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We analyze data from the Quarter 1-17 Data Release 24 (Q1--Q17 DR24) planetcandidate catalog from NASA's Kepler mission, specifically comparing systemswith single transiting planets to systems with multiple transiting planets, andidentify a distinct population of exoplanets with a necessarily distinct systemarchitecture. Such an architecture likely indicates a different branch in theirevolutionary past relative to the typical Kepler system. The key feature ofthese planetary systems is an isolated, Earth-sized planet with a roughlyone-day orbital period. We estimate that at least 24 of the 144 systems weexamined (>~17%) are members of this population. Accounting for detectionefficiency, such planetary systems occur with a frequency similar to the hotJupiters.

A population of planetary systems characterized by short-period, Earth-sized planets