Fomalhaut is one of the most interesting and well studied nearby stars , hosting at least one planet , a spectacular debris ring , and two distant low-mass stellar companions ( TW PsA and LP 876-10 , a.k.a .
Fomalhaut B & C ) .
We observed both companions with Herschel , and while no disc was detected around the secondary , TW PsA , we have discovered the second debris disc in the Fomalhaut system , around LP 876-10 .
This detection is only the second case of two debris discs seen in a multiple system , both of which are relatively wide ( \gtrsim 3000 AU for HD 223352/40 and 158 kAU [ 0.77 pc ] for Fomalhaut/LP 876-10 ) .
The disc is cool ( 24K ) and relatively bright , with a fractional luminosity L _ { disc } / L _ { \star } = 1.2 \times 10 ^ { -4 } , and represents the rare observation of a debris disc around an M dwarf .
Further work should attempt to find if the presence of two discs in the Fomalhaut system is coincidental , perhaps simply due to the relatively young system age of 440 Myr , or if the stellar components have dynamically interacted and the system is even more complex than it currently appears .