An ultra-short-period super-Earth with an extremely high density and an outer companion 由 Livingston, JH, Gandolfi, D, Trani, AA, Herath, M, Barragán, O, Hatzes, A, Luque, R, Fukui, A, Nowak, G, Palle, E, Hellier, C, Fridlund, M, de Leon, J, Hirano, T, Narita, N, Albrecht, S, Dai, F, Deeg, H, Van Eylen, V, Korth, J, Tamura, M