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We announce the discovery of two planetary companions orbiting around the lowmass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). Thediscovery is based on the analysis of CARMENES radial velocity observations inthe visual channel as part of its survey for exoplanets around M dwarfs. In thecase of GJ 1265, CARMENES observations were complemented with publiclyavailable Doppler measurements from HARPS. The datasets reveal one planetarycompanion for each star that share very similar properties: minimum masses of$8.0\pm0.5$ M$_{\oplus}$ and $7.4\pm0.5$ M$_{\oplus}$ in low-eccentricityorbits with periods of $3.023\pm0.001$ d and $3.651\pm0.001$ d for GJ 3779 band GJ 1265 b, respectively. The periodic signals around three days found inthe radial velocity data have no counterpart in any spectral activityindicator. Besides, we collected available photometric data for the two hoststars, which confirm that the additional Doppler variations found at periodsaround 95 d can be attributed to the rotation of the stars. The addition ofthese planets in a mass-period diagram of known planets around M dwarfssuggests a bimodal distribution with a lack of short-period low-mass planets inthe range of 2-5 M$_{\oplus}$. It also indicates that super-Earths (> 5M$_{\oplus}$) currently detected by radial velocity and transit techniquesaround M stars are usually found in systems dominated by a single planet.

astronomy and astrophysics

The CARMENES search for exoplanets around M dwarfs: The warm  super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779)  and LP 819-052 (GJ 1265)