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Full-lifetime simulations of multiple unequal-mass planets across all phases of stellar evolution
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Veras, Dimitri, Mustill, Alexander J., Gänsicke, B. T. (Boris T.), Redfield, Seth, Georgakarakos, Nikolaos, Bowler, Alex B. and Lloyd, Maximillian J. S. (2016) Full-lifetime simulations of multiple unequal-mass planets across all phases of stellar evolution. Monthly Notices of the Royal Astronomical Society, 458 (4). pp. 3942-3967. doi:10.1093/mnras/stw476
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Official URL: http://dx.doi.org/10.1093/mnras/stw476
Abstract
We know that planetary systems are just as common around white dwarfs as around main-sequence stars. However, self-consistently linking a planetary system across these two phases of stellar evolution through the violent giant branch poses computational challenges, and previous studies restricted architectures to equal-mass planets. Here, we remove this constraint and perform over 450 numerical integrations over a Hubble time (14 Gyr) of packed planetary systems with unequal-mass planets. We characterize the resulting trends as a function of planet order and mass. We find that intrusive radial incursions in the vicinity of the white dwarf become less likely as the dispersion amongst planet masses increases. The orbital meandering which may sustain a sufficiently dynamic environment around a white dwarf to explain observations is more dependent on the presence of terrestrial-mass planets than any variation in planetary mass. Triggering unpacking or instability during the white dwarf phase is comparably easy for systems of unequal-mass planets and systems of equal-mass planets; instabilities during the giant branch phase remain rare and require fine-tuning of initial conditions. We list the key dynamical features of each simulation individually as a potential guide for upcoming discoveries.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||
| Library of Congress Subject Headings (LCSH): | Satellites, White dwarf stars, Celestial mechanics, Asteroids | ||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
| Publisher: | Oxford University Press | ||||||||||
| ISSN: | 0035-8711 | ||||||||||
| Official Date: | 1 June 2016 | ||||||||||
| Dates: |
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| Volume: | 458 | ||||||||||
| Number: | 4 | ||||||||||
| Number of Pages: | 26 | ||||||||||
| Page Range: | pp. 3942-3967 | ||||||||||
| DOI: | 10.1093/mnras/stw476 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Funder: | European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), Knut and Alice Wallenberg Foundation, Sweden. Vetenskapsrådet [Research Council] | ||||||||||
| Grant number: | 320964 (FP7), KAW 2012.0150 (KAW), 2011-3991 (S.V) | ||||||||||
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