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Discovery of the Fomalhaut C debris disc

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Greaves_2014_MNRAS_Discovery.pdf (621.3Kb)
Date
11/02/2014
Author
Kennedy, G.M.
Wyatt, M.C.
Kalas, P.
Duchêne, G.
Sibthorpe, B.
Lestrade, J.-F.
Matthews, B.C.
Greaves, J.
Funder
Science & Technology Facilities Council
Grant ID
ST/J001651/1
Keywords
Binaries: general
Circumstellar matter
Stars: individual: AT Mic
Stars: individual: Fomalhaut
Stars: individual: LP 876−10
Stars: individual: TW PsA
QB Astronomy
QC Physics
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Abstract
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.
Citation
Kennedy , G M , Wyatt , M C , Kalas , P , Duchêne , G , Sibthorpe , B , Lestrade , J-F , Matthews , B C & Greaves , J 2014 , ' Discovery of the Fomalhaut C debris disc ' , Monthly Notices of the Royal Astronomical Society: Letters , vol. 438 , no. 1 , pp. L96-L100 . https://doi.org/10.1093/mnrasl/slt168
Publication
Monthly Notices of the Royal Astronomical Society: Letters
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnrasl/slt168
ISSN
1745-3925
Type
Journal article
Rights
© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Description
This work was supported by the European Union through ERC grant number 279973 (GMK & MCW). PK acknowledges support from NASA award NNX11AD21G, NSF award AST-0909188 and JPL/NASA award NMO711043.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5406

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