An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561

Lacedelli, G

;Malavolta, L;Borsato, L;Piotto, G;Nardiello, D;Mortier, A;Stalport, M;Collier ;Cameron, A;Poretti, E;Buchhave, L A;López-Morales, M;Nascimbeni, V;Wilson, T G;Udry, S;Latham, D W;Bonomo, A S;Damasso, M;Dumusque, X;Jenkins, J M;Lovis, C;Rice, K;Sasselov, D;Winn, J N;Andreuzzi, G;Cosentino, R;Charbonneau, D;Di ;Fabrizio, L;Martnez ;Fiorenzano, A F;Ghedina, A;Harutyunyan, A;Lienhard, F;Micela, G;Molinari, E;Pagano, I;Pepe, F;Phillips, D F;Pinamonti, M;Ricker, G;Scandariato, G;Sozzetti, A;Watson, C A

2021