Discovery of the Fomalhaut C debris disc

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DOIResolve DOI: http://doi.org/10.1093/mnrasl/slt168
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society: Letters
ISSN1745-3925
Volume438
Issue1
PagesL96L100
AbstractFomalhaut 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. © 2013 The Authors.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270792
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Record identifier29b5890c-a420-419e-b136-9b10b1127c46
Record created2014-02-17
Record modified2016-05-09
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