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Analyzing Spitzer and Herschel archival measurements we identified a debrisdisk around the young K7/M0 star CP-72 2713. The system belongs to the 24Myrold $\beta$ Pic moving group. Our new 1.33mm continuum observation, obtainedwith the ALMA 7-m array, revealed an extended dust disk with a peak radius of140au, probably tracing the location of the planetesimal belt in the system.The disk is outstandingly large compared to known spatially resolved debrisdisks and also to protoplanetary disks around stars of comparable masses. Thedynamical excitation of the belt at this radius is found to be reconcilablewith planetary stirring, while self-stirring by large planetesimals embedded inthe belt can work only if these bodies form very rapidly, e.g. via pebbleconcentration. By analyzing the spectral energy distribution we derived acharacteristic dust temperature of 43K and a fractional luminosity of1.1$\times$10$^{-3}$. The latter value is prominently high, we know only fourother similarly dust-rich Kuiper-belt analogs within 40pc of the Sun.

The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group