TOI-5108 and TOI 5786 radial velocities

We estimate hydrogen-helium envelope mass fractions of 38% for TOI-5108 b and 74% for TOI-5786 b. However, using a model for the interior structure that includes tidal effects the envelope fraction of TOI-5108 b could be much lower (~20$) depending on the obliquity. We estimate mass-loss rates between 1.0x10^9^g/s and 9.8x10^9^g/s for TOI-5108 b and between 3.6x10^8^g/s and 3.5x10^9^g/s for TOI-5786 b.

Given their masses, this means that both planets are stable against photoevaporation. Furthermore, at these mass-loss rates, there is likely no detectable signal in the metastable helium triplet with the James Webb Space Telescope. We also detect a transit signal for a second planet candidate around TOI-5786 with a period of 6.998 days and a radius of 3.90+/-0.16R_{Earth}_ Using our RV data and photodynamical modeling, we are able to provide a 3-{sigma} upper limit of 26.5M_{Earth}_ for the mass of the potential inner companion to TOI-5786 b.