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We report the discovery and characterization of a transiting warm sub-Neptuneplanet around the nearby bright ($V=8.75$ mag, $K=7.15$ mag) solar twin HD183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The hoststar is located $56.8\pm0.1$ pc away with a radius of $R_{\ast}=0.97\pm0.02\R_{\odot}$ and a mass of $M_{\ast}=1.03\pm0.05\ M_{\odot}$. We confirm theplanetary nature by combining space and ground-based photometry, spectroscopy,and imaging. We find that HD 183579b (TOI-1055b) has a radius of$R_{p}=3.53\pm0.13\ R_{\oplus}$ on a $17.47$ day orbit with a mass of$M_{p}=11.2\pm5.4\ M_{\oplus}$ ($3\sigma$ mass upper limit of $27.4\M_{\oplus}$). HD 183579b is the fifth brightest known sub-Neptune planet systemin the sky, making it an excellent target for future studies of the interiorstructure and atmospheric properties. By performing a line-by-line differentialanalysis using the high resolution and signal-to-noise ratio HARPS spectra, wefind that HD 183579 joins the typical solar twin sample, without astatistically significant refractory element depletion.

HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS