SIMBAD references

We report the discovery of a transiting planet first identified as a candidate in Sector 1 of the Transiting Exoplanet Survey Satellite (TESS), and then confirmed with precision radial velocities. HD 1397b has a mass of M_P=0.367_–0.023^+0.022M_J, a radius of R_P=1.023_–0.013^+0.013R_J, and orbits its bright host star (V = 7.8 mag) with an orbital period of 11.5366±0.0003 d on a moderately eccentric orbit (e=0.216_–0.026^+0.027). With a mass of M_*=1.257_–0.029^+0.029M_☉, a radius of R_*=2.341_–0.019^+0.022R_☉, and an age of 4.46±0.25 Gyr, the solar-metallicity host star has already departed from the main sequence. We find evidence in the radial velocity measurements of a secondary signal with a longer period. We attribute it to the rotational modulation of stellar activity, but a long-term radial velocity monitoring would be necessary to discard if this signal is produced by a second planet in the system. The HD 1397 system is among the brightest ones currently known to host a transiting planet, which will make it possible to perform detailed follow-up observations in order to characterize the properties of giant planets orbiting evolved stars.