GJ 724 and GJ 3988 RV timeseries

The minimum masses are 10.75^+0.96^_-0.87_ and 3.69^+0.42^_-0.41^ Earth-masses for GJ 724 b and GJ 3988 b, respectively. Both planets have short periods (P<10d) and, therefore, they orbit their star closely (a<0.05au). GJ 724 b has an eccentric orbit (e=0.577^+0.055^_-0.052_), whereas the orbit of GJ 3988 b is circular.

The high eccentricity of GJ 724 b makes it the most eccentric single exoplanet (to this date) around an M dwarf. Thus, we suggest a further analysis to understand its configuration in the context of planetary formation and architecture. In contrast, GJ 3988 b is an example of a common type of planet around mid-M dwarfs.