  Furthermore, we identified two mechanisms (self-excitation and external excitation) that could potentially explain the observed eccentricity–metallicity trend.