TOI-771 RV datasets

We derive precise mass and radius for TOI-771 b, a super-Earth with R_b_=1.36+/-0.10R_{Earth}_ and M_b_=2.47+/-0.32M_{Earth}_ orbiting every 2.3 days around its host star. Its composition is consistent with an Earth-like planet, and it adds up to the rocky population of sub-Neptunes lying below the density gap identified around M dwarfs. With a 13% precision in mass, a 7% radius precision, and a warm equilibrium temperature of Teq=543K, TOI-771 b is a particularly interesting target for atmospheric characterisation with JWST, and it is indeed one of the targets under consideration for the Rocky World DDT program.

Additionally, we discover the presence of a second, non-transiting planet in the system, TOI-771 c, with a period of 7.61 days and a minimum mass of Mpsin(i)=2.87^+0.41^_-0.38_M_{Earth}_. Even though the inclination is not directly constrained, the planet likely belongs to the temperate sub-Neptune population, with an equilibrium temperature of 365K.