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Two transiting planets have been identified orbiting K2 target EPIC220674823. One object is an ultra-short-period planet (USP) with a period ofjust 0.57 days (13.7 hours), while the other has a period of 13.3 days. Bothplanets are small, with the former having a radius of R_p1=1.5 R_E and thelatter R_p2=2.5 R_E. Follow-up observations, including radial velocity (withuncertainties of 110 m/s) and high-resolution adaptive optics imagery, show nosigns of stellar companions. EPIC 220674823 is the 12th confirmed or validatedplanetary system in which an ultra-short-period planet (i.e., having an orbitalperiod less than 1 day) is accompanied by at least one additional planet,suggesting that such systems may be common and must be accounted for in modelsfor the formation and evolution of such extreme systems.

Ultra Short Period Planets in K2 with companions: a double transiting system for EPIC 220674823