Discovery of the Fomalhaut C debris disc

G.M. Kennedy, M.C. Wyatt, P. Kalas, G. Duchêne, B. Sibthorpe, J.-F. Lestrade, B.C. Matthews, J. Greaves

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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 and 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 (≳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 Ldisc/L = 1.2 × 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.

Original languageEnglish
Pages (from-to)L96-L100
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Early online date17 Dec 2013
Publication statusPublished - 11 Feb 2014


  • Binaries: general
  • Circumstellar matter
  • Stars: individual: AT Mic
  • Stars: individual: Fomalhaut
  • Stars: individual: LP 876−10
  • Stars: individual: TW PsA


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