K2-137 b: an Earth-sized planet in a 4.3-hour orbit around an M-dwarf

A. M. S. Smith, J. Cabrera, Sz. Csizmadia +34

We report the discovery from K2 of a transiting terrestrial planet in an ultra-short-period orbit around an M3-dwarf. K2-137 b completes an orbit in only 4.3 hours, the second-shor…