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The unstable fate of the planet orbiting the A star in the HD 131399 triple stellar system

Veras, Dimitri; Mustill, A.~J. LU and Gänsicke, B.~T. (2017) In Monthly Notices of the Royal Astronomical Society 465. p.1499-1504
Abstract
Validated planet candidates need not lie on long-term stable orbits, and instability triggered by post-main-sequence stellar evolution can generate architectures which transport rocky material to white dwarfs, hence polluting them. The giant planet HD 131399Ab orbits its parent A star at a projected separation of about 50-100 au. The host star, HD 131399A, is part of a hierarchical triple with HD 131399BC being a close binary separated by a few hundred au from the A star. Here, we determine the fate of this system, and find the following: (i) Stability along the main sequence is achieved only for a favourable choice of parameters within the errors. (ii) Even for this choice, in almost every instance, the planet is ejected during the... (More)
Validated planet candidates need not lie on long-term stable orbits, and instability triggered by post-main-sequence stellar evolution can generate architectures which transport rocky material to white dwarfs, hence polluting them. The giant planet HD 131399Ab orbits its parent A star at a projected separation of about 50-100 au. The host star, HD 131399A, is part of a hierarchical triple with HD 131399BC being a close binary separated by a few hundred au from the A star. Here, we determine the fate of this system, and find the following: (i) Stability along the main sequence is achieved only for a favourable choice of parameters within the errors. (ii) Even for this choice, in almost every instance, the planet is ejected during the transition between the giant branch and white dwarf phases of HD 131399A. This result provides an example of both how the free-floating planet population may be enhanced by similar systems and how instability can manifest in the polluted white dwarf progenitor population. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
methods: numerical, celestial mechanics, minor planets, asteroids: general, protoplanetary discs, white dwarfs
in
Monthly Notices of the Royal Astronomical Society
volume
465
pages
6 pages
publisher
Wiley-Blackwell
external identifiers
  • wos:000393785500015
ISSN
1365-2966
DOI
10.1093/mnras/stw2821
language
English
LU publication?
yes
id
73d173a5-dcdc-4ec7-821b-51c3d82a6b52
date added to LUP
2017-02-14 12:15:14
date last changed
2017-09-18 11:38:43
@article{73d173a5-dcdc-4ec7-821b-51c3d82a6b52,
  abstract     = {Validated planet candidates need not lie on long-term stable orbits, and instability triggered by post-main-sequence stellar evolution can generate architectures which transport rocky material to white dwarfs, hence polluting them. The giant planet HD 131399Ab orbits its parent A star at a projected separation of about 50-100 au. The host star, HD 131399A, is part of a hierarchical triple with HD 131399BC being a close binary separated by a few hundred au from the A star. Here, we determine the fate of this system, and find the following: (i) Stability along the main sequence is achieved only for a favourable choice of parameters within the errors. (ii) Even for this choice, in almost every instance, the planet is ejected during the transition between the giant branch and white dwarf phases of HD 131399A. This result provides an example of both how the free-floating planet population may be enhanced by similar systems and how instability can manifest in the polluted white dwarf progenitor population. },
  author       = {Veras, Dimitri and Mustill, A.~J. and Gänsicke, B.~T.},
  issn         = {1365-2966},
  keyword      = {methods: numerical,celestial mechanics,minor planets,asteroids: general,protoplanetary discs,white dwarfs},
  language     = {eng},
  month        = {02},
  pages        = {1499--1504},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The unstable fate of the planet orbiting the A star in the HD 131399 triple stellar system},
  url          = {http://dx.doi.org/10.1093/mnras/stw2821},
  volume       = {465},
  year         = {2017},
}