HARPS radial velocities of the host star HD15337

We combine the TESS photometry with archival High Accuracy Radial velocity Planet Searcher spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets.

With an orbital period of 4.8d, a mass of 7.51_-1.01^+1.09^M{Earth}_ and a radius of 1.64+/-0.06R_{Earth}_, HD15337b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD15337c has an orbital period of 17.2d, a mass of 8.11_-1.69_^+1.82^M_{Earth}_, and a radius of 2.39+/-0.12R_{Earth}_, suggesting that the planet might be surrounded by a thick atmospheric envelope.