A Transiting Super-Earth in the Radius Valley and an Outer Planet Candidate Around HD 307842

Abstract We report the confirmation of a TESS-discovered transiting super-Earth planet orbiting mid-G star, HD 307842 (TOI-784). The has period 2.8 days, and radial velocity (RV) measurements constrain mass to be 9.67 − 0.82 + 0.83 M ⊕ . also discovery an additional candidate on outer orbit that is most likely nontransiting. possible periods are approximately 20–63 with corresponding RV semiamplitudes expected range from 3.2 5.4 m s −1 minimum masses 12.6 31.1 M ⊕ radius (planet b) ${1.93}_{-0.09}^{+0.11}\ {R}_{\oplus 1.93 0.09 0.11 R , which results in mean density ${7.4}_{-1.2}^{+1.4}\ {\rm{g}}\,{\mathrm{cm}}^{-3}$?> 7.4 1.2 1.4 g width="0.25em" cm 3 suggesting TOI-784 b rocky though it comparable sub-Neptune. found located at lower edge so-called “radius valley” versus insolation plane, consistent photoevaporation or core-powered mass-loss prediction. TESS data did not reveal any significant transit signal candidate, our analysis shows orbital inclinations ${88.60^\circ }_{-0.86}^{+0.84}$?> 88.60 ° 0.86 0.84 ≤88.°3–89.°2, respectively. More observations needed determine second object, search for planets this system.