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The unstable fate of the planet orbiting the A-star in the HD 131399 triple stellar system
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Veras, Dimitri, Mustill, Alexander and Gänsicke, B. T. (Boris T.) (2016) The unstable fate of the planet orbiting the A-star in the HD 131399 triple stellar system. Monthly Notices of the Royal Astronomical Society, 465 (2). pp. 1499-1504.
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Official URL: https://doi.org/10.1093/mnras/stw2821
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, polluting them. The giant planet HD 131399Ab orbits its parent A star at a projected separation of about 50-100 au. The host star, HD131399A, is part of a hierarchical triple with HD131399BC being a close binary separated by a few hundred au from the A star. Here, we determine the fate of this system, and find that (i) stability along the main sequence is achieved only for a favourable choice of parameters within the errors, and (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.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Asteroids, White dwarf stars, Celestial mechanics | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 0035-8711 | ||||||||
| Official Date: | 3 November 2016 | ||||||||
| Dates: |
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| Volume: | 465 | ||||||||
| Number: | 2 | ||||||||
| Page Range: | pp. 1499-1504 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | Seventh Framework Programme (European Commission) (FP7), Knut och Alice Wallenbergs Stiftelse (Sweden) | ||||||||
| Grant number: | (FP/2007-2013) / ERC Grant Agreement n. 320964 (WDTracer) | ||||||||
| Open Access Version: |
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