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We report the discovery of a multi-planetary system transiting the M0 V dwarfHD 260655 (GJ 239, TOI-4599). The system consists of at least two transitingplanets, namely HD 260655 b, with a period of 2.77 d, a radius of R$_b$ =1.240$\pm$0.023 R$_\oplus$, a mass of M$_b$ = 2.14$\pm$0.34 M$_\oplus$, and abulk density of $\rho_b$ = 6.2$\pm$1.0 g cm$^{-3}$, and HD 260655 c, with aperiod of 5.71 d, a radius of R$_c$ = 1.533$^{+0.051}_{-0.046}$ R$_\oplus$, amass of M$_c$ = 3.09$\pm$0.48 M$_\oplus$, and a bulk density of $\rho_c$ =4.7$^{+0.9}_{-0.8}$ g cm$^{-3}$. The planets were detected in transit by theTESS mission and confirmed independently with archival and new precise radialvelocities obtained with the HIRES and CARMENES instruments since 1998 and2016, respectively. At a distance of 10 pc, HD 260655 becomes the fourthclosest known multi-transiting planet system after HD 219134, LTT 1445 A, andAU Mic. Due to the apparent brightness of the host star (J = 6.7 mag), bothplanets are among the most suitable rocky worlds known today for atmosphericstudies with the JWST, both in transmission and emission.

The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc