High resolution spectroscopic obs. of TOI-6255

With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine the planet's mass to be 1.44+/-0.14M_{Earth}_. The planet is just outside the Roche limit, with P_orb_/P_Roche_=1.13+/-0.10.

The strong tidal force likely deforms the planet into a triaxial ellipsoid with a long axis that is ~10% longer than the short axis. Assuming a reduced stellar tidal quality factor Q_*_^'^~10^7^, we predict that tidal orbital decay will cause TOI-6255 to reach the Roche limit in roughly 400Myr. Such tidal disruptions may produce the possible signatures of planet engulfment that have been seen on stars with anomalously high refractory elemental abundances compared to their conatal binary companions.