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Detectable close-in planets around white dwarfs through late unpacking
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Veras, Dimitri and Gaensicke, B. T. (2014) Detectable close-in planets around white dwarfs through late unpacking. Monthly Notices of the Royal Astronomical Society, 447 (2). pp. 1049-1058. doi:10.1093/mnras/stu2475 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stu2475
Abstract
Although 25–50 per cent of white dwarfs (WDs) display evidence for remnant planetary systems, their orbital architectures and overall sizes remain unknown. Vibrant close-in (≃1 R⊙) circumstellar activity is detected at WDs spanning many Gyr in age, suggestive of planets further away. Here we demonstrate how systems with 4 and 10 closely packed planets that remain stable and ordered on the main sequence can become unpacked when the star evolves into a WD and experience pervasive inward planetary incursions throughout WD cooling. Our full-lifetime simulations run for the age of the Universe and adopt main-sequence stellar masses of 1.5, 2.0 and 2.5 M⊙, which correspond to the mass range occupied by the progenitors of typical present-day WDs. These results provide (i) a natural way to generate an ever-changing dynamical architecture in post-main-sequence planetary systems, (ii) an avenue for planets to achieve temporary close-in orbits that are potentially detectable by transit photometry and (iii) a dynamical explanation for how residual asteroids might pollute particularly old WDs.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | Q Science > QC Physics | ||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
| Publisher: | Oxford University Press | ||||||||||
| ISSN: | 0035-8711 | ||||||||||
| Official Date: | 19 December 2014 | ||||||||||
| Dates: |
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| Volume: | 447 | ||||||||||
| Number: | 2 | ||||||||||
| Page Range: | pp. 1049-1058 | ||||||||||
| DOI: | 10.1093/mnras/stu2475 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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