ON THE AGE AND BINARITY OF FOMALHAUT

@article{Mamajek2012ONTA,
  title={ON THE AGE AND BINARITY OF FOMALHAUT},
  author={Eric E. Mamajek},
  journal={The Astrophysical Journal Letters},
  year={2012},
  volume={754}
}
  • E. Mamajek
  • Published 27 June 2012
  • Geology, Physics
  • The Astrophysical Journal Letters
The nearby (d = 7.7 pc) A3V star Fomalhaut is orbited by a resolved dusty debris disk and a controversial candidate extrasolar planet. The commonly cited age for the system (200 ± 100 Myr) from Barrado y Navascues et al. relied on a combination of isochronal age plus youth indicators for the K4V common proper-motion system TW PsA. TW PsA is 1.°96 away from Fomalhaut and was first proposed as a companion by Luyten, but the physicality of the binarity is worth testing with modern data. I… 
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New HST data and modeling reveal a massive planetesimal collision around Fomalhaut
TLDR
It is found that Fomalhaut b has faded in brightness and grown in extent, with motion consistent with an escaping orbit, and suggestions that the source is a dispersing cloud of dust, produced by a massive collision between two planetesimals in an extrasolar planetary system are confirmed.
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