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  WD 1856 b: a close giant planet around a white dwarf that could have survived a common envelope phase

Lagos, F., Schreiber, M. R., Zorotovic, M., Gänsicke, B. T., Ronco, M. P., & Hamers, A. S. (2020). WD 1856 b: a close giant planet around a white dwarf that could have survived a common envelope phase. Monthly Notices of the Royal Astronomical Society, 501(1), 676-682. doi:10.1093/mnras/staa3703.

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Lagos, F., Author
Schreiber, M. R., Author
Zorotovic, M., Author
Gänsicke, B. T., Author
Ronco, M. P., Author
Hamers, Adrian S.1, Author              
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1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: The discovery of a giant planet candidate orbiting the white dwarf WD 1856+534 with an orbital period of 1.4 d poses the questions of how the planet reached its current position. We here reconstruct the evolutionary history of the system assuming common envelope evolution as the main mechanism that brought the planet to its current position. We find that common envelope evolution can explain the present configuration if it was initiated when the host star was on the asymptotic giant branch, the separation of the planet at the onset of mass transfer was in the range 1.69–2.35 au, and if in addition to the orbital energy of the surviving planet either recombination energy stored in the envelope or another source of additional energy contributed to expelling the envelope. We also discuss the evolution of the planet prior to and following common envelope evolution. Finally, we find that if the system formed through common envelope evolution, its total age is in agreement with its membership to the Galactic thin disc. We therefore conclude that common envelope evolution is at least as likely as alternative formation scenarios previously suggested such as planet–planet scattering or Kozai–Lidov oscillations.

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 Dates: 2020-11-27
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa3703
Other: LOCALID: 3291559
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 501 (1) Sequence Number: - Start / End Page: 676 - 682 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150