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New HST data and modeling reveal a massive planetesimal collision around Fomalhaut

Gáspár, András ; Rieke, George H.

Proceedings of the National Academy of Sciences - PNAS, 2020-05, Vol.117 (18), p.9712-9722 [Periódico revisado por pares]

United States: National Academy of Sciences

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  • Título:
    New HST data and modeling reveal a massive planetesimal collision around Fomalhaut
  • Autor: Gáspár, András ; Rieke, George H.
  • Assuntos: Extrasolar planets ; Gravitational effects ; Gravity ; Hubble Space Telescope ; Hypothetical planets ; Modelling ; Orbital mechanics ; Physical Sciences ; Planet formation ; Planetary evolution ; Planetary orbits ; Planetary systems ; Space telescopes ; Stellar evolution
  • É parte de: Proceedings of the National Academy of Sciences - PNAS, 2020-05, Vol.117 (18), p.9712-9722
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    Author contributions: A.G. and G.H.R. designed research; A.G. performed research; A.G. contributed analytic tools; A.G. analyzed data; and A.G. and G.H.R. wrote the paper.
    Edited by Neta A. Bahcall, Princeton University, Princeton, NJ, and approved January 15, 2020 (received for review July 19, 2019)
  • Descrição: The apparent detection of an exoplanet orbiting Fomalhaut was announced in 2008. However, subsequent observations of Fomalhaut b raised questions about its status: Unlike other exoplanets, it is bright in the optical and nondetected in the infrared, and its orbit appears to cross the debris ring around the star without the expected gravitational perturbations. We revisit previously published data and analyze additional Hubble Space Telescope (HST) data, finding that the source is likely on a radial trajectory and has faded and become extended. Dynamical and collisional modeling of a recently produced dust cloud yields results consistent with the observations. Fomalhaut b appears to be a directly imaged catastrophic collision between two large planetesimals in an extrasolar planetary system. Similar events should be very rare in quiescent planetary systems of the age of Fomalhaut, suggesting that we are possibly witnessing the effects of gravitational stirring due to the orbital evolution of hypothetical planet(s) around the star.
  • Editor: United States: National Academy of Sciences
  • Idioma: Inglês
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