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We report the Transiting Exoplanet Survey Satellite (TESS) discovery of threeterrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- abright M dwarf at a distance of 10.6 pc. Using the Gaia-measured distance andbroad-band photometry we find that the host star is an M3 dwarf. Combined withthe TESS transits from three sectors, the corresponding stellar parametersyield planet radii ranging from 0.8REarth to 1.6REarth. All three planets haveshort orbital periods, ranging from 2.25 to 7.45 days with the outer pair justwide of a 2:1 period resonance. Diagnostic tests produced by the TESS DataValidation Report and the vetting package DAVE rule out common false positivesources. These analyses, along with dedicated follow-up and the multiplicity ofthe system, lend confidence that the observed signals are caused by planetstransiting L 98-59 and are not associated with other sources in the field. TheL 98-59 system is interesting for a number of reasons: the host star is bright(V = 11.7 mag, K = 7.1 mag) and the planets are prime targets for furtherfollow-up observations including precision radial-velocity mass measurementsand future transit spectroscopy with the James Webb Space Telescope; the nearresonant configuration makes the system a laboratory to study planetary systemdynamical evolution; and three planets of relatively similar size in the samesystem present an opportunity to study terrestrial planets where othervariables (age, metallicity, etc.) can be held constant. L 98-59 will beobserved in 4 more TESS sectors, which will provide a wealth of information onthe three currently known planets and have the potential to reveal additionalplanets in the system.

The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf